diff --git a/libraries/settings/Settings.js b/libraries/settings/Settings.js
index e710a0d4f6..358b83b52a 100644
--- a/libraries/settings/Settings.js
+++ b/libraries/settings/Settings.js
@@ -13,7 +13,9 @@ const SHARELATEX_CONFIG = process.env.SHARELATEX_CONFIG
 let settings
 let settingsExist = false
 const defaultsPath =
+  pathIfExists(Path.join(CWD, 'config/settings.defaults.cjs')) ||
   pathIfExists(Path.join(CWD, 'config/settings.defaults.js')) ||
+  pathIfExists(Path.join(ENTRY_POINT_DIR, 'config/settings.defaults.cjs')) ||
   pathIfExists(Path.join(ENTRY_POINT_DIR, 'config/settings.defaults.js'))
 if (defaultsPath) {
   console.log(`Using default settings from ${defaultsPath}`)
@@ -25,6 +27,7 @@ if (defaultsPath) {
 
 const overridesPath =
   pathIfExists(SHARELATEX_CONFIG) ||
+  pathIfExists(Path.join(CWD, `config/settings.${NODE_ENV}.cjs`)) ||
   pathIfExists(Path.join(CWD, `config/settings.${NODE_ENV}.js`))
 if (overridesPath) {
   console.log(`Using settings from ${overridesPath}`)
diff --git a/services/chat/app.js b/services/chat/app.js
index 80e58a7a8f..ca3ea09426 100644
--- a/services/chat/app.js
+++ b/services/chat/app.js
@@ -1,28 +1,22 @@
-const logger = require('@overleaf/logger')
-const settings = require('@overleaf/settings')
+import logger from '@overleaf/logger'
+import settings from '@overleaf/settings'
+import { mongoClient } from './app/js/mongodb.js'
+import { server } from './app/js/server.js'
 
-const { mongoClient } = require('./app/js/mongodb')
-const Server = require('./app/js/server')
-
-if (!module.parent) {
-  // Called directly
-  const port = settings.internal.chat.port
-  const host = settings.internal.chat.host
-  mongoClient
-    .connect()
-    .then(() => {
-      Server.server.listen(port, host, function (err) {
-        if (err) {
-          logger.fatal({ err }, `Cannot bind to ${host}:${port}. Exiting.`)
-          process.exit(1)
-        }
-        logger.debug(`Chat starting up, listening on ${host}:${port}`)
-      })
+const port = settings.internal.chat.port
+const host = settings.internal.chat.host
+mongoClient
+  .connect()
+  .then(() => {
+    server.listen(port, host, function (err) {
+      if (err) {
+        logger.fatal({ err }, `Cannot bind to ${host}:${port}. Exiting.`)
+        process.exit(1)
+      }
+      logger.debug(`Chat starting up, listening on ${host}:${port}`)
     })
-    .catch(err => {
-      logger.fatal({ err }, 'Cannot connect to mongo. Exiting.')
-      process.exit(1)
-    })
-}
-
-module.exports = Server.server
+  })
+  .catch(err => {
+    logger.fatal({ err }, 'Cannot connect to mongo. Exiting.')
+    process.exit(1)
+  })
diff --git a/services/chat/app/js/Features/Messages/MessageFormatter.js b/services/chat/app/js/Features/Messages/MessageFormatter.js
index 373087aea5..31e9300e9e 100644
--- a/services/chat/app/js/Features/Messages/MessageFormatter.js
+++ b/services/chat/app/js/Features/Messages/MessageFormatter.js
@@ -1,4 +1,4 @@
-function formatMessageForClientSide(message) {
+export function formatMessageForClientSide(message) {
   if (message._id) {
     message.id = message._id.toString()
     delete message._id
@@ -15,11 +15,11 @@ function formatMessageForClientSide(message) {
   return formattedMessage
 }
 
-function formatMessagesForClientSide(messages) {
+export function formatMessagesForClientSide(messages) {
   return messages.map(message => formatMessageForClientSide(message))
 }
 
