有没有办法将数据从我的client.js传递到我的server.js，因为它会根据访问我网站的客户返回多个数据

fetch('/submit-data', {
    method: 'POST',
    headers: {
        'Content-Type': 'application/json'
    },
    body: JSON.stringify({ key1: 'value1', key2: 'value2' })
})
.then(response => response.json())
.then(data => console.log('Success:', data))
.catch((error) => console.error('Error:', error));

const express = require('express');
const app = express();
app.use(express.json());

app.post('/submit-data', (req, res) => {
    console.log(req.body); // { key1: 'value1', key2: 'value2' }
    res.json({ message: 'Data received' });
});

app.listen(3000, () => {
    console.log('Server is running on port 3000');
});

const socket = new WebSocket('ws://example.com/socket');

socket.onopen = () => {
    socket.send(JSON.stringify({ message: 'Hello Server!' }));
};

socket.onmessage = (event) => {
    console.log('Message from server:', event.data);
};

const WebSocket = require('ws');
const wss = new WebSocket.Server({ port: 8080 });

wss.on('connection', (ws) => {
    ws.on('message', (message) => {
        console.log('Received:', message);
        ws.send(JSON.stringify({ response: 'Hello Client!' }));
    });
});