单个输入上的多个字段名称

// 示例代码：使用Express中间件进行数据验证和清理
const express = require('express');
const app = express();
const bodyParser = require('body-parser');
const { check, validationResult } = require('express-validator');

app.use(bodyParser.json());

app.post('/register', [
  check('email').isEmail().withMessage('Invalid email').custom((value, { req }) => {
    // 自定义验证逻辑
    return User.findOne({ email: value }).then(user => {
      if (user) {
        throw new Error('Email already exists');
      }
      return true;
    });
  })
], (req, res) => {
  const errors = validationResult(req);
  if (!errors.isEmpty()) {
    return res.status(400).json({ errors: errors.array() });
  }
  // 处理注册逻辑
  res.status(200).json({ message: 'Registration successful' });
});

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