Express-Validator不执行检查

Question

I am developing a simple program using Express. I have added Express-Validator to carry out checks on an EJS index file

Declaration:

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

Usage:

//This is to post the added customer
app.post('/users/add',
check('first_name').isLength({min:5}).withMessage('Name min 5 char'), (req, res) => {

});

Test: I am entering a 3 character name in the name field, but this is not being caught.

Answer 1

As of v5.3.1 (latest version), express-validator doesn't automatically respond to the request for you.

The check() function runs the checks you configure on the fields that match, and stores the errors in the request.
Then, you have to use validationResult() in order to find out if any of your validations failed, like this:

app.post('/users/add', [
  check('first_name').isLength({ min: 5 }).withMessage('Name min 5 char')
], (req, res) => {
  // Finds the validation errors in this request and wraps them in an object with handy functions
  const errors = validationResult(req);
  if (!errors.isEmpty()) {
    return res.status(422).json({ errors: errors.array() });
  }

  // Proceed and create the user
});

More available in the Getting Started guide and the Validation Result API .