Socket.io 1.0.x Authentication example

client.js

'use strict';

var socket = io.connect('http://localhost:3000', { query: 'token=12345'});

server.js

'use strict';

/*
* Module dependencies
*/

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

//Auth middleware

io.use(function(socket, next) {
    if (socket.handshake.query.token === '12344') {
        return next();
    } else {
        return next(new Error('Access Denied!'));
    }
});