Asynchronous validation

Validation tests can be asynchronous (talk to the database etc..) in that case you just use the validateAsync function and handle the promise that is returned when all validation tests are done.

const { validate, validation } = require('validar')

const person = {
  name: 'Adam',
}

const asyncNameTest = (value, field, path, objectUnderTest) => {
  return new Promise((resolve, reject) => {
    // resolve later - maybe query the DB...
    resolve(typeof value === 'string' && value.length > 5)
  })
}

const validators = {
  name: validation(asyncNameTest),
}

validateAsync(validators, person)
  .then(result => {
    console.log(result)
  })
  .catch(error => {
    console.log('something went wrong')
  })

Result of the validation will always be accessible via then ( resolved promise), even when validation fails. Catch block us used for errors that come from the async tests (if the database is unavailable, connection timeout, etc)

asynchronous runkit example

Check out documentation for more information about: