diff --git a/common/script/api-v3/scoreTask.js b/common/script/api-v3/scoreTask.js
index 57ee6914e2..f0244571f5 100644
--- a/common/script/api-v3/scoreTask.js
+++ b/common/script/api-v3/scoreTask.js
@@ -166,7 +166,7 @@ function _changeTaskValue (user, task, direction, times, cron) {
   return addToDelta;
 }
 
-export default function scoreTask (options = {}, req = {}) {
+module.exports = function scoreTask (options = {}, req = {}) {
   let {user, task, direction, times = 1, cron = false} = options;
   let delta = 0;
   let stats = {
@@ -247,4 +247,4 @@ export default function scoreTask (options = {}, req = {}) {
 
   user.fns.updateStats(stats, req);
   return delta;
-}
+};
diff --git a/website/src/controllers/api-v3/auth.js b/website/src/controllers/api-v3/auth.js
index 6ccf7a21c3..ad3c26bbdd 100644
--- a/website/src/controllers/api-v3/auth.js
+++ b/website/src/controllers/api-v3/auth.js
@@ -342,4 +342,4 @@ api.logout = {
   },
 };
 
-export default api;
+module.exports = api;
diff --git a/website/src/controllers/api-v3/challenges.js b/website/src/controllers/api-v3/challenges.js
index 5102da8975..632c36bd3f 100644
--- a/website/src/controllers/api-v3/challenges.js
+++ b/website/src/controllers/api-v3/challenges.js
@@ -565,4 +565,4 @@ api.selectChallengeWinner = {
   },
 };
 
-export default api;
+module.exports = api;
diff --git a/website/src/controllers/api-v3/chat.js b/website/src/controllers/api-v3/chat.js
index e60ba380a8..d2b7358643 100644
--- a/website/src/controllers/api-v3/chat.js
+++ b/website/src/controllers/api-v3/chat.js
@@ -392,4 +392,4 @@ api.deleteChat = {
   },
 };
 
-export default api;
+module.exports = api;
diff --git a/website/src/controllers/api-v3/dataexport.js b/website/src/controllers/api-v3/dataexport.js
index dca4e5eae3..81f257cb58 100644
--- a/website/src/controllers/api-v3/dataexport.js
+++ b/website/src/controllers/api-v3/dataexport.js
@@ -226,4 +226,4 @@ api.exportUserAvatarPng = {
   },
 };
 
-export default api;
+module.exports = api;
diff --git a/website/src/controllers/api-v3/email.js b/website/src/controllers/api-v3/email.js
index 4f642d02d6..7d4e2cbb83 100644
--- a/website/src/controllers/api-v3/email.js
+++ b/website/src/controllers/api-v3/email.js
@@ -51,4 +51,4 @@ api.unsubscribe = {
   },
 };
 
-export default api;
+module.exports = api;
diff --git a/website/src/controllers/api-v3/groups.js b/website/src/controllers/api-v3/groups.js
index 54fd971f7d..372e0c61fc 100644
--- a/website/src/controllers/api-v3/groups.js
+++ b/website/src/controllers/api-v3/groups.js
@@ -497,12 +497,12 @@ async function _inviteByUUID (uuid, group, inviter, req, res) {
     if (group.type === 'guild') {
       emailVars.push(
         {name: 'GUILD_NAME', content: group.name},
-        {name: 'GUILD_URL', content: '/#/options/groups/guilds/public'},
+        {name: 'GUILD_URL', content: '/#/options/groups/guilds/public'}
       );
     } else {
       emailVars.push(
         {name: 'PARTY_NAME', content: group.name},
-        {name: 'PARTY_URL', content: '/#/options/groups/party'},
+        {name: 'PARTY_URL', content: '/#/options/groups/party'}
       );
     }
 
@@ -642,4 +642,4 @@ api.inviteToGroup = {
   },
 };
 
-export default api;
+module.exports = api;
diff --git a/website/src/controllers/api-v3/hall.js b/website/src/controllers/api-v3/hall.js
index 57454c038d..917b3e487a 100644
--- a/website/src/controllers/api-v3/hall.js
+++ b/website/src/controllers/api-v3/hall.js
@@ -189,4 +189,4 @@ api.updateHero = {
   },
 };
 
