Untitled

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<html>
<head>
  <title></title>
</head>
<body>
<pre id="chatter"></pre>
<script type="text/javascript" charset="utf-8">
  const ws = new WebSocket('ws://localhost:3000')

  ws.onmessage = ({ data }) => {
    chatter.innerHTML += '\nreceived: ' + data
    setTimeout(() => {
      chatter.innerHTML +=  '\nsending : got it'
      ws.send('got it')
    }, 1000)
  }
</script>
</body>
</html>