index.html

<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="https://cdn.socket.io/4.3.2/socket.io.min.js" integrity="sha384-KAZ4DtjNhLChOB/hxXuKqhMLYvx3b5MlT55xPEiNmREKRzeEm+RVPlTnAn0ajQNs" crossorigin="anonymous"></script>
  <script src="https://cdn.jsdelivr.net/npm/vue@2.7.8/dist/vue.js"></script>
</head>
<body>
  <div id="v-app">
    <h1>{{ title }}</h1>
    <form>
      <input v-model="text" type="text">
      <button type="submit" @click.prevent="sendMessage()">Send</button>
    </form>
    <p>
      <ul>
        <li v-for="msg of messages">{{ msg }}</li>
      </ul>
    </p>
  </div>
  <script>
    var app = new Vue({
      el: '#v-app',
      data: {
        title: 'Socket IO',
        text: '',
        messages: ['Some message', 'Another message'],
        socket: null
      },
      methods: {
        sendMessage() {
          console.log(`Send : ${this.text}`);
          this.socket.emit('msgToServer', this.text);
          this.text = "";
        },

        receiveMessage(msg){
          console.log(`Receive : ${msg}`);
          this.messages.push(msg);
        },
      },
      created(){
        this.socket = io('http://localhost:3000/');
        this.socket.on('msgToClient', (msg) => {
          this.receiveMessage(msg);
        });
        this.socket.on('eventCheckedChecklist', (data) => {
          console.log(data);
        });
        this.socket.on('eventLabelFinished', (data) => {
          console.log('eventLabelFinished : ' + data);
        })
        this.socket.on('eventChecklistRefaire', (data) => {
          console.log(data);
        })
        this.socket.on('eventRetardLabel', (data) => {
          console.log("EN RETARD :");
          console.log(data);
        })
        this.socket.on('eventTest', (data) => {
          console.log("Websocket event : eventTest");
          console.log(data);
        })
        this.socket.on('mybroadcast', (data) => {
          console.log('EVENT : mybroadcast');
          console.log(data);
        })
      }
    })
  </script>
</body>
</html>