diff --git a/habitica-images b/habitica-images
index e3215f16f9..aa72332019 160000
--- a/habitica-images
+++ b/habitica-images
@@ -1 +1 @@
-Subproject commit e3215f16f99f9e33bf218b46862d6b2ad9bd7fec
+Subproject commit aa723320199d7f03ce749d431b46e8d7f95cc8de
diff --git a/package.json b/package.json
index 12972f46c4..4337c31920 100644
--- a/package.json
+++ b/package.json
@@ -29,9 +29,9 @@
     "eslint": "^8.55.0",
     "eslint-config-habitrpg": "^6.2.3",
     "eslint-plugin-mocha": "^5.0.0",
-    "express": "^4.21.1",
+    "express": "5.1.0",
     "express-basic-auth": "^1.2.1",
-    "express-validator": "^5.2.0",
+    "express-validator": "7.2.1",
     "firebase-admin": "^12.1.1",
     "glob": "^8.1.0",
     "got": "^11.8.6",
diff --git a/website/server/controllers/api-v3/auth.js b/website/server/controllers/api-v3/auth.js
index 70c065a041..fb5f970120 100644
--- a/website/server/controllers/api-v3/auth.js
+++ b/website/server/controllers/api-v3/auth.js
@@ -3,6 +3,7 @@ import moment from 'moment';
 import pick from 'lodash/pick';
 import sortBy from 'lodash/sortBy';
 import nconf from 'nconf';
+import { body , validationResult } from 'express-validator';
 import {
   authWithHeaders,
 } from '../../middlewares/auth';
@@ -87,8 +88,8 @@ api.loginLocal = {
         errorMessage: res.t('missingPassword'),
       },
     });
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     req.sanitizeBody('username').trim();
     req.sanitizeBody('password').trim();
@@ -216,8 +217,8 @@ api.updateUsername = {
       },
     });
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const newUsername = req.body.username;
 
@@ -307,7 +308,7 @@ api.updatePassword = {
       },
     });
 
-    const validationErrors = req.validationErrors();
+    const validationErrors = validationResult(req).array();
 
     if (validationErrors) {
       throw validationErrors;
@@ -353,8 +354,8 @@ api.resetPassword = {
         notEmpty: { errorMessage: res.t('missingEmail') },
       },
     });
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const email = req.body.email.toLowerCase();
     let user = await User.findOne(
@@ -419,12 +420,12 @@ api.updateEmail = {
 
     if (!user.auth.local.email) throw new BadRequest(res.t('userHasNoLocalRegistration'));
 
-    req.checkBody('newEmail', res.t('newEmailRequired')).notEmpty().isEmail();
+    await body('newEmail', res.t('newEmailRequired')).notEmpty().isEmail().run(req)
     if (user.auth.local.hashed_password) {
-      req.checkBody('password', res.t('missingPassword')).notEmpty();
+      await body('password', res.t('missingPassword')).notEmpty().run(req)
     }
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const emailAlreadyInUse = await User.findOne({
       'auth.local.email': req.body.newEmail.toLowerCase(),
@@ -485,8 +486,8 @@ api.resetPasswordSetNewOne = {
       },
     });
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { newPassword, confirmPassword } = req.body;
 
diff --git a/website/server/controllers/api-v3/challenges.js b/website/server/controllers/api-v3/challenges.js
index ba9c411bf5..c190924150 100644
--- a/website/server/controllers/api-v3/challenges.js
+++ b/website/server/controllers/api-v3/challenges.js
@@ -4,6 +4,7 @@ import merge from 'lodash/merge';
 import pick from 'lodash/pick';
 import reduce from 'lodash/reduce';
 import times from 'lodash/times';
+import { body, param, query , validationResult } from 'express-validator';
 import { authWithHeaders, authWithSession } from '../../middlewares/auth';
 import { model as Challenge } from '../../models/challenge';
 import bannedWords from '../../libs/bannedWords';
@@ -232,11 +233,11 @@ api.createChallenge = {
   async handler (req, res) {
     const { user } = res.locals;
 
-    req.checkBody('group', apiError('groupIdRequired')).notEmpty();
-    req.checkBody('summary', apiError('summaryLengthExceedsMax')).isLength({ max: MAX_SUMMARY_SIZE_FOR_CHALLENGES });
+    await body('group', apiError('groupIdRequired')).notEmpty().run(req)
+    await body('summary', apiError('summaryLengthExceedsMax')).isLength({ max: MAX_SUMMARY_SIZE_FOR_CHALLENGES }).run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const group = await Group.getGroup({
       user, groupId: req.body.group, fields: basicGroupFields, optionalMembership: true,
@@ -328,10 +329,10 @@ api.joinChallenge = {
   async handler (req, res) {
     const { user } = res.locals;
 
-    req.checkParams('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID();
+    await param('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID().run(req);
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const challenge = await Challenge.findOne({ _id: req.params.challengeId }).exec();
     if (!challenge) throw new NotFound(res.t('challengeNotFound'));
@@ -397,10 +398,10 @@ api.leaveChallenge = {
     const { user } = res.locals;
     const keep = req.body.keep === 'remove-all' ? 'remove-all' : 'keep-all';
 
-    req.checkParams('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID();
+    await param('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID().run(req);
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const challenge = await Challenge.findOne({ _id: req.params.challengeId }).exec();
     if (!challenge) throw new NotFound(res.t('challengeNotFound'));
@@ -463,10 +464,10 @@ api.getUserChallenges = {
   url: '/challenges/user',
   middlewares: [authWithHeaders()],
   async handler (req, res) {
-    req.checkQuery('page').notEmpty().isInt({ min: 0 }, apiError('queryPageInteger'));
+    await query('page').notEmpty().isInt({ min: 0 }, apiError('queryPageInteger')).run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const CHALLENGES_PER_PAGE = 10;
     const {
@@ -599,10 +600,10 @@ api.getGroupChallenges = {
     const { user } = res.locals;
     let { groupId } = req.params;
 
-    req.checkParams('groupId', apiError('groupIdRequired')).notEmpty();
+    await param('groupId', apiError('groupIdRequired')).notEmpty().run(req);
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     if (groupId === 'party') groupId = user.party._id;
     if (groupId === 'habitrpg') groupId = TAVERN_ID;
@@ -661,10 +662,10 @@ api.getChallenge = {
   url: '/challenges/:challengeId',
   middlewares: [authWithHeaders()],
   async handler (req, res) {
-    req.checkParams('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID();
+    await param('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID().run(req);
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { user } = res.locals;
     const { challengeId } = req.params;
@@ -719,10 +720,10 @@ api.exportChallengeCsv = {
   url: '/challenges/:challengeId/export/csv',
   middlewares: [authWithSession],
   async handler (req, res) {
-    req.checkParams('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID();
+    await param('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID().run(req);
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { user } = res.locals;
     const { challengeId } = req.params;
@@ -836,11 +837,11 @@ api.updateChallenge = {
   url: '/challenges/:challengeId',
   middlewares: [authWithHeaders()],
   async handler (req, res) {
-    req.checkParams('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID();
-    req.checkBody('summary', apiError('summaryLengthExceedsMax')).isLength({ max: MAX_SUMMARY_SIZE_FOR_CHALLENGES });
+    await param('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID().run(req);
+    await body('summary', apiError('summaryLengthExceedsMax')).isLength({ max: MAX_SUMMARY_SIZE_FOR_CHALLENGES }).run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { user } = res.locals;
     const { challengeId } = req.params;
@@ -883,10 +884,10 @@ api.deleteChallenge = {
   async handler (req, res) {
     const { user } = res.locals;
 
-    req.checkParams('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID();
+    await param('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID().run(req);
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const challenge = await Challenge.findOne({ _id: req.params.challengeId }).exec();
     if (!challenge) throw new NotFound(res.t('challengeNotFound'));
@@ -931,11 +932,11 @@ api.selectChallengeWinner = {
   async handler (req, res) {
     const { user } = res.locals;
 
-    req.checkParams('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID();
-    req.checkParams('winnerId', res.t('winnerIdRequired')).notEmpty().isUUID();
+    await param('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID().run(req);
+    await param('winnerId', res.t('winnerIdRequired')).notEmpty().isUUID().run(req);
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const challenge = await Challenge.findOne({ _id: req.params.challengeId }).exec();
     if (!challenge) throw new NotFound(res.t('challengeNotFound'));
@@ -992,10 +993,10 @@ api.cloneChallenge = {
   async handler (req, res) {
     const { user } = res.locals;
 
