Class Decorator ​

The ClassValidator decorator is used at the class level to enable validation of its properties using the decorators provided by the REST Data Validator library. This decorator is essential for activating and applying the defined property validators within a class.

Usage ​

To use the ClassValidator, simply decorate your class with @ClassValidator. This signals the library to perform validation on the instance based on the property validators defined within the class.

Example ​

import {
  ClassValidator,
  StringValidator,
  NumberValidator,
} from "rest-data-validator";

@ClassValidator
class User {
  @String({ minLength: 2, maxLength: 30 })
  name: string;

  @Number({ min: 18 })
  age: number;
}

const user = new User();
user.name = "Jane Doe";
user.age = 25;

In this example, the User class is decorated with @ClassValidator, which enables validation for the name and age properties using the StringValidator and NumberValidator, respectively. The validate function contained within ValidationUtils used by ClassValidator to check if the user instance meets the specified validation criteria.

Integrating with Application Logic ​

The ClassValidator decorator and associated property validators can be integrated into application logic to ensure data integrity before processing or persisting data, such as before saving a user to a database or before performing operations that depend on valid data.

By using ClassValidator, developers can define a clear, declarative validation schema directly within their class models, improving maintainability, readability, and reducing the likelihood of invalid data being processed by the application.