-export default api;
+module.exports = api;
diff --git a/website/src/controllers/api-v3/members.js b/website/src/controllers/api-v3/members.js
index 85449ecc79..ad42fe5e8d 100644
--- a/website/src/controllers/api-v3/members.js
+++ b/website/src/controllers/api-v3/members.js
@@ -231,4 +231,4 @@ api.getChallengeMemberProgress = {
   },
 };
 
-export default api;
+module.exports = api;
diff --git a/website/src/controllers/api-v3/meta/modelsPaths.js b/website/src/controllers/api-v3/meta/modelsPaths.js
index 895bc5aa8d..657f7c6e6a 100644
--- a/website/src/controllers/api-v3/meta/modelsPaths.js
+++ b/website/src/controllers/api-v3/meta/modelsPaths.js
@@ -36,4 +36,4 @@ api.getModelPaths = {
   },
 };
 
-export default api;
+module.exports = api;
diff --git a/website/src/controllers/api-v3/quests.js b/website/src/controllers/api-v3/quests.js
index f2a95db29f..28adfff1d6 100644
--- a/website/src/controllers/api-v3/quests.js
+++ b/website/src/controllers/api-v3/quests.js
@@ -448,4 +448,4 @@ api.leaveQuest = {
   },
 };
 
-export default api;
+module.exports = api;
diff --git a/website/src/controllers/api-v3/tags.js b/website/src/controllers/api-v3/tags.js
index 27191bf0ee..36d96c7bb6 100644
--- a/website/src/controllers/api-v3/tags.js
+++ b/website/src/controllers/api-v3/tags.js
@@ -144,4 +144,4 @@ api.deleteTag = {
   },
 };
 
-export default api;
+module.exports = api;
diff --git a/website/src/controllers/api-v3/tasks.js b/website/src/controllers/api-v3/tasks.js
index ffd3b15903..a58ac0a628 100644
--- a/website/src/controllers/api-v3/tasks.js
+++ b/website/src/controllers/api-v3/tasks.js
@@ -923,4 +923,4 @@ api.deleteTask = {
   },
 };
 
-export default api;
+module.exports = api;
diff --git a/website/src/controllers/api-v3/user.js b/website/src/controllers/api-v3/user.js
index 2925a828cc..9e639d8b43 100644
--- a/website/src/controllers/api-v3/user.js
+++ b/website/src/controllers/api-v3/user.js
@@ -156,4 +156,4 @@ api.castSpell = {
   },
 };
 
-export default api;
+module.exports = api;
diff --git a/website/src/libs/api-v3/analyticsService.js b/website/src/libs/api-v3/analyticsService.js
index 2c435da9dd..ae3ec9f507 100644
--- a/website/src/libs/api-v3/analyticsService.js
+++ b/website/src/libs/api-v3/analyticsService.js
@@ -231,7 +231,7 @@ let mockAnalyticsService = {
   trackPurchase: () => { },
 };
 
-export default {
+module.exports = {
   track,
   trackPurchase,
   mockAnalyticsService,
diff --git a/website/src/libs/api-v3/baseModel.js b/website/src/libs/api-v3/baseModel.js
index c7875349f5..e1b69216b6 100644
--- a/website/src/libs/api-v3/baseModel.js
+++ b/website/src/libs/api-v3/baseModel.js
@@ -3,7 +3,7 @@ import validator from 'validator';
 import objectPath from 'object-path'; // TODO use lodash's unset once v4 is out
 import _ from 'lodash';
 
-export default function baseModel (schema, options = {}) {
+module.exports = function baseModel (schema, options = {}) {
   schema.add({
     _id: {
       type: String,
@@ -67,4 +67,4 @@ export default function baseModel (schema, options = {}) {
       return result;
     }, {});
   };
-}
+};
diff --git a/website/src/libs/api-v3/csvStringify.js b/website/src/libs/api-v3/csvStringify.js
index 3a597ff55c..da87ca33f2 100644
--- a/website/src/libs/api-v3/csvStringify.js
+++ b/website/src/libs/api-v3/csvStringify.js
@@ -1,11 +1,11 @@
 import csvStringify from 'csv-stringify';
 import Q from 'q';
 
