Install express-validator code example

Example 1: express-validator

// ...rest of the initial code omitted for simplicity.
const { body, validationResult } = require('express-validator');

app.post('/user', [
  // username must be an email
  body('username').isEmail(),
  // password must be at least 5 chars long
  body('password').isLength({ min: 5 })
], (req, res) => {
  // Finds the validation errors in this request and wraps them in an object with handy functions
  const errors = validationResult(req);
  if (!errors.isEmpty()) {
    return res.status(422).json({ errors: errors.array() });
  }

  User.create({
    username: req.body.username,
    password: req.body.password
  }).then(user => res.json(user));
});

Example 2: express validator

import { Request } from 'express'
import { check, validationResult, ValidationError, ValidationChain, Result, Meta } from 'express-validator'

export const expressValidator = (req: Request): ValidationError[] => {
	const errors: Result<ValidationError> = validationResult(req)

	const messages: ValidationError[] = []
	if (!errors.isEmpty()) {
		for (const i of errors.array()) {
			messages.push(i)
		}
	}
	return messages
}

export const registerValidator = (): ValidationChain[] => [
	check('firstName').notEmpty().withMessage('firstName is required'),
	check('firstName')
		.not()
		.custom((val: string) => /[^a-zA-Z]/gi.test(val))
		.withMessage('firstName cannot include unique character'),
	check('lastName').notEmpty().withMessage('lastName is required'),
	check('lastName')
		.not()
		.custom((val: string) => /[^a-zA-Z]/gi.test(val))
		.withMessage('lastName cannot include unique character'),
	check('email').notEmpty().withMessage('email is required'),
	check('email').isEmail().withMessage('email is not valid'),
	check('password').notEmpty().withMessage('password is required'),
	check('password').isLength({ min: 8 }).withMessage('password must be at least 8 characters'),
	check('location').notEmpty().withMessage('location is required'),
	check('location')
		.not()
		.custom((val: string) => /[^a-zA-Z]/gi.test(val))
		.withMessage('location cannot include unique character'),
	check('phone').notEmpty().withMessage('phone is required'),
	check('phone').isLength({ min: 10 }).withMessage('phone number must be at least 10 characters'),
	check('phone').isLength({ max: 12 }).withMessage('phone number must be at least 12 characters'),
	check('phone').isMobilePhone('id-ID').withMessage('phone number is not valid')
]

export const loginValidator = (): ValidationChain[] => [
	check('email').notEmpty().withMessage('email is required'),
	check('email').isEmail().withMessage('email is not valid'),
	check('password').notEmpty().withMessage('pasword is required')
]

export const emailValidator = (): ValidationChain[] => [
	check('email').notEmpty().withMessage('email is required'),
	check('email').isEmail().withMessage('email is not valid')
]

export const tokenValidator = (): ValidationChain[] => [
	check('token').notEmpty().withMessage('token is required'),
	check('token').isBase64().withMessage('token is not valid')
]

export const passwordValidator = (): ValidationChain[] => [
	check('password').notEmpty().withMessage('password is required'),
	check('password').isLength({ min: 8 }).withMessage('password must be at least 8 characters'),
	check('password')
		.not()
		.custom((value: string, { req }: Meta) => req.body.cpassword !== value)
		.withMessage('confirm password is not match with password'),
	check('cpassword').notEmpty().withMessage('cpassword is required'),
	check('cpassword').isLength({ min: 8 }).withMessage('cpassword must be at least 8 characters')
]