nestjs-expert

Creates and configures NestJS modules, controllers, services, DTOs, guards, and interceptors for enterprise-grade TypeScript backend applications. Use when building NestJS REST APIs or GraphQL services, implementing dependency injection, scaffolding modular architecture, adding JWT/Passport authentication, integrating TypeORM or Prisma, or working with .module.ts, .controller.ts, and .service.ts files. Invoke for guards, interceptors, pipes, validation, Swagger documentation, and unit/E2E testing in NestJS projects.

1.01x

Quality

92%

Does it follow best practices?

Impact

91%

1.01x

Average score across 6 eval scenarios

Securityby

Passed

No known issues

Evaluation results

100%

Product Catalog API

Controller Swagger docs and DTO validation

Criteria

Without context

With context

ApiTags on controller

100%

ApiOperation on endpoints

100%

ApiResponse with status codes

100%

ApiProperty on DTO fields

100%

class-validator decorators

100%

PartialType or OmitType for update DTO

100%

Global ValidationPipe whitelist

100%

Global ValidationPipe transform

100%

ParseUUIDPipe on id params

100%

HttpCode NO_CONTENT on DELETE

100%

No any type

100%

No secrets in response

100%

77%

Order Processing Service

Service DI, logger, error handling, unit tests

Criteria

Without context

With context

Constructor DI

100%

Logger instance

NestJS HTTP exceptions

100%

Test.createTestingModule

100%

jest.fn() mocks

44%

afterEach clearAllMocks

NotFoundException test case

100%

Module exports service

100%

@Injectable decorator

100%

No any type

100%

DTOs for inputs

100%

83%

-1%

Blogging Platform Authentication

JWT auth, guards, roles, configuration

Criteria

Without context

With context

bcrypt cost factor 10

100%

JWT payload fields

100%

Access token expiry 15m

88%

100%

Refresh token expiry 7d

ConfigService for JWT_SECRET

100%

Bearer token extraction

100%

Global guard via APP_GUARD

100%

@Public() decorator

66%

55%

@Roles() with RolesGuard

66%

55%

Password not in response

100%

No hardcoded secrets

100%

98%

-2%

Migrate Legacy Express API to NestJS

Express to NestJS migration patterns

Criteria

Without context

With context

Auth via Guard not middleware

100%

Logging via Interceptor not middleware

100%

Constructor DI, no new keyword

100%

class-validator DTO decorators

100%

NestJS HTTP exceptions

100%

NestJS module directory structure

100%

Global ValidationPipe with whitelist and transform

100%

@Injectable on service

100%

No raw req.body in services

100%

Guard uses CanActivate interface

100%

77%

Interceptor uses NestInterceptor interface

100%

92%

Order Management API — Advanced Validation

Nested DTO validation and custom validation decorators

Criteria

Without context

With context

@ValidateNested with @Type

100%

@ArrayMinSize on array field

100%

Custom registerDecorator

100%

@Transform sanitization

100%

PartialType or OmitType for update DTO

100%

PickType for subset DTO

ValidationPipe whitelist

100%

ValidationPipe forbidNonWhitelisted

100%

ValidationPipe transform

100%

@ApiProperty on all DTO fields

100%

No any type in DTOs

57%

100%

DTO files in dto/ subdirectory

100%

Add Observability and Versioning to a NestJS API

Interceptors, exception filters, versioning, and E2E tests

Criteria

Without context

With context

NestInterceptor implementation

100%

Interceptor uses Observable pipe and tap

100%

Interceptor Logger named after class

100%

ExceptionFilter implementation

100%

Exception filter response shape

100%

Global prefix api

100%

URI versioning enabled

100%

E2E test uses createNestApplication

100%

E2E test uses supertest

100%

E2E test ValidationPipe

100%

E2E afterAll closes app

100%

Output template order

100%

Repository: jeffallan/claude-skills
Commit: 5b76101

Evaluated: 27 days ago
Agent: Claude Code
Model: Claude Sonnet 4.6

Table of Contents

Product Catalog API Order Processing Service Blogging Platform Authentication Migrate Legacy Express API to NestJS Order Management API — Advanced Validation Add Observability and Versioning to a NestJS API

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