-    req.checkParams('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID();
+    await param('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID().run(req);
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const challengeToClone = await Challenge.findOne({ _id: req.params.challengeId }).exec();
     if (!challengeToClone) throw new NotFound(res.t('challengeNotFound'));
@@ -1061,10 +1062,10 @@ api.flagChallenge = {
   async handler (req, res) {
     const { user } = res.locals;
 
-    req.checkParams('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID();
+    await param('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID().run(req);
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const challenge = await Challenge.findOne({ _id: req.params.challengeId }).exec();
     if (!challenge) throw new NotFound(res.t('challengeNotFound'));
@@ -1094,10 +1095,10 @@ api.clearFlagsChallenge = {
   async handler (req, res) {
     const { user } = res.locals;
 
-    req.checkParams('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID();
+    await param('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID().run(req);
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     if (!user.hasPermission('moderator')) {
       throw new NotAuthorized(res.t('messageGroupChatAdminClearFlagCount'));
diff --git a/website/server/controllers/api-v3/coupon.js b/website/server/controllers/api-v3/coupon.js
index 4b92178c57..ceaa991a15 100644
--- a/website/server/controllers/api-v3/coupon.js
+++ b/website/server/controllers/api-v3/coupon.js
@@ -1,5 +1,6 @@
 import _ from 'lodash';
 import couponCode from 'coupon-code';
+import { param, query , validationResult } from 'express-validator';
 import csvStringify from '../../libs/csvStringify';
 import {
   authWithHeaders,
@@ -72,11 +73,11 @@ api.generateCoupons = {
   url: '/coupons/generate/:event',
   middlewares: [authWithHeaders(), ensurePermission('coupons')],
   async handler (req, res) {
-    req.checkParams('event', apiError('eventRequired')).notEmpty();
-    req.checkQuery('count', apiError('countRequired')).notEmpty().isNumeric();
+    await param('event', apiError('eventRequired')).notEmpty().run(req)
+    await query('count', apiError('countRequired')).notEmpty().isNumeric().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const coupons = await Coupon.generate(req.params.event, req.query.count);
     res.respond(200, coupons);
@@ -122,10 +123,10 @@ api.validateCoupon = {
     optional: true,
   })],
   async handler (req, res) {
-    req.checkParams('code', res.t('couponCodeRequired')).notEmpty();
+    await param('code', res.t('couponCodeRequired')).notEmpty().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     let valid = false;
     const code = couponCode.validate(req.params.code);
diff --git a/website/server/controllers/api-v3/groups.js b/website/server/controllers/api-v3/groups.js
index 7d0a4fb49a..498990d3cb 100644
--- a/website/server/controllers/api-v3/groups.js
+++ b/website/server/controllers/api-v3/groups.js
@@ -9,6 +9,7 @@ import pick from 'lodash/pick';
 import uniqBy from 'lodash/uniqBy';
 import nconf from 'nconf';
 import moment from 'moment';
+import { body, param, query , validationResult } from 'express-validator';
 import { authWithHeaders } from '../../middlewares/auth';
 import {
   model as Group,
@@ -132,10 +133,10 @@ api.createGroup = {
     const group = new Group(Group.sanitize(req.body));
     group.leader = user._id;
 
-    req.checkBody('summary', apiError('summaryLengthExceedsMax')).isLength({ max: MAX_SUMMARY_SIZE_FOR_GUILDS });
+    await body('summary', apiError('summaryLengthExceedsMax')).isLength({ max: MAX_SUMMARY_SIZE_FOR_GUILDS }).run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     if (group.type === 'guild') {
       if (!user.hasPermission('fullAccess')) {
@@ -206,10 +207,10 @@ api.createGroupPlan = {
     const { user } = res.locals;
     const group = new Group(Group.sanitize(req.body.groupToCreate));
 
-    req.checkBody('paymentType', res.t('paymentTypeRequired')).notEmpty();
-    req.checkBody('summary', apiError('summaryLengthExceedsMax')).isLength({ max: MAX_SUMMARY_SIZE_FOR_GUILDS });
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    await body('paymentType', res.t('paymentTypeRequired')).notEmpty().run(req)
+    await body('summary', apiError('summaryLengthExceedsMax')).isLength({ max: MAX_SUMMARY_SIZE_FOR_GUILDS }).run(req)
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     // @TODO: Change message
     if (group.privacy !== 'private') throw new NotAuthorized(res.t('partyMustbePrivate'));
@@ -321,13 +322,13 @@ api.getGroups = {
   async handler (req, res) {
     const { user } = res.locals;
 
-    req.checkQuery('type', res.t('groupTypesRequired')).notEmpty();
+    await query('type', res.t('groupTypesRequired')).notEmpty().run(req)
     // pagination options, can only be used with public guilds
-    req.checkQuery('paginate').optional().isIn(['true', 'false'], apiError('guildsPaginateBooleanString'));
-    req.checkQuery('page').optional().isInt({ min: 0 }, apiError('queryPageInteger'));
+    await query('paginate').optional().isIn(['true', 'false'], apiError('guildsPaginateBooleanString')).run(req)
+    await query('page').optional().isInt({ min: 0 }, apiError('queryPageInteger')).run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const types = req.query.type.split(',');
 
@@ -419,10 +420,10 @@ api.getGroup = {
   async handler (req, res) {
     const { user } = res.locals;
 
-    req.checkParams('groupId', apiError('groupIdRequired')).notEmpty();
+    await param('groupId', apiError('groupIdRequired')).notEmpty().run(req);
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { groupId } = req.params;
     const group = await Group.getGroup({ user, groupId, populateLeader: false });
@@ -481,11 +482,11 @@ api.updateGroup = {
   async handler (req, res) {
     const { user } = res.locals;
 
-    req.checkParams('groupId', apiError('groupIdRequired')).notEmpty();
-    req.checkBody('summary', apiError('summaryLengthExceedsMax')).isLength({ max: MAX_SUMMARY_SIZE_FOR_GUILDS });
+    await param('groupId', apiError('groupIdRequired')).notEmpty().run(req);
+    await body('summary', apiError('summaryLengthExceedsMax')).isLength({ max: MAX_SUMMARY_SIZE_FOR_GUILDS }).run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
     const optionalMembership = Boolean(user.hasPermission('moderator'));
     const group = await Group.getGroup({ user, groupId: req.params.groupId, optionalMembership });
 
@@ -567,10 +568,10 @@ api.joinGroup = {
     const { user } = res.locals;
     let inviter;
 
-    req.checkParams('groupId', apiError('groupIdRequired')).notEmpty(); // .isUUID(); can't be used because it would block 'habitrpg' or 'party'
+    await param('groupId', apiError('groupIdRequired')).notEmpty().run(req); // .isUUID(); can't be used because it would block 'habitrpg' or 'party'
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     // Works even if the user is not yet a member of the group
     // Do not fetch chat and work even if the user is not yet a member of the group
@@ -760,10 +761,10 @@ api.rejectGroupInvite = {
   async handler (req, res) {
     const { user } = res.locals;
 
-    req.checkParams('groupId', apiError('groupIdRequired')).notEmpty(); // .isUUID(); can't be used because it would block 'habitrpg' or 'party'
+    await param('groupId', apiError('groupIdRequired')).notEmpty().run(req); // .isUUID(); can't be used because it would block 'habitrpg' or 'party'
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { groupId } = req.params;
     let isUserInvited = false;
@@ -831,13 +832,13 @@ api.leaveGroup = {
   middlewares: [authWithHeaders()],
   async handler (req, res) {
     const { user } = res.locals;
-    req.checkParams('groupId', apiError('groupIdRequired')).notEmpty();
+    await param('groupId', apiError('groupIdRequired')).notEmpty().run(req);
     // When removing the user from challenges, should we keep the tasks?
-    req.checkQuery('keep', apiError('keepOrRemoveAll')).optional().isIn(['keep-all', 'remove-all']);
-    req.checkBody('keepChallenges', apiError('groupRemainOrLeaveChallenges')).optional().isIn(['remain-in-challenges', 'leave-challenges']);
+    await query('keep', apiError('keepOrRemoveAll')).optional().isIn(['keep-all', 'remove-all']).run(req)
+    await body('keepChallenges', apiError('groupRemainOrLeaveChallenges')).optional().isIn(['remain-in-challenges', 'leave-challenges']).run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { groupId } = req.params;
     await leaveGroup({
@@ -899,11 +900,11 @@ api.removeGroupMember = {
   async handler (req, res) {
     const { user } = res.locals;
 
