Vueを使ってオンラインチャット機能を実装するにはどうすればよいですか?

vue create chat-app

cd chat-app
npm run serve

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/css/materialize.min.css">

<div class="container">
  <div class="row">
    <div class="col s12">
      <ul class="collection">
        <li class="collection-item avatar">
          <i class="material-icons circle blue">person</i>
          <p class="title">John Doe</p>
          <p class="message">Hello</p>
        </li>
        <li class="collection-item avatar">
          <i class="material-icons circle green">person</i>
          <p class="title">Jane Doe</p>
          <p class="message">Hi</p>
        </li>
      </ul>
    </div>
  </div>
  <div class="row">
    <div class="input-field col s12">
      <input type="text" id="message">
      <label for="message">Message</label>
    </div>
  </div>
</div>

npm install socket.io-client

import io from 'socket.io-client';

export default {
  name: 'App',
  data() {
    return {
      username: 'User',
      messages: [],
      message: '',
      socket: null,
    };
  },
  mounted() {
    this.socket = io('http://localhost:3000');

    this.socket.on('connect', () => {
      console.log('Connected to server');
    });

    this.socket.on('disconnect', () => {
      console.log('Disconnected from server');
    });

    this.socket.on('message', (data) => {
      this.messages.push(data);
    });
  },
  methods: {
    sendMessage() {
      if (this.message.trim() !== '') {
        const data = {
          username: this.username,
          message: this.message.trim(),
        };
        this.socket.emit('message', data);
        this.messages.push(data);
        this.message = '';
      }
    },
  },
};

<input type="text" id="message" v-model="message" @keyup.enter="sendMessage">

npm install express socket.io

const express = require('express');
const app = express();
const server = require('http').Server(app);
const io = require('socket.io')(server);

const PORT = process.env.PORT || 3000;

let messages = [];

app.use(express.static('public'));

io.on('connection', (socket) => {
  console.log('User connected');

  socket.on('message', (data) => {
    messages.push(data);
    socket.broadcast.emit('message', data);
  });

  socket.on('disconnect', () => {
    console.log('User disconnected');
  });

  socket.emit('messages', messages);
});

server.listen(PORT, () => {
  console.log(`Server running on port ${PORT}`);
});

npm run serve

node server.js