CODEWITHSUNDEEP
node.jsexpressexpress-validator
kasymbayaman
kasymbayaman

Reputation: 353

Validate two fields with express-validator custom validators

I have two fields: login and password. I use custom validators to validate:

login: {
  isNotNull: { errorMessage: 'Required field' },
  isServiceUser: {
    errorMessage: 'Failed to login',
    options: req.body.password,
  },
},
password: {
  isNotEmpty: { errorMessage: 'Required field' },
}

isServiceUser validates by making http request to another service. How can I validate them both at once and send to client that both fields are invalid?

Upvotes: 2

Views: 6115

Answers (2)

AntiHero
AntiHero

Reputation: 21

It can be implemented this way:

body(['login', 'password']).custom((value) => { // your logic here });

callback provided to custom method will be called two times for each field (login and password)

Upvotes: 1

Mohannad Raslan
Mohannad Raslan

Reputation: 123

You can use custom validation.

Assume you want to check password if exist and user name:

const { check, validationResult } = require('express-validator/check')
app.post(upload.single('customerImage'),[
check('name').custom(async (name, {req}) => {
                // api request for fetching user name
                const res = await getCust(name) 
                // change if condition to make it do what you want
                if(!res && req.body.password === ""){
                     throw new Error('user name or password invalid')
                }
                })], (req, res) => { 
                       const errors = validationResult(req)
                       if(!errors.isEmpty()){
                           return res.status(442).json({ errors: errors.array() })
                       }
                       //do something
                })

You have to change the validation condition as you like.

If you want to use Schema Validation

Upvotes: 2

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