-export default function (input) {
+module.exports = (input) => {
   return Q.promise((resolve, reject) => {
     csvStringify(input, (err, output) => {
       if (err) return reject(err);
       return resolve(output);
     });
   });
-}
+};
diff --git a/website/src/libs/api-v3/logger.js b/website/src/libs/api-v3/logger.js
index 4825339c1f..37f5128fbf 100644
--- a/website/src/libs/api-v3/logger.js
+++ b/website/src/libs/api-v3/logger.js
@@ -21,4 +21,4 @@ if (IS_PROD) {
     });
 }
 
-export default logger;
+module.exports = logger;
diff --git a/website/src/libs/api-v3/pushNotifications.js b/website/src/libs/api-v3/pushNotifications.js
index f2f7825477..edd10c3d2f 100644
--- a/website/src/libs/api-v3/pushNotifications.js
+++ b/website/src/libs/api-v3/pushNotifications.js
@@ -25,7 +25,7 @@ if (gcm) {
 }
 
 // TODO test
-export default function sendNotification (user, title, message, timeToLive = 15) {
+module.exports = function sendNotification (user, title, message, timeToLive = 15) {
   // TODO need investigation:
   // https://github.com/HabitRPG/habitrpg/issues/5252
 
@@ -54,4 +54,4 @@ export default function sendNotification (user, title, message, timeToLive = 15)
         break;
     }
   });
-}
+};
diff --git a/website/src/libs/api-v3/setupNconf.js b/website/src/libs/api-v3/setupNconf.js
index f55f593bad..d88b04014e 100644
--- a/website/src/libs/api-v3/setupNconf.js
+++ b/website/src/libs/api-v3/setupNconf.js
@@ -3,7 +3,7 @@ import { join, resolve } from 'path';
 
 const PATH_TO_CONFIG = join(resolve(__dirname, '../../../../config.json'));
 
-export default function setupNconf (file) {
+module.exports = function setupNconf (file) {
   let configFile = file || PATH_TO_CONFIG;
 
   nconf
@@ -14,4 +14,4 @@ export default function setupNconf (file) {
   nconf.set('IS_PROD', nconf.get('NODE_ENV') === 'production');
   nconf.set('IS_DEV', nconf.get('NODE_ENV') === 'development');
   nconf.set('IS_TEST', nconf.get('NODE_ENV') === 'test');
-}
+};
diff --git a/website/src/libs/api-v3/setupRoutes.js b/website/src/libs/api-v3/setupRoutes.js
index 05786a1287..99dca871a9 100644
--- a/website/src/libs/api-v3/setupRoutes.js
+++ b/website/src/libs/api-v3/setupRoutes.js
@@ -31,4 +31,4 @@ function walkControllers (filePath) {
 
 walkControllers(CONTROLLERS_PATH);
 
-export default router;
+module.exports = router;
diff --git a/website/src/middlewares/api-v3/analytics.js b/website/src/middlewares/api-v3/analytics.js
index e4872fad56..8512d16011 100644
--- a/website/src/middlewares/api-v3/analytics.js
+++ b/website/src/middlewares/api-v3/analytics.js
@@ -16,8 +16,8 @@ if (nconf.get('IS_PROD')) {
   service = mockAnalyticsService;
 }
 
-export default function attachAnalytics (req, res, next) {
+module.exports = function attachAnalytics (req, res, next) {
   res.analytics = service;
 
   next();
-}
+};
diff --git a/website/src/middlewares/api-v3/cron.js b/website/src/middlewares/api-v3/cron.js
index d57bfb28f8..9b5042caf2 100644
--- a/website/src/middlewares/api-v3/cron.js
+++ b/website/src/middlewares/api-v3/cron.js
@@ -269,7 +269,7 @@ export function cron (options = {}) {
 }
 
 // TODO check that it's used everywhere
-export default async function cronMiddleware (req, res, next) {
+module.exports = async function cronMiddleware (req, res, next) {
   let user = res.locals.user;
   let analytics = res.analytics;
 
@@ -335,4 +335,4 @@ export default async function cronMiddleware (req, res, next) {
     .then(() => next())
     .catch(next);
   });
-}
+};
diff --git a/website/src/middlewares/api-v3/domain.js b/website/src/middlewares/api-v3/domain.js
index 63272381da..fe9d6cd462 100644
--- a/website/src/middlewares/api-v3/domain.js
+++ b/website/src/middlewares/api-v3/domain.js
@@ -3,7 +3,7 @@
 // it's yet to be decided whether to keep it or not
 import domainMiddleware from 'domain-middleware';
 
