如何在Express.js中将JS字符串以xml文档的形式发送给用户？

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

app.get('/', (req, res) => {
  const xmlString = '<root><name>John</name><age>25</age></root>';
  
  res.set('Content-Type', 'application/xml');
  res.send(xmlString);
});

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