-    req.checkParams('groupId', apiError('groupIdRequired')).notEmpty();
-    req.checkParams('memberId', res.t('userIdRequired')).notEmpty().isUUID();
+    await param('groupId', apiError('groupIdRequired')).notEmpty().run(req);
+    await param('memberId', res.t('userIdRequired')).notEmpty().isUUID().run(req);
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
     const optionalMembership = Boolean(user.hasPermission('moderator'));
     const group = await Group.getGroup({
       user, groupId: req.params.groupId, optionalMembership, fields: '-chat',
@@ -1105,12 +1106,12 @@ api.inviteToGroup = {
 
     if (user.flags.chatRevoked) throw new NotAuthorized(res.t('chatPrivilegesRevoked'));
 
-    req.checkParams('groupId', apiError('groupIdRequired')).notEmpty();
+    await param('groupId', apiError('groupIdRequired')).notEmpty().run(req);
 
     if (user.invitesSent >= MAX_EMAIL_INVITES_BY_USER) throw new NotAuthorized(res.t('inviteLimitReached', { techAssistanceEmail: TECH_ASSISTANCE_EMAIL }));
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const group = await Group.getGroup({ user, groupId: req.params.groupId, fields: '-chat' });
     if (!group) throw new NotFound(res.t('groupNotFound'));
@@ -1182,11 +1183,11 @@ api.addGroupManager = {
     const { user } = res.locals;
     const { managerId } = req.body;
 
-    req.checkParams('groupId', apiError('groupIdRequired')).notEmpty(); // .isUUID(); can't be used because it would block 'habitrpg' or 'party'
-    req.checkBody('managerId', apiError('managerIdRequired')).notEmpty();
+    await param('groupId', apiError('groupIdRequired')).notEmpty().run(req); // .isUUID(); can't be used because it would block 'habitrpg' or 'party'
+    await body('managerId', apiError('managerIdRequired')).notEmpty().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const newManager = await User.findById(managerId, 'guilds party').exec();
     const groupFields = basicGroupFields.concat(' managers');
@@ -1232,11 +1233,11 @@ api.removeGroupManager = {
     const { user } = res.locals;
     const { managerId } = req.body;
 
-    req.checkParams('groupId', apiError('groupIdRequired')).notEmpty(); // .isUUID(); can't be used because it would block 'habitrpg' or 'party'
-    req.checkBody('managerId', apiError('managerIdRequired')).notEmpty();
+    await param('groupId', apiError('groupIdRequired')).notEmpty().run(req); // .isUUID(); can't be used because it would block 'habitrpg' or 'party'
+    await body('managerId', apiError('managerIdRequired')).notEmpty().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const groupFields = basicGroupFields.concat(' managers');
     const group = await Group.getGroup({ user, groupId: req.params.groupId, fields: groupFields });
@@ -1323,7 +1324,7 @@ api.getLookingForParty = {
     const USERS_PER_PAGE = 30;
     const { user } = res.locals;
 
-    req.checkQuery('page').optional().isInt({ min: 0 }, apiError('queryPageInteger'));
+    await query('page').optional().isInt({ min: 0 }, apiError('queryPageInteger')).run(req)
     const PAGE = req.query.page || 0;
     const PAGE_START = USERS_PER_PAGE * PAGE;
 
diff --git a/website/server/controllers/api-v3/hall.js b/website/server/controllers/api-v3/hall.js
index 78ad8669d8..3121537bb3 100644
--- a/website/server/controllers/api-v3/hall.js
+++ b/website/server/controllers/api-v3/hall.js
@@ -1,5 +1,6 @@
 import _ from 'lodash';
 import validator from 'validator';
+import { query, param , validationResult } from 'express-validator';
 import { authWithHeaders } from '../../middlewares/auth';
 import { ensurePermission } from '../../middlewares/ensureAccessRight';
 import { model as User } from '../../models/user';
@@ -73,10 +74,10 @@ api.getPatrons = {
   url: '/hall/patrons',
   middlewares: [authWithHeaders()],
   async handler (req, res) {
-    req.checkQuery('page').optional().isInt({ min: 0 }, apiError('queryPageInteger'));
+    await query('page').optional().isInt({ min: 0 }, apiError('queryPageInteger')).run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const page = req.query.page ? Number(req.query.page) : 0;
     const perPage = 50;
@@ -177,10 +178,10 @@ api.getHero = {
   url: '/hall/heroes/:heroId',
   middlewares: [authWithHeaders(), ensurePermission('userSupport')],
   async handler (req, res) {
-    req.checkParams('heroId', res.t('heroIdRequired')).notEmpty();
+    await param('heroId', res.t('heroIdRequired')).notEmpty().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { heroId } = req.params;
 
@@ -263,10 +264,10 @@ api.updateHero = {
     const { heroId } = req.params;
     const updateData = req.body;
 
-    req.checkParams('heroId', res.t('heroIdRequired')).notEmpty().isUUID();
+    await param('heroId', res.t('heroIdRequired')).notEmpty().isUUID().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const hero = await User.findById(heroId).exec();
     if (!hero) throw new NotFound(res.t('userWithIDNotFound', { userId: heroId }));
@@ -555,10 +556,10 @@ api.getHeroParty = { // @TODO XXX add tests
   url: '/hall/heroes/party/:groupId',
   middlewares: [authWithHeaders(), ensurePermission('userSupport')],
   async handler (req, res) {
-    req.checkParams('groupId', apiError('groupIdRequired')).notEmpty().isUUID();
+    await param('groupId', apiError('groupIdRequired')).notEmpty().isUUID().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { groupId } = req.params;
 
@@ -597,10 +598,10 @@ api.getHeroGroupPlans = {
   url: '/hall/heroes/:heroId/group-plans',
   middlewares: [authWithHeaders(), ensurePermission('userSupport')],
   async handler (req, res) {
-    req.checkParams('heroId', res.t('heroIdRequired')).notEmpty();
+    await param('heroId', res.t('heroIdRequired')).notEmpty().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { heroId } = req.params;
 
diff --git a/website/server/controllers/api-v3/members.js b/website/server/controllers/api-v3/members.js
index 764a0ee211..76b8da081e 100644
--- a/website/server/controllers/api-v3/members.js
+++ b/website/server/controllers/api-v3/members.js
@@ -1,5 +1,6 @@
 import escapeRegExp from 'lodash/escapeRegExp';
 import pick from 'lodash/pick';
+import { body, param, query as checkQuery , validationResult } from 'express-validator';
 import { authWithHeaders } from '../../middlewares/auth';
 import {
   model as User,
@@ -103,10 +104,10 @@ api.getMember = {
   url: '/members/:memberId',
   middlewares: [authWithHeaders()],
   async handler (req, res) {
-    req.checkParams('memberId', res.t('memberIdRequired')).notEmpty().isUUID();
+    await param('memberId', res.t('memberIdRequired')).notEmpty().isUUID().run(req);
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { memberId } = req.params;
 
@@ -132,10 +133,10 @@ api.getMemberByUsername = {
   url: '/members/username/:username',
   middlewares: [authWithHeaders()],
   async handler (req, res) {
-    req.checkParams('username', res.t('invalidReqParams')).notEmpty();
+    await param('username', res.t('invalidReqParams')).notEmpty().run(req);
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     let username = req.params.username.toLowerCase();
     if (username[0] === '@') username = username.slice(1, username.length);
@@ -261,10 +262,10 @@ api.getMemberAchievements = {
   url: '/members/:memberId/achievements',
   middlewares: [authWithHeaders()],
   async handler (req, res) {
-    req.checkParams('memberId', res.t('memberIdRequired')).notEmpty().isUUID();
+    await param('memberId', res.t('memberIdRequired')).notEmpty().isUUID().run(req);
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { memberId } = req.params;
 
