diff --git a/backend/service-message/auth.js b/backend/service-message/auth.js
new file mode 100644
index 0000000..d198a41
--- /dev/null
+++ b/backend/service-message/auth.js
@@ -0,0 +1,26 @@
+const sessionJwt = require ('./sessionJWT');
+
+// ici, on récupère le contenu du cookie de session JWT.
+// celui-ci contient le userId mais également des informations
+// concernant sa date d'expiration.
+function getSession (req) {
+    return sessionJwt.decodeSessionCookie(req);
+}
+module.exports.getSession = getSession;
+
+// cette fonction ajoute le cookie de session au headers du
+// message qui sera renvoyé à Angular. Si le cookie actuel
+// est "vieux", on en recrée ici un nouveau.
+function setSessionCookie (req, res, session) {
+    sessionJwt.createSessionCookie(req, res, session);
+}
+module.exports.setSessionCookie = setSessionCookie;
+
+// fonction pour récupérer le userId provenant du cookie
+// de session. Si ce dernier n'existe pas, on renvoie
+// l'ID -1.
+function getUsername(session) {
+    if (typeof session.username === 'undefined') return -1;
+    return session.username;
+}
+module.exports.getUsername = getUsername;
diff --git a/backend/service-message/config.js b/backend/service-message/config.js
new file mode 100644
index 0000000..fb37e42
--- /dev/null
+++ b/backend/service-message/config.js
@@ -0,0 +1,13 @@
+const config = {
+    mongodbDatabase: 'chat',
+    mongodbHost:     'mongodb://localhost:27020/',
+    charset:       'utf8',
+    mongodbLogin:  '',
+    mongodbPassword: '',
+
+    mongodbMessages: 'messages'
+};
+module.exports = config;
+
+
+
diff --git a/backend/service-message/message.js b/backend/service-message/message.js
new file mode 100644
index 0000000..05714bc
--- /dev/null
+++ b/backend/service-message/message.js
@@ -0,0 +1,13 @@
+// renvoie un message au format JSON. On a besoin de passer en paramètre
+// res, la réponse que l'on envoie au client (Angular). Le paramètre
+// data est un objet JavaScript. Globalement, cette fonction est
+// équivalente au "echo json_encode(data);" que vous utilisiez en PHP
+function sendMessage (res, data) {
+    res.json ({ status: 'ok', data: data });
+}
+
+function sendError (res, reason) {
+    res.json ({ status: 'error', data: {reason: reason }});
+}
+
+module.exports = { sendMessage, sendError };
diff --git a/backend/service-message/mongodb-message.js b/backend/service-message/mongodb-message.js
new file mode 100644
index 0000000..df441f8
--- /dev/null
+++ b/backend/service-message/mongodb-message.js
@@ -0,0 +1,34 @@
+const config = require('./config');
+const mongoose = require( 'mongoose' );
+const url = config.mongodbHost;
+
+mongoose.connect(url,({useNewUrlParser: true, useUnifiedTopology: true}));
+console.log(mongoose.connection.readyState);
+
+const schemaMessage = mongoose.Schema({
+    username:{
+        type: String,
+        required: true
+    },
+    date:{
+        type: Date,
+        required: true
+    },
+    channel:{
+        type: String,
+        required: true
+    },
+    message:{
+        type: String,
+        required: true
+    }
+});
+
+const messages = mongoose.model(config.mongodbMessages, schemaMessage);
+
+// messages.find({},(err, messages) => {
+//     if(err) throw  err;
+//     console.log(messages);
+// });
+
+module.exports = messages;
diff --git a/backend/service-message/package-lock.json b/backend/service-message/package-lock.json
new file mode 100644
index 0000000..bf9c4b6
--- /dev/null
+++ b/backend/service-message/package-lock.json
@@ -0,0 +1,849 @@
+{
+  "name": "service-message",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
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+    "@types/cookie": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/@types/cookie/-/cookie-0.4.0.tgz",
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+    "@types/mongodb": {
+      "version": "3.6.16",
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diff --git a/backend/service-message/package.json b/backend/service-message/package.json
new file mode 100644
index 0000000..051c9ee
--- /dev/null
+++ b/backend/service-message/package.json
@@ -0,0 +1,22 @@
+{
+  "name": "service-message",
+  "version": "1.0.0",
+  "description": "",
+  "main": "server.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "body-parser": "^1.19.0",
+    "cookie-parser": "^1.4.5",
+    "cors": "^2.8.5",
+    "express": "^4.17.1",
+    "fs": "0.0.1-security",
+    "jsonwebtoken": "^8.5.1",
+    "mongoose": "^5.12.11",
+    "socket.io": "^4.1.2"
+  }
+}
diff --git a/backend/service-message/server.js b/backend/service-message/server.js
new file mode 100644
index 0000000..c6cf276
--- /dev/null
+++ b/backend/service-message/server.js
@@ -0,0 +1,81 @@
+const express = require('express');
+const http = require('http');
+const { Server } = require("socket.io");
+const cors = require ('cors');
+const cookieParser = require('cookie-parser');
+const auth = require ('./auth');
+const bodyParser = require ('body-parser');
+const {sendError, sendMessage} = require ('./message');
+const messages = require('./mongodb-message');
+
+const app = express();
+const server = http.createServer(app);
+const io = new Server(server);
+const port = process.env.PORT || 3000;
+
+app.use(bodyParser.json());
