express validator check vs body

1Same as check([fields, message]), but only checking req.body.

1// ...rest of the initial code omitted for simplicity.
2const { body, validationResult } = require('express-validator');
3
4app.post('/user', [
5  // username must be an email
6  body('username').isEmail(),
7  // password must be at least 5 chars long
8  body('password').isLength({ min: 5 })
9], (req, res) => {
10  // Finds the validation errors in this request and wraps them in an object with handy functions
11  const errors = validationResult(req);
12  if (!errors.isEmpty()) {
13    return res.status(422).json({ errors: errors.array() });
14  }
15
16  User.create({
17    username: req.body.username,
18    password: req.body.password
19  }).then(user => res.json(user));
20});
21