@@ -292,13 +293,13 @@ function _getMembersForItem (type) {
   }
 
   return async function handleGetMembersForItem (req, res) {
-    req.checkParams('groupId', res.t('groupIdRequired')).notEmpty();
-    req.checkQuery('lastId').optional().notEmpty().isUUID();
+    await param('groupId', res.t('groupIdRequired')).notEmpty().run(req);
+    await checkQuery('lastId').optional().notEmpty().isUUID().run(req)
     // Allow an arbitrary number of results (up to 60)
-    req.checkQuery('limit', res.t('groupIdRequired')).optional().notEmpty().isInt({ min: 1, max: 60 });
+    await checkQuery('limit', res.t('groupIdRequired')).optional().notEmpty().isInt({ min: 1, max: 60 }).run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { groupId } = req.params;
     const { lastId } = req.query;
@@ -566,11 +567,11 @@ api.getChallengeMemberProgress = {
   url: '/challenges/:challengeId/members/:memberId',
   middlewares: [authWithHeaders()],
   async handler (req, res) {
-    req.checkParams('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID();
-    req.checkParams('memberId', res.t('memberIdRequired')).notEmpty().isUUID();
+    await param('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID().run(req);
+    await param('memberId', res.t('memberIdRequired')).notEmpty().isUUID().run(req);
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { user } = res.locals;
     const { challengeId } = req.params;
@@ -627,11 +628,11 @@ api.getObjectionsToInteraction = {
   url: '/members/:toUserId/objections/:interaction',
   middlewares: [authWithHeaders()],
   async handler (req, res) {
-    req.checkParams('toUserId', res.t('toUserIDRequired')).notEmpty().isUUID();
-    req.checkParams('interaction', res.t('interactionRequired')).notEmpty().isIn(KNOWN_INTERACTIONS);
+    await param('toUserId', res.t('toUserIDRequired')).notEmpty().isUUID().run(req);
+    await param('interaction', res.t('interactionRequired')).notEmpty().isIn(KNOWN_INTERACTIONS).run(req);
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const sender = res.locals.user;
     const receiver = await User.findById(req.params.toUserId).exec();
@@ -662,11 +663,11 @@ api.transferGems = {
   url: '/members/transfer-gems',
   middlewares: [authWithHeaders()],
   async handler (req, res) {
-    req.checkBody('toUserId', res.t('toUserIDRequired')).notEmpty().isUUID();
-    req.checkBody('gemAmount', res.t('gemAmountRequired')).notEmpty().isInt();
+    await body('toUserId', res.t('toUserIDRequired')).notEmpty().isUUID().run(req)
+    await body('gemAmount', res.t('gemAmountRequired')).notEmpty().isInt().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const sender = res.locals.user;
     const receiver = await User.findById(req.body.toUserId).exec();
@@ -815,9 +816,9 @@ api.clearUserFlags = {
     const { user } = res.locals;
     const { memberId } = req.params;
 
-    req.checkParams('memberId', res.t('memberIdRequired')).notEmpty().isUUID();
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    await param('memberId', res.t('memberIdRequired')).notEmpty().isUUID().run(req);
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     if (!user.hasPermission('moderator')) {
       throw new BadRequest('Only a moderator may clear reports from a profile.');
diff --git a/website/server/controllers/api-v3/modelsPaths.js b/website/server/controllers/api-v3/modelsPaths.js
index 5358d44f8c..338b8cabe5 100644
--- a/website/server/controllers/api-v3/modelsPaths.js
+++ b/website/server/controllers/api-v3/modelsPaths.js
@@ -1,4 +1,5 @@
 import mongoose from 'mongoose';
+import { param , validationResult } from 'express-validator';
 
 const api = {};
 
@@ -36,10 +37,10 @@ api.getModelPaths = {
   method: 'GET',
   url: '/models/:model/paths',
   async handler (req, res) {
-    req.checkParams('model', res.t('modelNotFound')).notEmpty().isIn(allModels);
+    await param('model', res.t('modelNotFound')).notEmpty().isIn(allModels).run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     let { model } = req.params;
     // tasks models are lowercase, the others have the first letter uppercase (User, Group)
diff --git a/website/server/controllers/api-v3/pushNotifications.js b/website/server/controllers/api-v3/pushNotifications.js
index 1b9c8a929a..5526d5adf4 100644
--- a/website/server/controllers/api-v3/pushNotifications.js
+++ b/website/server/controllers/api-v3/pushNotifications.js
@@ -1,3 +1,4 @@
+import { body, param , validationResult } from 'express-validator';
 import { authWithHeaders } from '../../middlewares/auth';
 import {
   NotFound,
@@ -25,11 +26,11 @@ api.addPushDevice = {
   async handler (req, res) {
     const { user } = res.locals;
 
-    req.checkBody('regId', res.t('regIdRequired')).notEmpty();
-    req.checkBody('type', res.t('typeRequired')).notEmpty().isIn(['ios', 'android']);
+    await body('regId', res.t('regIdRequired')).notEmpty().run(req)
+    await body('type', res.t('typeRequired')).notEmpty().isIn(['ios', 'android']).run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { pushDevices } = user;
 
@@ -75,10 +76,10 @@ api.removePushDevice = {
   async handler (req, res) {
     const { user } = res.locals;
 
-    req.checkParams('regId', res.t('regIdRequired')).notEmpty();
+    await param('regId', res.t('regIdRequired')).notEmpty().run(req);
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { regId } = req.params;
 
diff --git a/website/server/controllers/api-v3/quests.js b/website/server/controllers/api-v3/quests.js
index f45135e5b0..77d7627361 100644
--- a/website/server/controllers/api-v3/quests.js
+++ b/website/server/controllers/api-v3/quests.js
@@ -2,6 +2,7 @@ import each from 'lodash/each';
 import every from 'lodash/every';
 import isBoolean from 'lodash/isBoolean';
 import pick from 'lodash/pick';
+import { param , validationResult } from 'express-validator';
 import { authWithHeaders } from '../../middlewares/auth';
 import { getAnalyticsServiceByEnvironment } from '../../libs/analyticsService';
 import {
@@ -68,10 +69,10 @@ api.inviteToQuest = {
     const { questKey } = req.params;
     const quest = questScrolls[questKey];
 
-    req.checkParams('groupId', apiError('groupIdRequired')).notEmpty();
+    await param('groupId', apiError('groupIdRequired')).notEmpty().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const group = await Group.getGroup({ user, groupId: req.params.groupId, fields: basicGroupFields.concat(' quest chat') });
 
@@ -202,10 +203,10 @@ api.acceptQuest = {
   async handler (req, res) {
     const { user } = res.locals;
 
-    req.checkParams('groupId', apiError('groupIdRequired')).notEmpty();
+    await param('groupId', apiError('groupIdRequired')).notEmpty().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const group = await Group.getGroup({ user, groupId: req.params.groupId, fields: basicGroupFields.concat(' quest chat') });
 
@@ -267,10 +268,10 @@ api.rejectQuest = {
   async handler (req, res) {
     const { user } = res.locals;
 
-    req.checkParams('groupId', apiError('groupIdRequired')).notEmpty();
+    await param('groupId', apiError('groupIdRequired')).notEmpty().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const group = await Group.getGroup({ user, groupId: req.params.groupId, fields: basicGroupFields.concat(' quest chat') });
     if (!group) throw new NotFound(res.t('groupNotFound'));
@@ -335,10 +336,10 @@ api.forceStart = {
   async handler (req, res) {
     const { user } = res.locals;
 
-    req.checkParams('groupId', apiError('groupIdRequired')).notEmpty();
+    await param('groupId', apiError('groupIdRequired')).notEmpty().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const group = await Group.getGroup({ user, groupId: req.params.groupId, fields: basicGroupFields.concat(' quest chat') });
 
@@ -400,10 +401,10 @@ api.cancelQuest = {
     const { user } = res.locals;
     const { groupId } = req.params;
 
-    req.checkParams('groupId', apiError('groupIdRequired')).notEmpty();
+    await param('groupId', apiError('groupIdRequired')).notEmpty().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const group = await Group.getGroup({ user, groupId, fields: basicGroupFields.concat(' quest') });
 
@@ -475,10 +476,10 @@ api.abortQuest = {
     const { user } = res.locals;
     const { groupId } = req.params;
 
-    req.checkParams('groupId', apiError('groupIdRequired')).notEmpty();
+    await param('groupId', apiError('groupIdRequired')).notEmpty().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const group = await Group.getGroup({ user, groupId, fields: basicGroupFields.concat(' quest chat') });
 
@@ -549,10 +550,10 @@ api.leaveQuest = {
     const { user } = res.locals;
     const { groupId } = req.params;
 
-    req.checkParams('groupId', apiError('groupIdRequired')).notEmpty();
+    await param('groupId', apiError('groupIdRequired')).notEmpty().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const group = await Group.getGroup({ user, groupId, fields: basicGroupFields.concat(' quest') });
 
diff --git a/website/server/controllers/api-v3/tasks.js b/website/server/controllers/api-v3/tasks.js
index 5d91b70557..606bad17fb 100644
--- a/website/server/controllers/api-v3/tasks.js
+++ b/website/server/controllers/api-v3/tasks.js
@@ -2,6 +2,7 @@ import assign from 'lodash/assign';
 import find from 'lodash/find';
 import merge from 'lodash/merge';
 import pick from 'lodash/pick';
+import { param, query , validationResult } from 'express-validator'
 import moment from 'moment';
 import { authWithHeaders } from '../../middlewares/auth';
 import {
@@ -310,9 +311,9 @@ api.createChallengeTasks = {
   url: '/tasks/challenge/:challengeId',
   middlewares: [authWithHeaders()],
   async handler (req, res) {
-    req.checkParams('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID();
+    await param('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID().run(req)
 
