Joi validation example

assertJoi.js

const schema = Joi.number().min(18).max(130);

const age = 20;
Joi.assert(age, schema);

validateJoi.js

const userSchema = {
  id: Joi.number().required(),
  name: Joi.string().required(),
  address1: Joi.string(),
  address2: Joi.string().optional().allow(''),
  email: Joi.string().email().required(),
  language: Joi.string().valid(['pl', 'en']).required(),
  login: Joi.string().required(),
  password: Joi.string().min(5).required(),
  repeatPassword: Joi.any().valid(Joi.ref('password')).required().options({ language: { any: { allowOnly: 'Must match password.' } } }),
  
  // phone is required, a string of the format XXX-XXX-XXXX
  phone: Joi.string().regex(/^\d{3}-\d{3}-\d{4}$/).required(),

  // birthday must be a valid ISO-8601 date
  // dates before Jan 1, 2004 are not allowed
  birthday: Joi.date().max('1-1-2004').iso(),
  
  // accepts a valid UUID v4 string
  uuid: Joi.string().guid({version: 'uuidv4'}),
  
  // cardNumber must be a valid number
  cardNumber: Joi.string().creditCard(),
};

const clearlyNotUser = {
  id: 123,
  name: 'Jan Kowalski',
  address1: 'ul. Długa 2',
  address2: '',
  email: 'jan@kowalski.pl',
  language: 'pl',
  login: 'hello',
  password: 'secret',
  repeatPassword: 'secret',
  phone: '123-456-7890',
  birthday: '10-12-2015'
};

Joi.validate(userSchema, schema, {abortEarly: false}, (err, val) => {
  if (err) {
    console.log(err);
  } else {
    console.log('Data ok.');
  }
});