Working example of WebSocket server on NODE.js ['ws']

webSocketServer.js

//dependency: https://github.com/websockets/ws
//dependency installation: npm install --save ws
var WebSocketServer = require('ws').Server,
    wss = new WebSocketServer({
        port: 8080
    });

// Broadcast to all.
wss.broadcast = function broadcast(data) {
    wss.clients.forEach(function each(client) {
        client.send(data);
    });
};

wss.on('connection', function connection(ws) {
            ws.on('message', function incoming(message) {
                    console.log('received: %s', message);
                    wss.clients.forEach(function each(client) {
                        //you Know about your message from server
                        // if (client !== ws)
                        client.send(message); 
                    });
                });

                ws.send('Welcome on our WebSocketServer!)');
            });