如何在node.js中创建附加到实际响应的json对象

const http = require('http');
const fs = require('fs');

http.createServer((req, res) => {
  // 在这里处理请求
}).listen(3000); // 监听3000端口

http.createServer((req, res) => {
  res.writeHead(200, { 'Content-Type': 'application/json' });
  // 在这里处理请求
}).listen(3000);

http.createServer((req, res) => {
  res.writeHead(200, { 'Content-Type': 'application/json' });

  const data = {
    message: 'Hello, World!',
    timestamp: new Date().toISOString()
  };

  // 在这里处理请求
}).listen(3000);

http.createServer((req, res) => {
  res.writeHead(200, { 'Content-Type': 'application/json' });

  const data = {
    message: 'Hello, World!',
    timestamp: new Date().toISOString()
  };

  res.end(JSON.stringify(data));
}).listen(3000);