Node.jsでPOSTされたデータをパースする

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

const server = http.createServer((req, res) => {
  const url = req.url;
  const method = req.method;
  if (url === '/message' && method === 'POST') {
    const body = [];
    req.on('data', function (chunk) {
      body.push(chunk);
    });
    req.on('end', () => {
      const parseBody = Buffer.concat(body).toString();
      const message = parseBody.split('=')[1];
      fs.writeFileSync('message.txt', message);
    });
    res.statusCode = 302;
    res.setHeader('Location', '/');
    return res.end();
  }
});

server.listen(3000);