NestJS Extensions

[WIP] A bunch of useful and opinionated filters, modules, pipes... to use with Nest framework. 😻

Setup

npm install nestjs-extensions@latest

Usage

• ApplicationExceptionFilter is a nestjs filter use to catch all exceptions & errors in the application.

  import { ApplicationExceptionFilter } from 'nestjs-extensions';
  // ... other imports
  
  const app = await NestFactory.create();
  
  app.useGlobalFilters(new ApplicationExceptionFilter());

• DtoPipe & Dto is used for validation. Internally it uses class-transformer & class-validator.

  • Step 1 - use the pipe, it requires a nestjs Reflector.

  import { DtoPipe } from 'nestjs-extensions';
  // ... other imports
  
  const app = await NestFactory.create();
  
  app.useGlobalPipes(new DtoPipe(new Reflector()));

  • Step 2 - create a file called create-post.dto.ts

  import { Transform } from 'class-transformer';
  import { IsNotEmpty, IsOptional, IsString } from 'class-validator';
  import { Dto } from 'nestjs-extensions';
  
  @Dto()
  export class CreatePostDto {
    @IsNotEmpty()
    @IsString()
    title!: string;
  
    @IsString()
    @IsOptional()
    description?: string;
  
    @IsNotEmpty()
    @Transform(x => +x)
    count!: number;
  }

  • Step 3 - use it inside your controller

  // ...
  @Controller('posts')
  export class PostsController {
    @Post()
    async createPost(@Body() { title, description, count }: CreatePostDto) {
      return { title, description, count };
    }
  }