express validator typescript

1// this method create custom express validator using middleware
2
3const { validationResult, check } = require('express-validator')
4
5exports.resultsValidator = (req) => {
6  const messages = []
7  if (!validationResult(req).isEmpty()) {
8    const errors = validationResult(req).array()
9    for (const i of errors) {
10      messages.push(i)
11    }
12  }
13  return messages
14}
15
16exports.registerValidator = () => {
17  return [
18    check('username')
19      .notEmpty()
20      .withMessage('username is required')
21      .not()
22      .custom((val) => /[^A-za-z0-9\s]/g.test(val))
23      .withMessage('Username not use uniq characters'),
24    check('password')
25      .notEmpty()
26      .withMessage('password is required')
27      .isLength({ min: 8 })
28      .withMessage('password must be 8 characters')
29  ]
30}
31
32exports.loginValidator = () => {
33  return [
34    check('username').notEmpty().withMessage('username or email is required'),
35    check('password').notEmpty().withMessage('password is required')
36  ]
37}
38
39// how to use express validator in controller for results message
40const errors = resultsValidator(req)
41  if (errors.length > 0) {
42    return res.status(400).json({
43      method: req.method,
44      status: res.statusCode,
45      error: errors
46    })
47  }
48
49// how to use express validator in route
50route.post('/login', loginValidator(), (req, res) => {
51   return res.status(200).send('Login Sucessfuly');
52});
53
54route.post('/register', registerValidator(), (req, res) => {
55   return res.status(200).send('Register Sucessfuly');
56});

1import { Request } from 'express'
2import { check, validationResult, ValidationError, ValidationChain, Result } from 'express-validator'
3
4export const expressValidator = (req: Request): ValidationError[] => {
5	const errors: Result<ValidationError> = validationResult(req)
6
7	const messages: ValidationError[] = []
8	if (!errors.isEmpty()) {
9		for (const i of errors.array()) {
10			messages.push(i)
11		}
12	}
13	return messages
14}
15
16export const registerValidator = (): ValidationChain[] => [
17	check('email').isEmpty().withMessage('email is required'),
18	check('email').isEmail().withMessage('email is not valid'),
19	check('password').isEmpty().withMessage('password is required'),
20	check('password').isLength({ min: 8 }).withMessage('password must be at least 8 characters')
21]
22
23export const loginValidator = (): ValidationChain[] => [
24	check('email').notEmpty().withMessage('email is required'),
25	check('email').isEmail().withMessage('email is not valid'),
26	check('password').notEmpty().withMessage('pasword is required')
27]
28
29export const emailValidator = (): ValidationChain[] => [
30	check('email').notEmpty().withMessage('email is required'),
31	check('email').isEmail().withMessage('email is not valid')
32]
33
34export const tokenValidator = (): ValidationChain[] => [
35	check('id').notEmpty().withMessage('token is required'),
36	check('id').isBase64().withMessage('token is not valid')
37]
38

1npm install --save express-validator
2