-function groupMessagesByThreads(rooms, messages) {
+export function groupMessagesByThreads(rooms, messages) {
   let room, thread
   const roomsById = {}
   for (room of rooms) {
@@ -58,9 +58,3 @@ function groupMessagesByThreads(rooms, messages) {
 
   return threads
 }
-
-module.exports = {
-  formatMessagesForClientSide,
-  formatMessageForClientSide,
-  groupMessagesByThreads,
-}
diff --git a/services/chat/app/js/Features/Messages/MessageHttpController.js b/services/chat/app/js/Features/Messages/MessageHttpController.js
index e05dacf611..7ccf63bb97 100644
--- a/services/chat/app/js/Features/Messages/MessageHttpController.js
+++ b/services/chat/app/js/Features/Messages/MessageHttpController.js
@@ -1,26 +1,26 @@
-const logger = require('@overleaf/logger')
-const MessageManager = require('./MessageManager')
-const MessageFormatter = require('./MessageFormatter')
-const ThreadManager = require('../Threads/ThreadManager')
-const { ObjectId } = require('../../mongodb')
-const { expressify } = require('../../util/promises')
+import logger from '@overleaf/logger'
+import * as MessageManager from './MessageManager.js'
+import * as MessageFormatter from './MessageFormatter.js'
+import * as ThreadManager from '../Threads/ThreadManager.js'
+import { ObjectId } from '../../mongodb.js'
+import { expressify } from '../../util/promises.js'
 
 const DEFAULT_MESSAGE_LIMIT = 50
 const MAX_MESSAGE_LENGTH = 10 * 1024 // 10kb, about 1,500 words
 
-async function getGlobalMessages(req, res) {
+export const getGlobalMessages = expressify(async (req, res) => {
   await _getMessages(ThreadManager.GLOBAL_THREAD, req, res)
-}
+})
 
-async function sendGlobalMessage(req, res) {
+export const sendGlobalMessage = expressify(async (req, res) => {
   await _sendMessage(ThreadManager.GLOBAL_THREAD, req, res)
-}
+})
 
-async function sendThreadMessage(req, res) {
+export const sendThreadMessage = expressify(async (req, res) => {
   await _sendMessage(req.params.threadId, req, res)
-}
+})
 
-async function getAllThreads(req, res) {
+export const getAllThreads = expressify(async (req, res) => {
   const { projectId } = req.params
   logger.debug({ projectId }, 'getting all threads')
   const rooms = await ThreadManager.findAllThreadRooms(projectId)
@@ -28,32 +28,32 @@ async function getAllThreads(req, res) {
   const messages = await MessageManager.findAllMessagesInRooms(roomIds)
   const threads = MessageFormatter.groupMessagesByThreads(rooms, messages)
   res.json(threads)
-}
+})
 
-async function resolveThread(req, res) {
+export const resolveThread = expressify(async (req, res) => {
   const { projectId, threadId } = req.params
   const { user_id: userId } = req.body
   logger.debug({ userId, projectId, threadId }, 'marking thread as resolved')
   await ThreadManager.resolveThread(projectId, threadId, userId)
   res.sendStatus(204)
-}
+})
 
-async function reopenThread(req, res) {
+export const reopenThread = expressify(async (req, res) => {
   const { projectId, threadId } = req.params
   logger.debug({ projectId, threadId }, 'reopening thread')
   await ThreadManager.reopenThread(projectId, threadId)
   res.sendStatus(204)
-}
+})
 
-async function deleteThread(req, res) {
+export const deleteThread = expressify(async (req, res) => {
   const { projectId, threadId } = req.params
   logger.debug({ projectId, threadId }, 'deleting thread')
   const roomId = await ThreadManager.deleteThread(projectId, threadId)
   await MessageManager.deleteAllMessagesInRoom(roomId)
   res.sendStatus(204)
-}
+})
 
-async function editMessage(req, res) {
+export const editMessage = expressify(async (req, res) => {
   const { content, userId } = req.body
   const { projectId, threadId, messageId } = req.params
   logger.debug({ projectId, threadId, messageId, content }, 'editing message')
@@ -69,17 +69,17 @@ async function editMessage(req, res) {
     return res.sendStatus(404)
   }
   res.sendStatus(204)
-}
+})
 
-async function deleteMessage(req, res) {
+export const deleteMessage = expressify(async (req, res) => {
   const { projectId, threadId, messageId } = req.params
   logger.debug({ projectId, threadId, messageId }, 'deleting message')
   const room = await ThreadManager.findOrCreateThread(projectId, threadId)
   await MessageManager.deleteMessage(room._id, messageId)
   res.sendStatus(204)
-}
+})
 
