nodeChatServer.js

var express = require('express');
var app = express();
var server = require('http').createServer(app);
var io = require('socket.io')(server);

app.use(express.static(__dirname + '/public'));

app.get("/", function (req, res) {
    res.sendFile(__dirname + '/public/chat.html');
});

io.on('connection', function (client) {
    client.broadcast.emit('messageGeneral','Nouvelle connexion !');
    client.on('nouveauPost', function (message) {
        client.emit('messageGeneral', message);
        client.broadcast.emit('messageGeneral', message);
    });
});

server.listen(8080);