Nestjs API Standards

NestJS API Standards & Common Patterns

Generic Response Wrapper

• Concept: Standardize all successful API responses.
• Implementation: Use TransformInterceptor to wrap data in { statusCode, data, meta }.

Pagination Standards (Pro)

• DTOs: Use strict PageOptionsDto (page/take/order) and PageDto<T> (data/meta).
• Swagger Logic: Generics require ApiExtraModels and schema path resolution.
• Reference: See Pagination Wrapper Implementation for the complete ApiPaginatedResponse decorator code.

Custom Error Response

• Standard Error Object:

  export class ApiErrorResponse {
    @ApiProperty()
    statusCode: number;
  
    @ApiProperty()
    message: string;
  
    @ApiProperty()
    error: string;
  
    @ApiProperty()
    timestamp: string;
  
    @ApiProperty()
    path: string;
  }
  

• Docs: Apply @ApiBadRequestResponse({ type: ApiErrorResponse }) globally or per controller.

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