-export default function implementDomainMiddleware (server, mongoose) {
+module.exports = function implementDomainMiddleware (server, mongoose) {
   return domainMiddleware({
     server: {
       close () {
@@ -13,4 +13,4 @@ export default function implementDomainMiddleware (server, mongoose) {
     },
     killTimeout: 10000,
   });
-}
\ No newline at end of file
+};
diff --git a/website/src/middlewares/api-v3/errorHandler.js b/website/src/middlewares/api-v3/errorHandler.js
index 2c49252384..65c1bd935d 100644
--- a/website/src/middlewares/api-v3/errorHandler.js
+++ b/website/src/middlewares/api-v3/errorHandler.js
@@ -8,7 +8,7 @@ import {
 } from '../../libs/api-v3/errors';
 import { map } from 'lodash';
 
-export default function errorHandler (err, req, res, next) { // eslint-disable-line no-unused-vars
+module.exports = function errorHandler (err, req, res, next) { // eslint-disable-line no-unused-vars
   // Log the original error with some metadata
   let stack = err.stack || err.message || err;
 
@@ -77,4 +77,4 @@ export default function errorHandler (err, req, res, next) { // eslint-disable-l
   // In some occasions like when invalid JSON is supplied `res.respond` might be not yet avalaible,
   // in this case we use the standard res.status(...).json(...)
   return res.respond ? res.respond(responseErr.httpCode, jsonRes) : res.status(responseErr.httpCode).json(jsonRes);
-}
+};
diff --git a/website/src/middlewares/api-v3/getUserLanguage.js b/website/src/middlewares/api-v3/getUserLanguage.js
index ef957ee03c..086121b26b 100644
--- a/website/src/middlewares/api-v3/getUserLanguage.js
+++ b/website/src/middlewares/api-v3/getUserLanguage.js
@@ -64,7 +64,7 @@ function _attachTranslateFunction (req, res, next) {
   next();
 }
 
-export default function getUserLanguage (req, res, next) {
+module.exports = function getUserLanguage (req, res, next) {
   if (req.query.lang) { // In case the language is specified in the request url, use it
     req.language = translations[req.query.lang] ? req.query.lang : 'en';
     return _attachTranslateFunction(...arguments);
@@ -85,4 +85,4 @@ export default function getUserLanguage (req, res, next) {
     req.language = _getFromUser(null, req);
     return _attachTranslateFunction(...arguments);
   }
-}
+};
diff --git a/website/src/middlewares/api-v3/index.js b/website/src/middlewares/api-v3/index.js
index dd186c11fb..4f4349944d 100644
--- a/website/src/middlewares/api-v3/index.js
+++ b/website/src/middlewares/api-v3/index.js
@@ -18,7 +18,7 @@ const DISABLE_LOGGING = nconf.get('DISABLE_REQUEST_LOGGING');
 const SESSION_SECRET = nconf.get('SESSION_SECRET');
 const TWO_WEEKS = 1000 * 60 * 60 * 24 * 14;
 
-export default function attachMiddlewares (app) {
+module.exports = function attachMiddlewares (app) {
   if (!IS_PROD && !DISABLE_LOGGING) app.use(morgan('dev'));
 
   // TODO handle errors
@@ -45,4 +45,4 @@ export default function attachMiddlewares (app) {
 
   // Error handler middleware, define as the last one
   app.use(errorHandler);
-}
+};
diff --git a/website/src/middlewares/api-v3/locals.js b/website/src/middlewares/api-v3/locals.js
index 43b4f5f00a..31e41c44f0 100644
--- a/website/src/middlewares/api-v3/locals.js
+++ b/website/src/middlewares/api-v3/locals.js
@@ -37,7 +37,7 @@ let env = {
   env[key] = nconf.get(key);
 });
 
-export default function locals (req, res, next) {
+module.exports = function locals (req, res, next) {
   let language = _.find(i18n.availableLanguages, {code: req.language});
   let isStaticPage = req.url.split('/')[1] === 'static'; // If url contains '/static/'
 
