chatServer.js

var app = require('http').createServer(handler) 
        , io = require('socket.io').listen(app)
        , fs = require('fs');
app.listen(8124);

function handler (req, res) { 
        fs.readFile(__dirname + '/chat.html', function (err, data) {
                if (err) { res.writeHead(500);
                return res.end('Error loading chat.html'); }
        res.writeHead(200);
        res.end(data); });
}
io.sockets.on('connection', function (socket) {
        socket.on('addme',function(username) {                
                socket.username = username;
                socket.emit('chat', 'SERVER', 'Hi '+ username+' You have connected'); 
                socket.broadcast.emit('chat', 'SERVER', username + ' is on deck');
        });
        socket.on('sendchat', function(data) { 
                io.sockets.emit('chat', socket.username, data);
        });

        socket.on('disconnect', function() {
                io.sockets.emit('chat', 'SERVER', socket.username + ' has left the building');
        });
});