How to close/terminate the socket connection?

[andyprasetya]

Hello, I tried to implement setInterval in the block ws.onmessage with the following code:

ws.on('message', function incoming(message) {
	console.log('received: %s', message);
	setInterval(function(){
		ws.send('message from server at: ' + new Date());
	},10*1000);
	connectedUsers.push(message);
});

And this was triggered by the client's code:

function socket_data () {
	wsocket = new WebSocket('ws://localhost:3000/socketdata');
	wsocket.onopen = function () {
		console.log('client is trying to open websocket for realtime data...');
		wsocket.send('request_data');
	}
	wsocket.onmessage = function (evt) {
		console.log(evt.data);
	}
}

Now, how to implement close/terminate the socket connection?