如何使用node js向我的JSON响应添加新元素

const fs = require('fs');
const path = require('path');
const express = require('express');
const app = express();

app.get('/add-element', (req, res) => {
  // 读取JSON文件
  const filePath = path.join(__dirname, 'data.json');
  const jsonData = fs.readFileSync(filePath, 'utf-8');
  const data = JSON.parse(jsonData);

  // 添加新元素
  data.newElement = 'Hello, World!';

  // 将更新后的JSON数据写入文件
  fs.writeFileSync(filePath, JSON.stringify(data));

  // 发送响应
  res.send('New element added to JSON response.');
});

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

{
  "name": "John Doe",
  "age": 30
}

{
  "name": "John Doe",
  "age": 30,
  "newElement": "Hello, World!"
}