-async function destroyProject(req, res) {
+export const destroyProject = expressify(async (req, res) => {
   const { projectId } = req.params
   logger.debug({ projectId }, 'destroying project')
   const rooms = await ThreadManager.findAllThreadRoomsAndGlobalThread(projectId)
@@ -89,7 +89,7 @@ async function destroyProject(req, res) {
   logger.debug({ projectId }, 'deleting all threads in project')
   await ThreadManager.deleteAllThreadsInProject(projectId)
   res.sendStatus(204)
-}
+})
 
 async function _sendMessage(clientThreadId, req, res) {
   const { user_id: userId, content } = req.body
@@ -155,16 +155,3 @@ async function _getMessages(clientThreadId, req, res) {
   logger.debug({ projectId, messages }, 'got messages')
   res.status(200).send(messages)
 }
-
-module.exports = {
-  getGlobalMessages: expressify(getGlobalMessages),
-  sendGlobalMessage: expressify(sendGlobalMessage),
-  sendThreadMessage: expressify(sendThreadMessage),
-  getAllThreads: expressify(getAllThreads),
-  resolveThread: expressify(resolveThread),
-  reopenThread: expressify(reopenThread),
-  deleteThread: expressify(deleteThread),
-  editMessage: expressify(editMessage),
-  deleteMessage: expressify(deleteMessage),
-  destroyProject: expressify(destroyProject),
-}
diff --git a/services/chat/app/js/Features/Messages/MessageManager.js b/services/chat/app/js/Features/Messages/MessageManager.js
index 30a5627e84..db521a7896 100644
--- a/services/chat/app/js/Features/Messages/MessageManager.js
+++ b/services/chat/app/js/Features/Messages/MessageManager.js
@@ -1,9 +1,6 @@
-let MessageManager
-const { db, ObjectId } = require('../../mongodb')
-const metrics = require('@overleaf/metrics')
-const logger = require('@overleaf/logger')
+import { db, ObjectId } from '../../mongodb.js'
 
-async function createMessage(roomId, userId, content, timestamp) {
+export async function createMessage(roomId, userId, content, timestamp) {
   let newMessageOpts = {
     content,
     room_id: roomId,
@@ -16,7 +13,7 @@ async function createMessage(roomId, userId, content, timestamp) {
   return newMessageOpts
 }
 
-async function getMessages(roomId, limit, before) {
+export async function getMessages(roomId, limit, before) {
   let query = { room_id: roomId }
   if (before) {
     query.timestamp = { $lt: before }
@@ -25,7 +22,7 @@ async function getMessages(roomId, limit, before) {
   return db.messages.find(query).sort({ timestamp: -1 }).limit(limit).toArray()
 }
 
-async function findAllMessagesInRooms(roomIds) {
+export async function findAllMessagesInRooms(roomIds) {
   return db.messages
     .find({
       room_id: { $in: roomIds },
@@ -33,19 +30,25 @@ async function findAllMessagesInRooms(roomIds) {
     .toArray()
 }
 
-async function deleteAllMessagesInRoom(roomId) {
+export async function deleteAllMessagesInRoom(roomId) {
   await db.messages.deleteMany({
     room_id: roomId,
   })
 }
 
-async function deleteAllMessagesInRooms(roomIds) {
+export async function deleteAllMessagesInRooms(roomIds) {
   await db.messages.deleteMany({
     room_id: { $in: roomIds },
   })
 }
 
-async function updateMessage(roomId, messageId, userId, content, timestamp) {
+export async function updateMessage(
+  roomId,
+  messageId,
+  userId,
+  content,
+  timestamp
+) {
   const query = _ensureIdsAreObjectIds({
     _id: messageId,
     room_id: roomId,
@@ -62,7 +65,7 @@ async function updateMessage(roomId, messageId, userId, content, timestamp) {
   return res.modifiedCount === 1
 }
 
-async function deleteMessage(roomId, messageId) {
+export async function deleteMessage(roomId, messageId) {
   const query = _ensureIdsAreObjectIds({
     _id: messageId,
     room_id: roomId,
@@ -82,27 +85,3 @@ function _ensureIdsAreObjectIds(query) {
   }
   return query
 }
-
-module.exports = MessageManager = {
-  createMessage,
-  getMessages,
-  findAllMessagesInRooms,
-  deleteAllMessagesInRoom,
-  deleteAllMessagesInRooms,
-  updateMessage,
-  deleteMessage,
-}
-;[
-  'createMessage',
-  'getMessages',
-  'findAllMessagesInRooms',
-  'updateMessage',
-  'deleteMessage',
-].map(method =>
-  metrics.timeAsyncMethod(
-    MessageManager,
-    method,
-    'mongo.MessageManager',
-    logger
-  )
-)
diff --git a/services/chat/app/js/Features/Threads/ThreadManager.js b/services/chat/app/js/Features/Threads/ThreadManager.js
index 414b78b45a..432a1249f2 100644
--- a/services/chat/app/js/Features/Threads/ThreadManager.js
+++ b/services/chat/app/js/Features/Threads/ThreadManager.js
@@ -1,11 +1,8 @@
-let ThreadManager
-const { db, ObjectId } = require('../../mongodb')
-const logger = require('@overleaf/logger')
-const metrics = require('@overleaf/metrics')
+import { db, ObjectId } from '../../mongodb.js'
 