-    const reqValidationErrors = req.validationErrors();
+    const reqValidationErrors = validationResult(req).array();
     if (reqValidationErrors) throw reqValidationErrors;
 
     const { user } = res.locals;
@@ -394,10 +395,10 @@ api.getUserTasks = {
   async handler (req, res) {
     const types = Tasks.tasksTypes.map(type => `${type}s`);
     types.push('completedTodos', '_allCompletedTodos'); // _allCompletedTodos is currently in BETA and is likely to be removed in future
-    req.checkQuery('type', res.t('invalidTasksTypeExtra')).optional().isIn(types);
+    await query('type', res.t('invalidTasksTypeExtra')).optional().isIn(types).run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { user } = res.locals;
     const { dueDate } = req.query;
@@ -447,12 +448,12 @@ api.getChallengeTasks = {
   url: '/tasks/challenge/:challengeId',
   middlewares: [authWithHeaders()],
   async handler (req, res) {
-    req.checkParams('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID();
+    await param('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID().run(req)
     const types = Tasks.tasksTypes.map(type => `${type}s`);
-    req.checkQuery('type', res.t('invalidTasksType')).optional().isIn(types);
+    await query('type', res.t('invalidTasksType')).optional().isIn(types).run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { user } = res.locals;
     const { challengeId } = req.params;
@@ -602,10 +603,10 @@ api.updateTask = {
   async handler (req, res) {
     const { user } = res.locals;
 
-    req.checkParams('taskId', apiError('taskIdRequired')).notEmpty();
+    await param('taskId', apiError('taskIdRequired')).notEmpty().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { taskId } = req.params;
     const task = await Tasks.Task.findByIdOrAlias(taskId, user._id);
@@ -805,11 +806,11 @@ api.moveTask = {
   url: '/tasks/:taskId/move/to/:position',
   middlewares: [authWithHeaders()],
   async handler (req, res) {
-    req.checkParams('taskId', apiError('taskIdRequired')).notEmpty();
-    req.checkParams('position', res.t('positionRequired')).notEmpty().isNumeric();
+    await param('taskId', apiError('taskIdRequired')).notEmpty().run(req)
+    await param('position', res.t('positionRequired')).notEmpty().isNumeric().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { user } = res.locals;
     const { taskId } = req.params;
@@ -908,10 +909,10 @@ api.addChecklistItem = {
   async handler (req, res) {
     const { user } = res.locals;
 
-    req.checkParams('taskId', apiError('taskIdRequired')).notEmpty();
+    await param('taskId', apiError('taskIdRequired')).notEmpty().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { taskId } = req.params;
     const task = await Tasks.Task.findByIdOrAlias(taskId, user._id);
@@ -957,11 +958,11 @@ api.scoreCheckListItem = {
   async handler (req, res) {
     const { user } = res.locals;
 
-    req.checkParams('taskId', apiError('taskIdRequired')).notEmpty();
-    req.checkParams('itemId', res.t('itemIdRequired')).notEmpty().isUUID();
+    await param('taskId', apiError('taskIdRequired')).notEmpty().run(req)
+    await param('itemId', res.t('itemIdRequired')).notEmpty().isUUID().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { taskId } = req.params;
     const task = await Tasks.Task.findByIdOrAlias(taskId, user._id);
@@ -1018,11 +1019,11 @@ api.updateChecklistItem = {
   async handler (req, res) {
     const { user } = res.locals;
 
-    req.checkParams('taskId', apiError('taskIdRequired')).notEmpty();
-    req.checkParams('itemId', res.t('itemIdRequired')).notEmpty().isUUID();
+    await param('taskId', apiError('taskIdRequired')).notEmpty().run(req)
+    await param('itemId', res.t('itemIdRequired')).notEmpty().isUUID().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { taskId } = req.params;
     const task = await Tasks.Task.findByIdOrAlias(taskId, user._id);
@@ -1079,11 +1080,11 @@ api.removeChecklistItem = {
   async handler (req, res) {
     const { user } = res.locals;
 
-    req.checkParams('taskId', apiError('taskIdRequired')).notEmpty();
-    req.checkParams('itemId', res.t('itemIdRequired')).notEmpty().isUUID();
+    await param('taskId', apiError('taskIdRequired')).notEmpty().run(req)
+    await param('itemId', res.t('itemIdRequired')).notEmpty().isUUID().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { taskId } = req.params;
     const task = await Tasks.Task.findByIdOrAlias(taskId, user._id);
@@ -1141,12 +1142,12 @@ api.addTagToTask = {
   async handler (req, res) {
     const { user } = res.locals;
 
-    req.checkParams('taskId', apiError('taskIdRequired')).notEmpty();
+    await param('taskId', apiError('taskIdRequired')).notEmpty().run(req)
     const userTags = user.tags.map(tag => tag.id);
-    req.checkParams('tagId', res.t('tagIdRequired')).notEmpty().isUUID().isIn(userTags);
+    await param('tagId', res.t('tagIdRequired')).notEmpty().isUUID().isIn(userTags).run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { taskId } = req.params;
     const task = await Tasks.Task.findByIdOrAlias(taskId, user._id, { userId: user._id });
@@ -1198,11 +1199,11 @@ api.removeTagFromTask = {
   async handler (req, res) {
     const { user } = res.locals;
 
-    req.checkParams('taskId', apiError('taskIdRequired')).notEmpty();
-    req.checkParams('tagId', res.t('tagIdRequired')).notEmpty().isUUID();
+    await param('taskId', apiError('taskIdRequired')).notEmpty().run(req)
+    await param('tagId', res.t('tagIdRequired')).notEmpty().isUUID().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { taskId } = req.params;
     const task = await Tasks.Task.findByIdOrAlias(taskId, user._id, { userId: user._id });
@@ -1243,11 +1244,11 @@ api.unlinkAllTasks = {
   url: '/tasks/unlink-all/:challengeId',
   middlewares: [authWithHeaders()],
   async handler (req, res) {
-    req.checkParams('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID();
-    req.checkQuery('keep', apiError('keepOrRemoveAll')).notEmpty().isIn(['keep-all', 'remove-all']);
+    await param('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID().run(req)
+    await query('keep', apiError('keepOrRemoveAll')).notEmpty().isIn(['keep-all', 'remove-all']).run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { user } = res.locals;
     const { keep } = req.query;
@@ -1309,11 +1310,11 @@ api.unlinkOneTask = {
   url: '/tasks/unlink-one/:taskId',
   middlewares: [authWithHeaders()],
   async handler (req, res) {
-    req.checkParams('taskId', apiError('taskIdRequired')).notEmpty().isUUID();
-    req.checkQuery('keep', apiError('keepOrRemove')).notEmpty().isIn(['keep', 'remove']);
+    await param('taskId', apiError('taskIdRequired')).notEmpty().isUUID().run(req)
+    await query('keep', apiError('keepOrRemove')).notEmpty().isIn(['keep', 'remove']).run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { user } = res.locals;
     const { keep } = req.query;
diff --git a/website/server/controllers/api-v3/tasks/groups.js b/website/server/controllers/api-v3/tasks/groups.js
index 95ec995fbf..437577226e 100644
--- a/website/server/controllers/api-v3/tasks/groups.js
+++ b/website/server/controllers/api-v3/tasks/groups.js
@@ -1,5 +1,6 @@
 import pick from 'lodash/pick';
 import isUUID from 'validator/lib/isUUID';
+import { param , query , validationResult } from 'express-validator';
 import { authWithHeaders } from '../../../middlewares/auth';
 import * as Tasks from '../../../models/task';
 import { model as Group } from '../../../models/group';
@@ -45,9 +46,9 @@ api.createGroupTasks = {
   url: '/tasks/group/:groupId',
   middlewares: [authWithHeaders()],
   async handler (req, res) {
-    req.checkParams('groupId', apiError('groupIdRequired')).notEmpty().isUUID();
+    await param('groupId', apiError('groupIdRequired')).notEmpty().isUUID().run(req)
 
-    const reqValidationErrors = req.validationErrors();
+    const reqValidationErrors = validationResult(req).array();
     if (reqValidationErrors) throw reqValidationErrors;
 
     const { user } = res.locals;
@@ -92,11 +93,11 @@ api.getGroupTasks = {
   url: '/tasks/group/:groupId',
   middlewares: [authWithHeaders()],
   async handler (req, res) {
-    req.checkParams('groupId', apiError('groupIdRequired')).notEmpty().isUUID();
-    req.checkQuery('type', res.t('invalidTasksType')).optional().isIn(types);
+    await param('groupId', apiError('groupIdRequired')).notEmpty().isUUID().run(req)
+    await query('type', res.t('invalidTasksType')).optional().isIn(types).run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { user } = res.locals;
 
