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class-validator

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class-validator

Decorator-based property validation for classes.

  • 0.14.1
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2.7M
decreased by-26.26%
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2
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What is class-validator?

The class-validator package is a TypeScript and JavaScript library that allows for validation of classes and objects using decorators and non-decorator based validation. It is commonly used to ensure data integrity before persistence or processing and is particularly useful when working with class-based models.

What are class-validator's main functionalities?

Declarative Validation Decorators

Allows the use of decorators to declare validation rules directly in the class model. For example, ensuring a property is not empty, is an integer, or is a valid email address.

{"@IsNotEmpty()": "public name: string;", "@IsInt()": "public age: number;", "@IsEmail()": "public email: string;"}

Custom Validation Classes

Enables the creation of custom validation classes that implement the ValidatorConstraintInterface. This allows for complex and custom validation logic that can be reused across different class properties.

{"@ValidatorConstraint({ async: false })": "class IsLongerThanConstraint implements ValidatorConstraintInterface { validate(text: string, args: ValidationArguments) { return text.length > args.constraints[0]; } defaultMessage(args: ValidationArguments) { return 'Text is too short. Should be longer than ' + args.constraints[0] + ' characters'; } }", "@ValidatorConstraint()": "@IsLongerThan(10, { message: 'Text must be longer than 10 characters' }) public text: string;"}

Validation of Nested Objects

Supports validation of nested objects using the ValidateNested decorator, ensuring that the properties of the nested objects also adhere to their respective validation rules.

{"@ValidateNested()": "@Type(() => SubClass) public nested: SubClass;"}

Asynchronous Validation

Provides asynchronous validation functions like validateOrReject, which can handle async validators and return a promise that either resolves if the object is valid or rejects with the validation errors.

{"@IsEmail({}, { message: 'Invalid email' })": "public email: string;", "validateOrReject(someObject)": ".catch(errors => { console.log('Promise rejected (validation failed). Errors: ', errors); });"}

Manual Validation

Allows for manual validation of objects without using decorators by calling the validate function, which returns a promise containing any validation errors.

{"validate(someObject)": ".then(errors => { if (errors.length > 0) { console.log('Validation failed: ', errors); } else { console.log('Validation succeed'); } });"}

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Package last updated on 12 Jan 2024

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