-const GLOBAL_THREAD = 'GLOBAL'
+export const GLOBAL_THREAD = 'GLOBAL'
 
-async function findOrCreateThread(projectId, threadId) {
+export async function findOrCreateThread(projectId, threadId) {
   let query, update
   projectId = ObjectId(projectId.toString())
   if (threadId !== GLOBAL_THREAD) {
@@ -39,7 +36,7 @@ async function findOrCreateThread(projectId, threadId) {
   return result.value
 }
 
-async function findAllThreadRooms(projectId) {
+export async function findAllThreadRooms(projectId) {
   return db.rooms
     .find(
       {
@@ -54,7 +51,7 @@ async function findAllThreadRooms(projectId) {
     .toArray()
 }
 
-async function findAllThreadRoomsAndGlobalThread(projectId) {
+export async function findAllThreadRoomsAndGlobalThread(projectId) {
   return db.rooms
     .find(
       {
@@ -68,7 +65,7 @@ async function findAllThreadRoomsAndGlobalThread(projectId) {
     .toArray()
 }
 
-async function resolveThread(projectId, threadId, userId) {
+export async function resolveThread(projectId, threadId, userId) {
   await db.rooms.updateOne(
     {
       project_id: ObjectId(projectId.toString()),
@@ -85,7 +82,7 @@ async function resolveThread(projectId, threadId, userId) {
   )
 }
 
-async function reopenThread(projectId, threadId) {
+export async function reopenThread(projectId, threadId) {
   await db.rooms.updateOne(
     {
       project_id: ObjectId(projectId.toString()),
@@ -99,7 +96,7 @@ async function reopenThread(projectId, threadId) {
   )
 }
 
-async function deleteThread(projectId, threadId) {
+export async function deleteThread(projectId, threadId) {
   const room = await findOrCreateThread(projectId, threadId)
   await db.rooms.deleteOne({
     _id: room._id,
@@ -107,28 +104,8 @@ async function deleteThread(projectId, threadId) {
   return room._id
 }
 
-async function deleteAllThreadsInProject(projectId) {
+export async function deleteAllThreadsInProject(projectId) {
   await db.rooms.deleteMany({
     project_id: ObjectId(projectId.toString()),
   })
 }
-
-module.exports = ThreadManager = {
-  GLOBAL_THREAD,
-  findOrCreateThread,
-  findAllThreadRooms,
-  findAllThreadRoomsAndGlobalThread,
-  resolveThread,
-  reopenThread,
-  deleteThread,
-  deleteAllThreadsInProject,
-}
-;[
-  'findOrCreateThread',
-  'findAllThreadRooms',
-  'resolveThread',
-  'reopenThread',
-  'deleteThread',
-].map(method =>
-  metrics.timeAsyncMethod(ThreadManager, method, 'mongo.ThreadManager', logger)
-)
diff --git a/services/chat/app/js/mongodb.js b/services/chat/app/js/mongodb.js
index 7ba98f40c2..927ba0e4a2 100644
--- a/services/chat/app/js/mongodb.js
+++ b/services/chat/app/js/mongodb.js
@@ -1,16 +1,12 @@
-const Settings = require('@overleaf/settings')
-const { MongoClient, ObjectId } = require('mongodb')
+import Settings from '@overleaf/settings'
+import { MongoClient } from 'mongodb'
 
-const client = new MongoClient(Settings.mongo.url)
-const db = client.db()
+export { ObjectId } from 'mongodb'
 
-const collections = {
-  messages: db.collection('messages'),
-  rooms: db.collection('rooms'),
-}
-
-module.exports = {
-  db: collections,
-  mongoClient: client,
-  ObjectId,
+export const mongoClient = new MongoClient(Settings.mongo.url)
+const mongoDb = mongoClient.db()
+
+export const db = {
+  messages: mongoDb.collection('messages'),
+  rooms: mongoDb.collection('rooms'),
 }
diff --git a/services/chat/app/js/router.js b/services/chat/app/js/router.js
index 73a1e6c0bd..d7d7a135b6 100644
--- a/services/chat/app/js/router.js
+++ b/services/chat/app/js/router.js
@@ -1,73 +1,65 @@
-const MessageHttpController = require('./Features/Messages/MessageHttpController')
-const { ObjectId } = require('./mongodb')
+import * as MessageHttpController from './Features/Messages/MessageHttpController.js'
+import { ObjectId } from './mongodb.js'
 
