node.js express -如何将POST主体参数传递回原始表单以在无效时重新填充？

const express = require('express');
const bodyParser = require('body-parser');
const app = express();

app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());

app.post('/form', (req, res) => {
  // 处理POST请求的逻辑
  // ...

  // 将参数传递回原始表单
  res.render('form', { data: req.body });
});

<form action="/form" method="POST">
  <input type="text" name="username" value="{{ data.username }}" />
  <input type="email" name="email" value="{{ data.email }}" />
  <!-- 其他表单字段 -->
  <button type="submit">提交</button>
</form>