ruflo/examples/user-api/middleware/validation.js

const { body, validationResult } = require('express-validator');

const handleValidationErrors = (req, res, next) => {
  const errors = validationResult(req);
  if (!errors.isEmpty()) {
    return res.status(400).json({ errors: errors.array() });
  }
  next();
};

const validateUser = [
  body('name')
    .trim()
    .notEmpty().withMessage('Name is required')
    .isLength({ min: 2, max: 100 }).withMessage('Name must be between 2 and 100 characters'),
  body('email')
    .trim()
    .notEmpty().withMessage('Email is required')
    .isEmail().withMessage('Must be a valid email address')
    .normalizeEmail(),
  body('age')
    .optional()
    .isInt({ min: 0, max: 150 }).withMessage('Age must be between 0 and 150'),
  handleValidationErrors
];

const validateUserUpdate = [
  body('name')
    .optional()
    .trim()
    .isLength({ min: 2, max: 100 }).withMessage('Name must be between 2 and 100 characters'),
  body('email')
    .optional()
    .trim()
    .isEmail().withMessage('Must be a valid email address')
    .normalizeEmail(),
  body('age')
    .optional()
    .isInt({ min: 0, max: 150 }).withMessage('Age must be between 0 and 150'),
  handleValidationErrors
];

module.exports = {
  validateUser,
  validateUserUpdate
};