-module.exports = {
-  route(app) {
-    app.param('projectId', function (req, res, next, projectId) {
-      if (ObjectId.isValid(projectId)) {
-        next()
-      } else {
-        res.status(400).send('Invalid projectId')
-      }
-    })
+export function route(app) {
+  app.param('projectId', function (req, res, next, projectId) {
+    if (ObjectId.isValid(projectId)) {
+      next()
+    } else {
+      res.status(400).send('Invalid projectId')
+    }
+  })
 
-    app.param('threadId', function (req, res, next, threadId) {
-      if (ObjectId.isValid(threadId)) {
-        next()
-      } else {
-        res.status(400).send('Invalid threadId')
-      }
-    })
+  app.param('threadId', function (req, res, next, threadId) {
+    if (ObjectId.isValid(threadId)) {
+      next()
+    } else {
+      res.status(400).send('Invalid threadId')
+    }
+  })
 
-    // These are for backwards compatibility
-    app.get(
-      '/room/:projectId/messages',
-      MessageHttpController.getGlobalMessages
-    )
-    app.post(
-      '/room/:projectId/messages',
-      MessageHttpController.sendGlobalMessage
-    )
+  // These are for backwards compatibility
+  app.get('/room/:projectId/messages', MessageHttpController.getGlobalMessages)
+  app.post('/room/:projectId/messages', MessageHttpController.sendGlobalMessage)
 
-    app.get(
-      '/project/:projectId/messages',
-      MessageHttpController.getGlobalMessages
-    )
-    app.post(
-      '/project/:projectId/messages',
-      MessageHttpController.sendGlobalMessage
-    )
+  app.get(
+    '/project/:projectId/messages',
+    MessageHttpController.getGlobalMessages
+  )
+  app.post(
+    '/project/:projectId/messages',
+    MessageHttpController.sendGlobalMessage
+  )
 
-    app.post(
-      '/project/:projectId/thread/:threadId/messages',
-      MessageHttpController.sendThreadMessage
-    )
-    app.get('/project/:projectId/threads', MessageHttpController.getAllThreads)
+  app.post(
+    '/project/:projectId/thread/:threadId/messages',
+    MessageHttpController.sendThreadMessage
+  )
+  app.get('/project/:projectId/threads', MessageHttpController.getAllThreads)
 
-    app.post(
-      '/project/:projectId/thread/:threadId/messages/:messageId/edit',
-      MessageHttpController.editMessage
-    )
-    app.delete(
-      '/project/:projectId/thread/:threadId/messages/:messageId',
-      MessageHttpController.deleteMessage
-    )
+  app.post(
+    '/project/:projectId/thread/:threadId/messages/:messageId/edit',
+    MessageHttpController.editMessage
+  )
+  app.delete(
+    '/project/:projectId/thread/:threadId/messages/:messageId',
+    MessageHttpController.deleteMessage
+  )
 
-    app.post(
-      '/project/:projectId/thread/:threadId/resolve',
-      MessageHttpController.resolveThread
-    )
-    app.post(
-      '/project/:projectId/thread/:threadId/reopen',
-      MessageHttpController.reopenThread
-    )
-    app.delete(
-      '/project/:projectId/thread/:threadId',
-      MessageHttpController.deleteThread
-    )
+  app.post(
+    '/project/:projectId/thread/:threadId/resolve',
+    MessageHttpController.resolveThread
+  )
+  app.post(
+    '/project/:projectId/thread/:threadId/reopen',
+    MessageHttpController.reopenThread
+  )
+  app.delete(
+    '/project/:projectId/thread/:threadId',
+    MessageHttpController.deleteThread
+  )
 
-    app.delete('/project/:projectId', MessageHttpController.destroyProject)
+  app.delete('/project/:projectId', MessageHttpController.destroyProject)
 