+app.use(cors({origin: 'http://127.0.0.1:4200', credentials: true}));
+app.use(cookieParser());
+
+
+app.get('/', (req, res) => {
+    const session = auth.getSession(req);
+    const getUsername = auth.getUsername(session);
+    if (getUsername === -1) {
+        //sendError(res, 'not authenticated');
+    }
+    //auth.setSessionCookie(req, res, session);
+    res.sendFile(__dirname + '/index.html');
+
+});
+
+io.on('connection',socket => {
+    let users = {}
+
+    socket.on('user', (userData) => {
+        console.log(`${getUsername} joined the chat.`);
+        users[socket.id] = getUsername;
+        messages.find({},(err, res) => {
+            if(err) throw err;
+            if(res.length > 0){
+                const savedChat = res;
+                socket.emit('general',savedChat);
+            }
+        });
+    });
+
+    socket.on('general',function(data){
+        socket.broadcast.emit('general',data);
+
+        const username = data.username;
+        const date = Date.now();
+        const channel = 'general';
+        const message = data.message;
+
+        messages.insertMany([{
+                username: username,
+                date: date,
+                channel: channel,
+                message: message
+            }
+        ]).then(function(){
+            console.log(data, "inserted");
+        }).catch(function(error){
+            console.log("error",error);
+        });
+
+    });
+
+    socket.on('typing',(user)=>{
+        socket.broadcast.emit('notifyTyping',user)
+    })
+
+    socket.on("disconnect", function() {
+        console.log(`${socket.id} left the chat.`);
+    });
+
+});
+
+server.listen(port, () => {
+    console.log('listening on *:3000');
+});
\ No newline at end of file
diff --git a/backend/service-message/sessionJWT.js b/backend/service-message/sessionJWT.js
new file mode 100644
index 0000000..7372845
--- /dev/null
+++ b/backend/service-message/sessionJWT.js
@@ -0,0 +1,87 @@
+const sessionJWT = require ('jsonwebtoken');
+const fs = require ('fs');
+
+// renvoie un nouveau token JWT
+function createSessionJWT (userId) {
+    // ci-dessous, on met en place le cookie de session JWT :
+    // 1/ on recupere notre clef privee
+    const RSA_PRIVATE_KEY = fs.readFileSync('./keys/jwtRS256.key');
+
+    // 2/ on signe un token JWT. Le payload est l'identifiant de
+    // l'utilisateur ainsi qu'une date d'expiration à mi-parcours :
+    // on récupérra ultérieurement ces informations, qui permettront
+    // de savoir si le token est valide ou non et de connaître l'ID
+    // de l'utilisateur. Dans le token, le champ exp indique la date
+    // de validité du token (pas besoin de se relogguer tant que la
+    // date actuelle est inférieure à exp) et le champ midExp indique
+    // à partir de quel moment on doit recréer un nouveau cookie de
+    // session.
+    const jwtToken = sessionJWT.sign(
+        {
+            userId: userId,
+            midExp: Math.floor(Date.now() / 1000) + 1800 // validité: 30mn
+        },
+        RSA_PRIVATE_KEY,
+        {
+            algorithm: 'RS256',
+            expiresIn: '1h' // champ exp: validité 1h
+    });
+
+    return jwtToken;
+}
+
+
+// crée un cookie de session JWT (Si le JWT de la requête est encore valide,
+// on l'utilise, sinon on en recrée un nouveau)
+function createSessionCookie(req, res, payload) {
+    // on regarde si le payload contient les champs userId et midExp. Si c'est le
+    // cas, c'est qu'on a reçu dans la request un cookie. On va donc vérifier si
+    // ce cookie est encore valide ou non : si la date actuelle est inférieure à
+    // midExp, alors le cookie est encore valide et on peut le renvoyer. Sinon,
+    // on doit recalculer un nouveau cookie.
+    let jwtToken = '';
+    if ((typeof payload.userId !== 'undefined') && 
+        (typeof payload.midExp !== 'undefined') &&
+        (Math.floor(Date.now() / 1000) <= payload.midExp)) {
+        jwtToken = req.cookies.SESSIONID;
+    }
+    else {
+        // on crée un nouveau cookie
+        jwtToken = createSessionJWT(payload.userId);
+    }
+
+    // on renvoie le cookie au client
+    // on met le secure à false afin de pouvoir utiliser http plutôt que https
+    res.cookie('SESSIONID', jwtToken, {httpOnly:true, secure:false});
+}
+module.exports.createSessionCookie = createSessionCookie;
+
+
+// décode un cookie de session et renvoie les informations contenues dans ce
+// cookie, notamment le userId. Si le cookie n'existe pas, la fonction renvoie
+// juste un objet avec un userId égal à -1.
+function decodeSessionCookie(req) {
+    // si l'on n'a pas de cookie de session, on renvoie une session avec vide,
+    // avec juste un userId à -1
+    if (typeof req.cookies.SESSIONID === 'undefined') {
+        return { userId: -1 };
+    }
+    const sessionid = req.cookies.SESSIONID;
+
+    // on lit la clef publique
+    const RSA_PUBLIC_KEY = fs.readFileSync('./keys/jwtRS256.key.pub');
+
+    // on récupère les données du cookie
+    try {
+        const token = sessionJWT.verify(
+            sessionid,
+            RSA_PUBLIC_KEY,
+            {algorithms: ['RS256']});
+        return token;
+    }
+    catch (err) {
+        return {userId: -1};
+    }
+}
+module.exports.decodeSessionCookie = decodeSessionCookie;
+