在GET请求中从Node.js中读取JSON值

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

const server = http.createServer((req, res) => {
  if (req.url === '/data' && req.method === 'GET') {
    // 读取JSON文件
    fs.readFile('data.json', 'utf8', (err, data) => {
      if (err) {
        res.statusCode = 500;
        res.end('Internal Server Error');
        return;
      }

      try {
        // 解析JSON字符串为对象
        const jsonData = JSON.parse(data);
        // 从对象中获取值
        const value = jsonData.key;

        res.statusCode = 200;
        res.setHeader('Content-Type', 'application/json');
        res.end(JSON.stringify({ value }));
      } catch (error) {
        res.statusCode = 500;
        res.end('Internal Server Error');
      }
    });
  } else {
    res.statusCode = 404;
    res.end('Not Found');
  }
});

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