class_validator_post_model_with_decorators_and_validation.ts

1import {
2  validate,
3  validateOrReject,
4  Contains,
5  IsInt,
6  Length,
7  IsEmail,
8  IsFQDN,
9  IsDate,
10  Min,
11  Max,
12} from 'class-validator';
13
14export class Post {
15  @Length(10, 20)
16  title: string;
17
18  @Contains('hello')
19  text: string;
20
21  @IsInt()
22  @Min(0)
23  @Max(10)
24  rating: number;
25
26  @IsEmail()
27  email: string;
28
29  @IsFQDN()
30  site: string;
31
32  @IsDate()
33  createDate: Date;
34}
35
36let post = new Post();
37post.title = 'Hello'; // should not pass
38post.text = 'this is a great post about hell world'; // should not pass
39post.rating = 11; // should not pass
40post.email = 'google.com'; // should not pass
41post.site = 'google.com'; // should pass
42
43validate(post).then(errors => {
44  // errors is an array of validation errors
45  if (errors.length > 0) {
46    console.log('validation failed. errors: ', errors);
47  } else {
48    console.log('validation succeed');
49  }
50});
51
52validateOrReject(post).catch(errors => {
53  console.log('Promise rejected (validation failed). Errors: ', errors);
54});