joi_user_schema_validation_quickstart_with_error_handling.ts

1import * as Joi from 'joi';
2
3interface User {
4    username: string;
5    password?: string;
6    birth_year?: number;
7    email?: string;
8}
9
10const schema = Joi.object({
11    username: Joi.string()
12        .alphanum()
13        .min(3)
14        .max(30)
15        .required(),
16
17    password: Joi.string()
18        .pattern(new RegExp('^[a-zA-Z0-9]{3,30}$')),
19
20    birth_year: Joi.number()
21        .integer()
22        .min(1900)
23        .max(2013),
24
25    email: Joi.string()
26        .email({ minDomainSegments: 2, tlds: { allow: ['com', 'net'] } })
27});
28
29const dataToValidate: User = {
30    username: 'abc',
31    birth_year: 1994,
32    email: 'any@example.com'
33};
34
35const { error, value } = schema.validate(dataToValidate);
36
37if (error) {
38    console.error('Validation Error:', error.details);
39} else {
40    console.log('Validated Value:', value);
41}