@@ -132,10 +133,10 @@ api.groupMoveTask = {
   url: '/group-tasks/:taskId/move/to/:position',
   middlewares: [authWithHeaders()],
   async handler (req, res) {
-    req.checkParams('taskId', apiError('taskIdRequired')).notEmpty();
-    req.checkParams('position', res.t('positionRequired')).notEmpty().isNumeric();
+    await param('taskId', apiError('taskIdRequired')).notEmpty().run(req)
+    await param('position', res.t('positionRequired')).notEmpty().isNumeric().run(req)
 
-    const reqValidationErrors = req.validationErrors();
+    const reqValidationErrors = validationResult(req).array();
     if (reqValidationErrors) throw reqValidationErrors;
 
     const { user } = res.locals;
@@ -203,9 +204,9 @@ api.assignTask = {
   url: '/tasks/:taskId/assign',
   middlewares: [authWithHeaders()],
   async handler (req, res) {
-    req.checkParams('taskId', apiError('taskIdRequired')).notEmpty().isUUID();
+    await param('taskId', apiError('taskIdRequired')).notEmpty().isUUID().run(req)
 
-    const reqValidationErrors = req.validationErrors();
+    const reqValidationErrors = validationResult(req).array();
     if (reqValidationErrors) throw reqValidationErrors;
 
     const { user } = res.locals;
@@ -280,10 +281,10 @@ api.unassignTask = {
   url: '/tasks/:taskId/unassign/:assignedUserId',
   middlewares: [authWithHeaders()],
   async handler (req, res) {
-    req.checkParams('taskId', apiError('taskIdRequired')).notEmpty().isUUID();
-    req.checkParams('assignedUserId', res.t('userIdRequired')).notEmpty().isUUID();
+    await param('taskId', apiError('taskIdRequired')).notEmpty().isUUID().run(req)
+    await param('assignedUserId', res.t('userIdRequired')).notEmpty().isUUID().run(req)
 
-    const reqValidationErrors = req.validationErrors();
+    const reqValidationErrors = validationResult(req).array();
     if (reqValidationErrors) throw reqValidationErrors;
 
     const { user } = res.locals;
@@ -337,10 +338,10 @@ api.taskNeedsWork = {
   url: '/tasks/:taskId/needs-work/:userId',
   middlewares: [authWithHeaders()],
   async handler (req, res) {
-    req.checkParams('taskId', apiError('taskIdRequired')).notEmpty().isUUID();
-    req.checkParams('userId', res.t('userIdRequired')).notEmpty().isUUID();
+    await param('taskId', apiError('taskIdRequired')).notEmpty().isUUID().run(req)
+    await param('userId', res.t('userIdRequired')).notEmpty().isUUID().run(req)
 
-    const reqValidationErrors = req.validationErrors();
+    const reqValidationErrors = validationResult(req).array();
     if (reqValidationErrors) throw reqValidationErrors;
 
     const { user } = res.locals;
diff --git a/website/server/controllers/api-v3/user.js b/website/server/controllers/api-v3/user.js
index ddc1f81ed0..7800dde789 100644
--- a/website/server/controllers/api-v3/user.js
+++ b/website/server/controllers/api-v3/user.js
@@ -4,6 +4,7 @@ import isFunction from 'lodash/isFunction';
 import pick from 'lodash/pick';
 import nconf from 'nconf';
 import get from 'lodash/get';
+import { param , validationResult } from 'express-validator';
 import { authWithHeaders } from '../../middlewares/auth';
 import common from '../../../common';
 import {
@@ -1735,11 +1736,11 @@ api.movePinnedItem = {
   url: '/user/move-pinned-item/:path/move/to/:position',
   middlewares: [authWithHeaders()],
   async handler (req, res) {
-    req.checkParams('path', res.t('taskIdRequired')).notEmpty();
-    req.checkParams('position', res.t('positionRequired')).notEmpty().isNumeric();
+    await param('path', res.t('taskIdRequired')).notEmpty().run(req)
+    await param('position', res.t('positionRequired')).notEmpty().isNumeric().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { user } = res.locals;
     const { path } = req.params;
diff --git a/website/server/controllers/api-v4/admin.js b/website/server/controllers/api-v4/admin.js
index 747a0c777d..d8cef50ccb 100644
--- a/website/server/controllers/api-v4/admin.js
+++ b/website/server/controllers/api-v4/admin.js
@@ -1,5 +1,6 @@
 import validator from 'validator';
 import merge from 'lodash/merge';
+import { param , validationResult } from 'express-validator';
 import uniqBy from 'lodash/uniqBy';
 import { v4 as uuid } from 'uuid';
 import { authWithHeaders } from '../../middlewares/auth';
@@ -41,10 +42,10 @@ api.searchHero = {
   url: '/admin/search/:userIdentifier',
   middlewares: [authWithHeaders(), ensurePermission('userSupport')],
   async handler (req, res) {
-    req.checkParams('userIdentifier', res.t('userIdentifierRequired')).notEmpty();
+    await param('userIdentifier', res.t('userIdentifierRequired')).notEmpty().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { userIdentifier } = req.params;
 
@@ -109,10 +110,10 @@ api.getUserHistory = {
   url: '/admin/user/:userId/history',
   middlewares: [authWithHeaders(), ensurePermission('userSupport')],
   async handler (req, res) {
-    req.checkParams('userId', res.t('heroIdRequired')).notEmpty().isUUID();
+    await param('userId', res.t('heroIdRequired')).notEmpty().isUUID().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { userId } = req.params;
 
@@ -161,10 +162,10 @@ api.updateBlocker = {
   url: '/admin/blockers/:blockerId',
   middlewares: [authWithHeaders(), ensurePermission('accessControl')],
   async handler (req, res) {
-    req.checkParams('blockerId', res.t('blockerIdRequired')).notEmpty().isUUID();
+    await param('blockerId', res.t('blockerIdRequired')).notEmpty().isUUID().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const blocker = await Blocker.findById(req.params.blockerId).exec();
     if (!blocker) throw new NotFound(res.t('blockerNotFound'));
@@ -181,10 +182,10 @@ api.deleteBlocker = {
   url: '/admin/blockers/:blockerId',
   middlewares: [authWithHeaders(), ensurePermission('accessControl')],
   async handler (req, res) {
-    req.checkParams('blockerId', res.t('blockerIdRequired')).notEmpty().isUUID();
+    await param('blockerId', res.t('blockerIdRequired')).notEmpty().isUUID().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const blocker = await Blocker.findById(req.params.blockerId).exec();
     if (!blocker) throw new NotFound(res.t('blockerNotFound'));
diff --git a/website/server/controllers/api-v4/auth.js b/website/server/controllers/api-v4/auth.js
index 7745a78af4..e27ce75baa 100644
--- a/website/server/controllers/api-v4/auth.js
+++ b/website/server/controllers/api-v4/auth.js
@@ -21,8 +21,8 @@ api.verifyUsername = {
       },
     });
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { user } = res.locals;
     const chosenUsername = req.body.username;
@@ -105,8 +105,8 @@ api.checkEmail = {
       },
     });
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const lowercaseEmail = req.body.email.toLowerCase();
     if (isRestrictedEmailDomain(lowercaseEmail)) {
diff --git a/website/server/controllers/api-v4/faq.js b/website/server/controllers/api-v4/faq.js
index 72b23f5561..5bde160ee0 100644
--- a/website/server/controllers/api-v4/faq.js
+++ b/website/server/controllers/api-v4/faq.js
@@ -1,4 +1,5 @@
 import _ from 'lodash';
+import { query , validationResult } from 'express-validator';
 import { langCodes } from '../../libs/i18n';
 import { apiError } from '../../libs/apiError';
 import common from '../../../common';
@@ -57,10 +58,10 @@ api.faq = {
   method: 'GET',
   url: '/faq',
   async handler (req, res) {
-    req.checkQuery('platform').optional().isIn(['web', 'android', 'ios'], apiError('invalidPlatform'));
+    await query('platform').optional().isIn(['web', 'android', 'ios'], apiError('invalidPlatform')).run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const proposedLang = req.query.language && req.query.language.toString();
     const language = langCodes.includes(proposedLang) ? proposedLang : 'en';
diff --git a/website/server/controllers/api-v4/inbox.js b/website/server/controllers/api-v4/inbox.js
index f1d8c6ffbe..f2a4875e4a 100644
--- a/website/server/controllers/api-v4/inbox.js
+++ b/website/server/controllers/api-v4/inbox.js
@@ -1,3 +1,4 @@
+import { param , validationResult } from 'express-validator';
 import { authWithHeaders } from '../../middlewares/auth';
 import { apiError } from '../../libs/apiError';
 import { NotFound } from '../../libs/errors';
@@ -38,10 +39,10 @@ api.deleteMessage = {
   middlewares: [authWithHeaders()],
   url: '/inbox/messages/:messageId',
   async handler (req, res) {
-    req.checkParams('messageId', apiError('messageIdRequired')).notEmpty().isUUID();
+    await param('messageId', apiError('messageIdRequired')).notEmpty().isUUID().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { messageId } = req.params;
     const { user } = res.locals;
@@ -216,10 +217,10 @@ api.likePrivateMessage = {
   url: '/inbox/like-private-message/:uniqueMessageId',
   middlewares: [authWithHeaders()],
   async handler (req, res) {
-    req.checkParams('uniqueMessageId', apiError('messageIdRequired')).notEmpty();
+    await param('uniqueMessageId', apiError('messageIdRequired')).notEmpty().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { user } = res.locals;
     const { uniqueMessageId } = req.params;
diff --git a/website/server/controllers/api-v4/members.js b/website/server/controllers/api-v4/members.js
index 9717907433..efef3c9f37 100644
--- a/website/server/controllers/api-v4/members.js
+++ b/website/server/controllers/api-v4/members.js
@@ -1,4 +1,5 @@
 import { sendJob } from '../../libs/worker';
+import { param , validationResult } from 'express-validator';
 import { authWithHeaders } from '../../middlewares/auth';
 import { ensurePermission } from '../../middlewares/ensureAccessRight';
 import { TransactionModel as Transaction } from '../../models/transaction';
@@ -16,9 +17,9 @@ api.purchaseHistory = {
   middlewares: [authWithHeaders(), ensurePermission('userSupport')],
   url: '/members/:memberId/purchase-history',
   async handler (req, res) {
-    req.checkParams('memberId', res.t('memberIdRequired')).notEmpty().isUUID();
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    await param('memberId', res.t('memberIdRequired')).notEmpty().isUUID().run(req)
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
     let transactions = await Transaction
       .find({ userId: req.params.memberId })
       .sort({ createdAt: -1 })
diff --git a/website/server/controllers/api-v4/news.js b/website/server/controllers/api-v4/news.js
index dd72ad8a20..8ffab68828 100644
--- a/website/server/controllers/api-v4/news.js
+++ b/website/server/controllers/api-v4/news.js
@@ -1,4 +1,5 @@
 import _ from 'lodash';
+import { param , validationResult } from 'express-validator';
 import { authWithHeaders } from '../../middlewares/auth';
 import { apiError } from '../../libs/apiError';
 import { model as NewsPost } from '../../models/newsPost';
@@ -110,7 +111,7 @@ api.getPost = {
   })],
   noLanguage: true,
   async handler (req, res) {
-    req.checkParams('postId', apiError('postIdRequired')).notEmpty().isUUID();
+    await param('postId', apiError('postIdRequired')).notEmpty().isUUID().run(req)
     const { user } = res.locals;
 
