Basic websocket example in JavaScript

Here's a little snippet to play with WebSocket.
It's called an echo server, meaning, whatever you send to it
it will send that exact thing back to you.

If you run below snippet (or paste it in the console of your browser),
you will see a log like:
server sent you a message: hello

var ws = new WebSocket('wss://echo.websocket.org');

ws.onopen = function (e) {
  console.log('connected to server');
};
ws.onmessage = function (e) {
  console.log('server sent you a message:', e.data);
};
ws.onerror = function (e) {
  console.log('connection encountered an error');
};
ws.onclose = function (e) {
  console.log('connection closed', e.code, e.reason, e.wasClean);
};

ws.send('hello');

Now for example send another thing to server like

ws.send('hi');

and you will see another log like
server sent you a message: hi