-    app.get('/status', (req, res, next) => res.send('chat is alive'))
-  },
+  app.get('/status', (req, res, next) => res.send('chat is alive'))
 }
diff --git a/services/chat/app/js/server.js b/services/chat/app/js/server.js
index 49d6d391f9..21ebe2be58 100644
--- a/services/chat/app/js/server.js
+++ b/services/chat/app/js/server.js
@@ -1,12 +1,15 @@
-const metrics = require('@overleaf/metrics')
+import http from 'http'
+import metrics from '@overleaf/metrics'
+import logger from '@overleaf/logger'
+import express from 'express'
+import bodyParser from 'body-parser'
+import * as Router from './router.js'
+
 metrics.initialize('chat')
-const logger = require('@overleaf/logger')
 logger.initialize('chat')
-const express = require('express')
-const bodyParser = require('body-parser')
-const app = express()
-const server = require('http').createServer(app)
-const Router = require('./router')
+
+export const app = express()
+export const server = http.createServer(app)
 
 app.use(bodyParser.json())
 app.use(bodyParser.urlencoded({ extended: true }))
@@ -14,8 +17,3 @@ app.use(metrics.http.monitor(logger))
 metrics.injectMetricsRoute(app)
 
 Router.route(app)
-
-module.exports = {
-  server,
-  app,
-}
diff --git a/services/chat/app/js/util/promises.js b/services/chat/app/js/util/promises.js
index 5a6d88681f..fd46c8cf55 100644
--- a/services/chat/app/js/util/promises.js
+++ b/services/chat/app/js/util/promises.js
@@ -3,10 +3,8 @@
  *
  * Any error will be passed to the error middlewares via `next()`
  */
-function expressify(fn) {
+export function expressify(fn) {
   return (req, res, next) => {
     fn(req, res, next).catch(next)
   }
 }
-
-module.exports = { expressify }
diff --git a/services/chat/config/settings.defaults.js b/services/chat/config/settings.defaults.cjs
similarity index 100%
rename from services/chat/config/settings.defaults.js
rename to services/chat/config/settings.defaults.cjs
diff --git a/services/chat/package.json b/services/chat/package.json
index 5131c328b1..00da2fe1b8 100644
--- a/services/chat/package.json
+++ b/services/chat/package.json
@@ -3,6 +3,7 @@
   "description": "The backend API that powers Overleaf chat",
   "private": true,
   "main": "app.js",
+  "type": "module",
   "scripts": {
     "start": "node $NODE_APP_OPTIONS app.js",
     "test:acceptance": "npm run test:acceptance:_run -- --grep=$MOCHA_GREP",
diff --git a/services/chat/test/acceptance/js/DeletingAMessageTests.js b/services/chat/test/acceptance/js/DeletingAMessageTests.js
index 1e6b3db5eb..dfe2ee0bd8 100644
--- a/services/chat/test/acceptance/js/DeletingAMessageTests.js
+++ b/services/chat/test/acceptance/js/DeletingAMessageTests.js
@@ -1,8 +1,8 @@
-const { ObjectId } = require('../../../app/js/mongodb')
-const { expect } = require('chai')
+import { ObjectId } from '../../../app/js/mongodb.js'
+import { expect } from 'chai'
 
-const ChatClient = require('./helpers/ChatClient')
-const ChatApp = require('./helpers/ChatApp')
+import * as ChatClient from './helpers/ChatClient.js'
+import * as ChatApp from './helpers/ChatApp.js'
 
 describe('Deleting a message', async function () {
   const projectId = ObjectId().toString()
diff --git a/services/chat/test/acceptance/js/DeletingAThreadTests.js b/services/chat/test/acceptance/js/DeletingAThreadTests.js
index 74533c6f44..aa3c6a609a 100644
--- a/services/chat/test/acceptance/js/DeletingAThreadTests.js
+++ b/services/chat/test/acceptance/js/DeletingAThreadTests.js
@@ -1,8 +1,8 @@
-const { ObjectId } = require('../../../app/js/mongodb')
-const { expect } = require('chai')
+import { ObjectId } from '../../../app/js/mongodb.js'
+import { expect } from 'chai'
 
-const ChatClient = require('./helpers/ChatClient')
-const ChatApp = require('./helpers/ChatApp')
+import * as ChatClient from './helpers/ChatClient.js'
+import * as ChatApp from './helpers/ChatApp.js'
 
 describe('Deleting a thread', async function () {
   const projectId = ObjectId().toString()
diff --git a/services/chat/test/acceptance/js/DestroyingAProjectTests.js b/services/chat/test/acceptance/js/DestroyingAProjectTests.js
index e4a45dbf00..2330db6149 100644
--- a/services/chat/test/acceptance/js/DestroyingAProjectTests.js
+++ b/services/chat/test/acceptance/js/DestroyingAProjectTests.js
@@ -1,8 +1,8 @@
-const { ObjectId } = require('../../../app/js/mongodb')
-const { expect } = require('chai')
+import { ObjectId } from '../../../app/js/mongodb.js'
+import { expect } from 'chai'
 