     const newsPost = await NewsPost.findById(req.params.postId).exec();
@@ -148,9 +149,9 @@ api.updateNews = {
   url: '/news/:postId',
   middlewares: [authWithHeaders(), ensurePermission('news')],
   async handler (req, res) {
-    req.checkParams('postId', apiError('postIdRequired')).notEmpty().isUUID();
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    await param('postId', apiError('postIdRequired')).notEmpty().isUUID().run(req)
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const newsPost = await NewsPost.findById(req.params.postId).exec();
     if (!newsPost) throw new NotFound(res.t('newsPostNotFound'));
@@ -183,9 +184,9 @@ api.deleteNews = {
   url: '/news/:postId',
   middlewares: [authWithHeaders(), ensurePermission('news')],
   async handler (req, res) {
-    req.checkParams('postId', apiError('postIdRequired')).notEmpty().isUUID();
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    await param('postId', apiError('postIdRequired')).notEmpty().isUUID().run(req)
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const newsPost = await NewsPost.findById(req.params.postId).exec();
     if (!newsPost) throw new NotFound(res.t('newsPostNotFound'));
diff --git a/website/server/controllers/api-v4/user.js b/website/server/controllers/api-v4/user.js
index e324ce13b6..885a6470d7 100644
--- a/website/server/controllers/api-v4/user.js
+++ b/website/server/controllers/api-v4/user.js
@@ -252,8 +252,8 @@ api.verifyDisplayName = {
       },
     });
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const chosenDisplayName = req.body.displayName;
 
diff --git a/website/server/controllers/top-level/dataexport.js b/website/server/controllers/top-level/dataexport.js
index 942ec67274..340af1f786 100644
--- a/website/server/controllers/top-level/dataexport.js
+++ b/website/server/controllers/top-level/dataexport.js
@@ -177,10 +177,10 @@ api.exportUserAvatarHtml = {
   async handler (/* req, res */) {
     throw new NotFound('This API route is currently not available. See https://github.com/HabitRPG/habitica/issues/9489.');
 
-    /* req.checkParams('memberId', res.t('memberIdRequired')).notEmpty().isUUID();
+    /* await param('memberId', res.t('memberIdRequired')).notEmpty().isUUID().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { memberId } = req.params;
 
@@ -215,10 +215,10 @@ api.exportUserAvatarPng = {
   async handler (/* req, res */) {
     throw new NotFound('This API route is currently not available. See https://github.com/HabitRPG/habitica/issues/9489.');
 
-    /* req.checkParams('memberId', res.t('memberIdRequired')).notEmpty().isUUID();
+    /* await param('memberId', res.t('memberIdRequired')).notEmpty().isUUID().run(req)
 
-    const validationErrors = req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const { memberId } = req.params;
 
diff --git a/website/server/controllers/top-level/email.js b/website/server/controllers/top-level/email.js
index 72074907f1..b2123e7266 100644
--- a/website/server/controllers/top-level/email.js
+++ b/website/server/controllers/top-level/email.js
@@ -13,8 +13,8 @@ async function emailUnsubscribe (req, res) {
       notEmpty: { errorMessage: res.t('missingUnsubscriptionCode') },
     },
   });
-  const validationErrors = req.validationErrors();
-  if (validationErrors) throw validationErrors;
+  const validationErrors = validationResult(req).array();
+  if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
   const data = JSON.parse(decrypt(req.query.code));
 
diff --git a/website/server/libs/auth/index.js b/website/server/libs/auth/index.js
index 15ac763d86..3bb42cc4c7 100644
--- a/website/server/libs/auth/index.js
+++ b/website/server/libs/auth/index.js
@@ -110,8 +110,8 @@ async function registerLocal (req, res, { isV3 = false }) {
     },
   });
 
-  const validationErrors = req.validationErrors();
-  if (validationErrors) throw validationErrors;
+  const validationErrors = validationResult(req).array();
+  if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
   const issues = verifyUsername(req.body.username, res);
   if (issues.length > 0) throw new BadRequest(issues.join(' '));
diff --git a/website/server/libs/challenges/handleGetMembersForChallenge.js b/website/server/libs/challenges/handleGetMembersForChallenge.js
index 26dbfb9b82..b0c197ddf6 100644
--- a/website/server/libs/challenges/handleGetMembersForChallenge.js
+++ b/website/server/libs/challenges/handleGetMembersForChallenge.js
@@ -1,4 +1,5 @@
 import _ from 'lodash';
+import { param, query , validationResult } from 'express-validator';
 import {
   model as User,
   publicFields as memberFields,
@@ -22,13 +23,13 @@ async function getMembersTasksForChallenge (members, challenge) {
 }
 
 export async function handleGetMembersForChallenge (req, res) {
-  req.checkParams('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID();
-  req.checkQuery('lastId').optional().notEmpty().isUUID();
+  await param('challengeId', res.t('challengeIdRequired')).notEmpty().isUUID().run(req);
+  await query('lastId').optional().notEmpty().isUUID().run(req);
   // Allow an arbitrary number of results (up to 60)
-  req.checkQuery('limit', res.t('groupIdRequired')).optional().notEmpty().isInt({ min: 1, max: 60 });
+  await query('limit', res.t('groupIdRequired')).optional().notEmpty().isInt({ min: 1, max: 60 }).run(req);
 
