后端JS怎么返回JSON数据_Node后端返回JSON格式数据方法与实例

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

app.get('/api/user', (req, res) => {
  const user = {
    id: 1,
    name: '张三',
    age: 25
  };
  res.json(user); // 自动返回JSON并设置头信息
});

app.listen(3000, () => {
  console.log('服务启动在 http://localhost:3000');
});

const http = require('http');

const server = http.createServer((req, res) => {
  if (req.url === '/api/data' && req.method === 'GET') {
    const data = { message: 'Hello JSON!', success: true };

    res.writeHead(200, {
      'Content-Type': 'application/json; charset=utf-8'
    });

    res.end(JSON.stringify(data));
  } else {
    res.writeHead(404, { 'Content-Type': 'application/json' });
    res.end(JSON.stringify({ error: '接口不存在' }));
  }
});

server.listen(3000, () => {
  console.log('原生服务运行在 http://localhost:3000');
});

res.writeHead(200, {
  'Content-Type': 'application/json; charset=utf-8'
});

res.json({
  code: 200,
  message: '请求成功',
  data: userData
});

res.status(500).json({
  code: 500,
  message: '服务器内部错误',
  data: null
});