@@ -59,4 +59,4 @@ export default function locals (req, res, next) {
   });
 
   next();
-}
+};
diff --git a/website/src/middlewares/api-v3/notFound.js b/website/src/middlewares/api-v3/notFound.js
index 733a247d1d..6a71b5def4 100644
--- a/website/src/middlewares/api-v3/notFound.js
+++ b/website/src/middlewares/api-v3/notFound.js
@@ -2,6 +2,6 @@ import {
   NotFound,
 } from '../../libs/api-v3/errors';
 
-export default function (req, res, next) {
+module.exports = function NotFoundMiddleware (req, res, next) {
   next(new NotFound());
-}
+};
diff --git a/website/src/middlewares/api-v3/response.js b/website/src/middlewares/api-v3/response.js
index 707d7ad0bf..a3a84fd818 100644
--- a/website/src/middlewares/api-v3/response.js
+++ b/website/src/middlewares/api-v3/response.js
@@ -1,7 +1,7 @@
-export default function responseHandler (req, res, next) {
+module.exports = function responseHandler (req, res, next) {
   res.respond = function respond (status = 200, data = {}) {
     res.status(status).json(data);
   };
 
   next();
-}
+};
diff --git a/website/src/middlewares/api-v3/setupBody.js b/website/src/middlewares/api-v3/setupBody.js
index 82e1b798bb..846db4162c 100644
--- a/website/src/middlewares/api-v3/setupBody.js
+++ b/website/src/middlewares/api-v3/setupBody.js
@@ -1,5 +1,5 @@
 // TODO tests?
-export default function setupBodyMiddleware (req, res, next) {
+module.exports = function setupBodyMiddleware (req, res, next) {
   req.body = req.body || {};
   next();
-}
+};
diff --git a/website/src/middlewares/api-v3/static.js b/website/src/middlewares/api-v3/static.js
index f944e1e301..eda3a9e39d 100644
--- a/website/src/middlewares/api-v3/static.js
+++ b/website/src/middlewares/api-v3/static.js
@@ -7,7 +7,7 @@ const MAX_AGE = IS_PROD ? 31536000000 : 0;
 const PUBLIC_DIR = path.join(__dirname, '/../../../public');
 const BUILD_DIR = path.join(__dirname, '/../../../build');
 
-export default function staticMiddleware (expressApp) {
+module.exports = function staticMiddleware (expressApp) {
   // TODO move all static files to a single location (one for public and one for build)
   expressApp.use(express.static(BUILD_DIR, { maxAge: MAX_AGE }));
   expressApp.use('/common/dist', express.static(`${PUBLIC_DIR}/../../common/dist`, { maxAge: MAX_AGE }));
@@ -15,4 +15,4 @@ export default function staticMiddleware (expressApp) {
   expressApp.use('/common/script/public', express.static(`${PUBLIC_DIR}/../../common/script/public`, { maxAge: MAX_AGE }));
   expressApp.use('/common/img', express.static(`${PUBLIC_DIR}/../../common/img`, { maxAge: MAX_AGE }));
   expressApp.use(express.static(PUBLIC_DIR));
-}
+};
diff --git a/website/src/models/group.js b/website/src/models/group.js
index 991a7c9621..cdc1ced495 100644
--- a/website/src/models/group.js
+++ b/website/src/models/group.js
@@ -316,8 +316,8 @@ schema.methods.startQuest = async function startQuest (user) {
   // send notifications in the background without blocking
   User.find(
     { _id: { $in: nonUserQuestMembers } },
-    'party.quest items.quests auth.facebook auth.local preferences.emailNotifications pushDevices profile.name',
-  ).exec().then(membersToNotify => {
+    'party.quest items.quests auth.facebook auth.local preferences.emailNotifications pushDevices profile.name'
+  ).exec().then((membersToNotify) => {
     let membersToEmail = _.filter(membersToNotify, (member) => {
       // send push notifications and filter users that disabled emails
       sendPushNotification(member, 'HabitRPG', `${shared.i18n.t('questStarted')}: ${quest.text()}`);
diff --git a/website/src/server.js b/website/src/server.js
index 3f4de12bdf..81a36b2dc4 100644
--- a/website/src/server.js
+++ b/website/src/server.js
@@ -167,4 +167,4 @@ server.listen(app.get('port'), () => {
   return logger.info(`Express server listening on port ${app.get('port')}`);
 });
 
-export default server;
+module.exports = server;