-  const validationErrors = req.validationErrors();
-  if (validationErrors) throw validationErrors;
+  const validationErrors = validationResult(req).array();
+  if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
   const { challengeId } = req.params;
   const { lastId } = req.query;
diff --git a/website/server/libs/chatReporting/groupChatReporter.js b/website/server/libs/chatReporting/groupChatReporter.js
index 2270674259..96de3645c0 100644
--- a/website/server/libs/chatReporting/groupChatReporter.js
+++ b/website/server/libs/chatReporting/groupChatReporter.js
@@ -1,5 +1,6 @@
 import nconf from 'nconf';
 import moment from 'moment';
+import { param , validationResult } from 'express-validator';
 import { getAuthorEmailFromMessage } from '../chat';
 import ChatReporter from './chatReporter';
 import {
@@ -23,11 +24,11 @@ export default class GroupChatReporter extends ChatReporter {
   }
 
   async validate () {
-    this.req.checkParams('groupId', apiError('groupIdRequired')).notEmpty();
-    this.req.checkParams('chatId', apiError('chatIdRequired')).notEmpty();
+    await param('groupId', apiError('groupIdRequired')).notEmpty().run(req)
+    await param('chatId', apiError('chatIdRequired')).notEmpty().run(req)
 
-    const validationErrors = this.req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = this.validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const group = await Group.getGroup({
       user: this.user,
diff --git a/website/server/libs/chatReporting/inboxChatReporter.js b/website/server/libs/chatReporting/inboxChatReporter.js
index cee0309970..c430b6e72e 100644
--- a/website/server/libs/chatReporting/inboxChatReporter.js
+++ b/website/server/libs/chatReporting/inboxChatReporter.js
@@ -1,3 +1,4 @@
+import { param , validationResult } from 'express-validator';
 import { model as User } from '../../models/user';
 
 import ChatReporter from './chatReporter';
@@ -20,10 +21,10 @@ export default class InboxChatReporter extends ChatReporter {
   }
 
   async validate () {
-    this.req.checkParams('messageId', apiError('messageIdRequired')).notEmpty();
+    await param('messageId', apiError('messageIdRequired')).notEmpty().run(req)
 
-    const validationErrors = this.req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = this.validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     if (this.user.hasPermission('moderator') && this.req.query.userId) {
       this.inboxUser = await User.findOne({ _id: this.req.query.userId }).exec();
diff --git a/website/server/libs/chatReporting/profileReporter.js b/website/server/libs/chatReporting/profileReporter.js
index 008146dcf5..09e16ff3a9 100644
--- a/website/server/libs/chatReporting/profileReporter.js
+++ b/website/server/libs/chatReporting/profileReporter.js
@@ -1,5 +1,6 @@
 import { model as User } from '../../models/user';
 import * as slack from '../slack';
+import { param , validationResult } from 'express-validator';
 
 import ChatReporter from './chatReporter';
 import {
@@ -15,10 +16,10 @@ export default class ProfileReporter extends ChatReporter {
   }
 
   async validate () {
-    this.req.checkParams('memberId', this.res.t('memberIdRequired')).notEmpty().isUUID();
+    await param('memberId', this.res.t('memberIdRequired')).notEmpty().isUUID().run(req)
 
-    const validationErrors = this.req.validationErrors();
-    if (validationErrors) throw validationErrors;
+    const validationErrors = this.validationResult(req).array();
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     const flaggedUser = await User.findOne(
       { _id: this.req.params.memberId },
diff --git a/website/server/libs/coupons/index.js b/website/server/libs/coupons/index.js
index 0caf4b1f17..de63fd34d6 100644
--- a/website/server/libs/coupons/index.js
+++ b/website/server/libs/coupons/index.js
@@ -1,10 +1,11 @@
+import { param , validationResult } from 'express-validator';
 import { model as Coupon } from '../../models/coupon';
 
 export async function enterCode (req, res, user) { // eslint-disable-line import/prefer-default-export, max-len
-  req.checkParams('code', res.t('couponCodeRequired')).notEmpty();
+  await param('code', res.t('couponCodeRequired')).notEmpty().run(req)
 
-  const validationErrors = req.validationErrors();
-  if (validationErrors) throw validationErrors;
+  const validationErrors = validationResult(req).array();
+  if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
   await Coupon.apply(user, req, req.params.code);
 }
diff --git a/website/server/libs/spells.js b/website/server/libs/spells.js
index 8d7158c25c..b55c93bd40 100644
--- a/website/server/libs/spells.js
+++ b/website/server/libs/spells.js
@@ -1,3 +1,5 @@
+
+import { query, validationResult } from 'express-validator';
 import { model as User } from '../models/user';
 import { chatModel as Chat } from '../models/message';
 import * as Tasks from '../models/task';
@@ -157,9 +159,9 @@ async function castSpell (req, res, { isV3 = false }) {
   const quantity = req.body.quantity || 1;
 
   // optional because not required by all targetTypes, presence is checked later if necessary
-  req.checkQuery('targetId', res.t('targetIdUUID')).optional().isUUID();
+  await query('targetId', res.t('targetIdUUID')).optional().isUUID().run(req)
 
-  const reqValidationErrors = req.validationErrors();
+  const reqValidationErrors = validationResult(req).array();
   if (reqValidationErrors) throw reqValidationErrors;
 
   const klass = common.content.spells.special[spellId] ? 'special' : user.stats.class;
diff --git a/website/server/libs/tasks/index.js b/website/server/libs/tasks/index.js
index 2b4c07464b..f5454b378c 100644
--- a/website/server/libs/tasks/index.js
+++ b/website/server/libs/tasks/index.js
@@ -97,7 +97,7 @@ async function createTasks (req, res, options = {}) {
     // and task in parallel it could save the user/challenge/group
     // with a tasksOrder that doens't match reality
     const validationErrors = newTask.validateSync();
-    if (validationErrors) throw validationErrors;
+    if (validationErrors && validationErrors.length > 0) throw validationErrors;
 
     // Otherwise update the user/challenge/group
     if (!taskOrderToAdd[`${taskType}s`]) taskOrderToAdd[`${taskType}s`] = [];
diff --git a/website/server/middlewares/appRoutes.js b/website/server/middlewares/appRoutes.js
index 19931eab6b..8af5d35356 100644
--- a/website/server/middlewares/appRoutes.js
+++ b/website/server/middlewares/appRoutes.js
@@ -1,5 +1,4 @@
 import express from 'express';
-import expressValidator from 'express-validator';
 import path from 'path';
 import analytics from './analytics';
 import setupBody from './setupBody';
@@ -16,7 +15,6 @@ const app = express();
 // re-set the view options because they are not inherited from the top level app
 setupExpress(app);
 
-app.use(expressValidator());
 app.use(analytics);
 app.use(setupBody);
 
diff --git a/website/server/middlewares/errorHandler.js b/website/server/middlewares/errorHandler.js
index 9480752517..ca1ab2dfaa 100644
--- a/website/server/middlewares/errorHandler.js
+++ b/website/server/middlewares/errorHandler.js
@@ -27,11 +27,11 @@ export default function errorHandler (err, req, res, next) { // eslint-disable-l
   }
 
   // Handle errors by express-validator
-  if (Array.isArray(err) && err[0].param && err[0].msg) {
+  if (Array.isArray(err) && err.length >= 1 && err[0].path && err[0].msg) {
     responseErr = new BadRequest(res.t('invalidReqParams'));
     responseErr.errors = err.map(paramErr => ({
       message: paramErr.msg,
-      param: paramErr.param,
+      param: paramErr.path,
       value: paramErr.value,
     }));
   }
@@ -66,7 +66,7 @@ export default function errorHandler (err, req, res, next) { // eslint-disable-l
     responseErr = new InternalServerError();
   }
 
-  if (!err.skipLogging) {
+  if (!err.skipLogging && err instanceof Error) {
     // log the error
     logger.error(err, {
       method: req.method,
diff --git a/website/server/middlewares/v1.js b/website/server/middlewares/v1.js
index 2362b7cb97..0e6c34ab68 100644
--- a/website/server/middlewares/v1.js
+++ b/website/server/middlewares/v1.js
@@ -11,7 +11,7 @@ const router = express.Router(); // eslint-disable-line new-cap
 
 const BASE_URL = nconf.get('BASE_URL');
 
-router.all('*', (req, res, next) => {
+router.all('*route', (req, res, next) => {
   const error = new NotFound(`API v1 is no longer supported, please use API v3 instead (${BASE_URL}/apidoc).`);
   return next(error);
 });
diff --git a/website/server/middlewares/v2.js b/website/server/middlewares/v2.js
index 5e2b012f07..b9074f23d6 100644
--- a/website/server/middlewares/v2.js
+++ b/website/server/middlewares/v2.js
@@ -11,7 +11,7 @@ const router = express.Router(); // eslint-disable-line new-cap
 
 const BASE_URL = nconf.get('BASE_URL');
 
-router.all('*', (req, res, next) => {
+router.all('*route', (req, res, next) => {
   const error = new NotFound(`API v2 is no longer supported, please use API v3 instead (${BASE_URL}/apidoc).`);
   return next(error);
 });