A NestJS utility library providing a streamlined approach to defining Swagger API property decorators. This library simplifies type declaration, format specification, and the addition of constraints for your NestJS models.

Key Features:

Types: Conveniently define properties as Number, Integer, String, or Boolean. Formats: Precisely set formats like Float, Double, Int32, Int64, Date, DateTime, Email, UUID, and more. Constraints: Add validation rules for minimum/maximum values, multiples, and regular expression patterns. Flexibility: Use globals for common settings like Required, NotRequired, IsArray, Null, etc. Chainable API: Build concise and expressive decorators with a fluent interface.

Installation

npm install nestjs-swagger-api-decorator

Usage Example

import { ApiProp } from 'nestjs-swagger-api-decorator';

class User {
  @ApiProp('User ID').Integer.Min(1).Pb
  id: number;

  @ApiProp('Username').String.Pattern(/^[a-zA-Z0-9_-]+$/).Pb
  username: string;

  @ApiProp('Email Address').Email.Pb
  email: string;
}

Explanation of Utility

The ApiProp function serves as the heart of this library. It encapsulates a class that implements various interfaces to enable a powerful chainable API. This allows you to succinctly define Swagger properties for your NestJS models.

Contributing

We welcome contributions to improve this library! Feel free to open pull requests or issues for bug fixes, enhancements, and suggestions.

Comparision

Without Library

export class Dto {
  @ApiProperty({ description: 'User ID', type: 'integer', minimum: 1 })
  id: number;
    
  @ApiProperty({ description: 'Username', type: 'string', pattern: '^[a-zA-Z0-9_-]+$' })
  username: string;
    
  @ApiProperty({ description: 'Email Address', type: 'string', format: 'email' })
  email: string;
}

With Library

class Dto {
  @ApiProp('User ID').Integer.Min(1).Pb
  id: number;

  @ApiProp('Username').String.Pattern(/^[a-zA-Z0-9_-]+$/).Pb
  username: string;

  @ApiProp('Email Address').Email.Pb
  email: string;
}