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express validator without express

See original GitHub issue

express-validator is awesome, why just express!

I recently used express-validator in my express app and it was the best solution and now I am working on the front-end of that app with react. but I miss express-validator functionality in front-end for form validation.

I searched a lot on the net but I can’t find a way to implement it on my front-end is there a way? if there is no way so why keep this powerful thing on just express?

a separated library may be the solution

although I know that the express-validator uses validator.js under the hood but it can be very nice to have something like validation chains in the web apps something like :

import {createValidator} from 'the-name-for-separated-library'

const validator=createValidator([
    .isEmail().withMessage('invalid email')

const validationResult=validator.validate({
    'some-field':'an invalid email'

if (!validationResult.isEmpty())

Issue Analytics

  • State:closed
  • Created 3 years ago
  • Comments:5 (2 by maintainers)

github_iconTop GitHub Comments

chinesedfancommented, Oct 30, 2020

If were familiar with how express middlewares run, you can reuse those APIs without changes in express-validator. I will show the main process and you can wrap them as a function as you wish. Not tested but should able to work.

const { body, validationResult } = require('express-validator')

// prepare an object
const req = {
  body: {} // put the data to be validated here

// prepare validators(middlewares)
const validators = [

// execute them and check the result 
  // empty `res` and `next` => v(req, {}, () => {}))
).then(() => {
  const errors = validationResult(req)
fedecicommented, Dec 27, 2020

Closing this /cc @gustavohenke

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