-const ChatClient = require('./helpers/ChatClient')
-const ChatApp = require('./helpers/ChatApp')
+import * as ChatClient from './helpers/ChatClient.js'
+import * as ChatApp from './helpers/ChatApp.js'
 
 const db = ChatApp.db
 
diff --git a/services/chat/test/acceptance/js/EditingAMessageTests.js b/services/chat/test/acceptance/js/EditingAMessageTests.js
index f39a919c51..c806b4cc1b 100644
--- a/services/chat/test/acceptance/js/EditingAMessageTests.js
+++ b/services/chat/test/acceptance/js/EditingAMessageTests.js
@@ -1,8 +1,8 @@
-const { ObjectId } = require('../../../app/js/mongodb')
-const { expect } = require('chai')
+import { ObjectId } from '../../../app/js/mongodb.js'
+import { expect } from 'chai'
 
-const ChatClient = require('./helpers/ChatClient')
-const ChatApp = require('./helpers/ChatApp')
+import * as ChatClient from './helpers/ChatClient.js'
+import * as ChatApp from './helpers/ChatApp.js'
 
 describe('Editing a message', async function () {
   let projectId, userId, threadId
diff --git a/services/chat/test/acceptance/js/GettingMessagesTests.js b/services/chat/test/acceptance/js/GettingMessagesTests.js
index fb400ecea6..83f0c8c137 100644
--- a/services/chat/test/acceptance/js/GettingMessagesTests.js
+++ b/services/chat/test/acceptance/js/GettingMessagesTests.js
@@ -1,8 +1,8 @@
-const { ObjectId } = require('../../../app/js/mongodb')
-const { expect } = require('chai')
+import { ObjectId } from '../../../app/js/mongodb.js'
+import { expect } from 'chai'
 
-const ChatClient = require('./helpers/ChatClient')
-const ChatApp = require('./helpers/ChatApp')
+import * as ChatClient from './helpers/ChatClient.js'
+import * as ChatApp from './helpers/ChatApp.js'
 
 describe('Getting messages', async function () {
   const userId1 = ObjectId().toString()
diff --git a/services/chat/test/acceptance/js/ResolvingAThreadTests.js b/services/chat/test/acceptance/js/ResolvingAThreadTests.js
index d14c004943..afec51f375 100644
--- a/services/chat/test/acceptance/js/ResolvingAThreadTests.js
+++ b/services/chat/test/acceptance/js/ResolvingAThreadTests.js
@@ -1,8 +1,8 @@
-const { ObjectId } = require('../../../app/js/mongodb')
-const { expect } = require('chai')
+import { ObjectId } from '../../../app/js/mongodb.js'
+import { expect } from 'chai'
 
-const ChatClient = require('./helpers/ChatClient')
-const ChatApp = require('./helpers/ChatApp')
+import * as ChatClient from './helpers/ChatClient.js'
+import * as ChatApp from './helpers/ChatApp.js'
 
 describe('Resolving a thread', async function () {
   const projectId = ObjectId().toString()
diff --git a/services/chat/test/acceptance/js/SendingAMessageTests.js b/services/chat/test/acceptance/js/SendingAMessageTests.js
index 9f3b87a26c..900ac32e64 100644
--- a/services/chat/test/acceptance/js/SendingAMessageTests.js
+++ b/services/chat/test/acceptance/js/SendingAMessageTests.js
@@ -1,8 +1,8 @@
-const { ObjectId } = require('../../../app/js/mongodb')
-const { expect } = require('chai')
+import { ObjectId } from '../../../app/js/mongodb.js'
+import { expect } from 'chai'
 
-const ChatClient = require('./helpers/ChatClient')
-const ChatApp = require('./helpers/ChatApp')
+import * as ChatClient from './helpers/ChatClient.js'
+import * as ChatApp from './helpers/ChatApp.js'
 
 describe('Sending a message', async function () {
   before(async function () {
diff --git a/services/chat/test/acceptance/js/helpers/ChatApp.js b/services/chat/test/acceptance/js/helpers/ChatApp.js
index 163dc0db02..9286842e2e 100644
--- a/services/chat/test/acceptance/js/helpers/ChatApp.js
+++ b/services/chat/test/acceptance/js/helpers/ChatApp.js
@@ -1,9 +1,10 @@
-const { db } = require('../../../../app/js/mongodb')
-const app = require('../../../../app')
+import { server } from '../../../../app/js/server.js'
+
+export { db } from '../../../../app/js/mongodb.js'
 
 let serverPromise = null
 function startServer(resolve, reject) {
-  app.listen(3010, 'localhost', error => {
+  server.listen(3010, 'localhost', error => {
     if (error) {
       return reject(error)
     }
@@ -11,14 +12,9 @@ function startServer(resolve, reject) {
   })
 }
 
-async function ensureRunning() {
+export async function ensureRunning() {
   if (!serverPromise) {
     serverPromise = new Promise(startServer)
   }
   return serverPromise
 }
-
-module.exports = {
-  db,
-  ensureRunning,
-}
diff --git a/services/chat/test/acceptance/js/helpers/ChatClient.js b/services/chat/test/acceptance/js/helpers/ChatClient.js
index e79cef3209..4827099cd5 100644
--- a/services/chat/test/acceptance/js/helpers/ChatClient.js
+++ b/services/chat/test/acceptance/js/helpers/ChatClient.js
@@ -1,4 +1,6 @@
-const request = require('request').defaults({
+import Request from 'request'
+
+const request = Request.defaults({
   baseUrl: 'http://localhost:3010',
 })
 
@@ -14,7 +16,7 @@ async function asyncRequest(options) {
   })
 }
 
-async function sendGlobalMessage(projectId, userId, content) {
+export async function sendGlobalMessage(projectId, userId, content) {
   return asyncRequest({
     method: 'post',
     url: `/project/${projectId}/messages`,
@@ -25,7 +27,7 @@ async function sendGlobalMessage(projectId, userId, content) {
   })
 }
 
-async function getGlobalMessages(projectId) {
+export async function getGlobalMessages(projectId) {
   return asyncRequest({
     method: 'get',
     url: `/project/${projectId}/messages`,
@@ -33,7 +35,7 @@ async function getGlobalMessages(projectId) {
   })
 }
 
-async function sendMessage(projectId, threadId, userId, content) {
+export async function sendMessage(projectId, threadId, userId, content) {
   return asyncRequest({
     method: 'post',
     url: `/project/${projectId}/thread/${threadId}/messages`,
@@ -44,7 +46,7 @@ async function sendMessage(projectId, threadId, userId, content) {
   })
 }
 
-async function getThreads(projectId) {
+export async function getThreads(projectId) {
   return asyncRequest({
     method: 'get',
     url: `/project/${projectId}/threads`,
@@ -52,7 +54,7 @@ async function getThreads(projectId) {
   })
 }
 
-async function resolveThread(projectId, threadId, userId) {
+export async function resolveThread(projectId, threadId, userId) {
   return asyncRequest({
     method: 'post',
     url: `/project/${projectId}/thread/${threadId}/resolve`,
@@ -62,21 +64,21 @@ async function resolveThread(projectId, threadId, userId) {
   })
 }
 
-async function reopenThread(projectId, threadId) {
+export async function reopenThread(projectId, threadId) {
   return asyncRequest({
     method: 'post',
     url: `/project/${projectId}/thread/${threadId}/reopen`,
   })
 }
 
-async function deleteThread(projectId, threadId) {
+export async function deleteThread(projectId, threadId) {
   return asyncRequest({
     method: 'delete',
     url: `/project/${projectId}/thread/${threadId}`,
   })
 }
 
-async function editMessage(projectId, threadId, messageId, content) {
+export async function editMessage(projectId, threadId, messageId, content) {
   return asyncRequest({
     method: 'post',
     url: `/project/${projectId}/thread/${threadId}/messages/${messageId}/edit`,
@@ -86,7 +88,7 @@ async function editMessage(projectId, threadId, messageId, content) {
   })
 }
 
-async function editMessageWithUser(
+export async function editMessageWithUser(
   projectId,
   threadId,
   messageId,
@@ -103,30 +105,16 @@ async function editMessageWithUser(
   })
 }
 
-async function deleteMessage(projectId, threadId, messageId) {
+export async function deleteMessage(projectId, threadId, messageId) {
   return asyncRequest({
     method: 'delete',
     url: `/project/${projectId}/thread/${threadId}/messages/${messageId}`,
   })
 }
 
-async function destroyProject(projectId) {
+export async function destroyProject(projectId) {
   return asyncRequest({
     method: 'delete',
     url: `/project/${projectId}`,
   })
 }
-
-module.exports = {
-  sendGlobalMessage,
-  getGlobalMessages,
-  sendMessage,
-  getThreads,
-  resolveThread,
-  reopenThread,
-  deleteThread,
-  editMessage,
-  editMessageWithUser,
-  deleteMessage,
-  destroyProject,
-}