express-validator optional fields

Question

I got this form with optional email and I'm using express-validator to make a server side validation.

When I submit, it's suposed to validate and then process the data to save it.

routes/users.js

router.post('/save', users.validationRules(), users.save)

controllers/usersController.js

usersController.validationRules = () => {
  return [
    // ...
    // Some other validation rules that works
    // ...
    check('email', 'You need a valid Email')
        .optional()
        .isEmail(),
    // ... More validation rules that also works ...
  ]
}

usersController.save = (req, res) => {

    let errors = validationResult(req)

    console.log(errors);
}

It shows me the error message like if it were ignoring the optional() method. Do you guys have any idea about what is happening or what am I doing wrong?

Answer 1

You can try use .optional({ checkFalsy: true }) to check against falsy values (eg "", 0, false, null).

More about it from the docs