server (client + server) websocket node.js

gistfile1.js

// (server) server-side

var io = require('socket.io').listen(8000);

io.sockets.on('connection', function (socket) {
  socket.emit('news', { hello: 'world' });
  socket.on('ping', function (data) {
    console.log(data);
  });


});

// (server) client-side

var protocol    = 'ws';
var domain  = 'localhost';
var port    = 8000;
var options = {
    'max reconnection attempts' : 10,
    'reconnection delay'        : 2000,
    'transports'            : [
        'websocket'
    ]
}

var SocketIOClient = require('socket.io-client');

var IOClient = SocketIOClient.connect(protocol + '://' + domain + ':' + port, options);

IOClient.on('connect', function(){
    console.log("Connected", arguments);
    IOClient.emit('ping', 'pong');
});