server.js

var http = require('http');

var socketio = require('socket.io');
var ecstatic = require('ecstatic');

var players = {};

var fileServer = ecstatic({root: __dirname + '/public'});
var httpServer = http.createServer(fileServer);

var io = socketio.listen(httpServer);
httpServer.listen(8080);

io.sockets.on('connection', function(socket) {
	players[socket.id] = {};

	socket.emit('players', players);

	socket.emit('player', socket.id);

	socket.on('update', function(player) {
		players[player.id] = player;
		io.sockets.emit('updatePlayers', players);
	});

	socket.on('disconnect', function() {
		delete players[socket.id];
	});
});