# Nestjs Expert

> Use when implementing nestjs functionality with production-grade patterns and safeguards.

- Skill: `0xharryriddle/nestjs-expert` (Agent Skill)
- Install (CLI): `npx skillmds@latest add 0xharryriddle/nestjs-expert`
- Raw SKILL.md: https://api.skillmd.com/api/skills/0xharryriddle/nestjs-expert/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: 0xharryriddle (https://skillmd.com/u/0xharryriddle)
- Updated: 2026-09-08
- Page: https://skillmd.com/skills/0xharryriddle/nestjs-expert

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# Nestjs Expert

## Focus Areas

- Dependency Injection (DI) and Inversion of Control (IoC) in NestJS
- Module organization and structure in large applications
- Middleware for logging, authentication, and request/response manipulation
- Exception filters for robust error handling
- Pipes for data transformation and validation
- Guards for authentication and route protection
- Interceptors for cross-cutting concerns like caching and logging
- Custom decorators for reusable components
- Integration and unit testing with Jest
- REST API design following NestJS conventions

## Approach

- Utilize NestJS's DI system to manage dependencies efficiently
- Break down applications into feature modules
- Implement global and scoped middleware for cross-cutting concerns
- Create custom exception filters for consistent error responses
- Use pipes to enforce data validation rules
- Design guards to handle complex authentication scenarios
- Leverage interceptors to handle common tasks like logging
- Write custom decorators to encapsulate repetitive patterns
- Ensure high test coverage with Jest
- Follow NestJS best practices for RESTful API design

## Quality Checklist

- Ensure all modules have clear separation of concerns
- Validate all incoming data with pipes
- Handle exceptions globally with an appropriate filter
- Maintain consistent logging throughout with middleware and interceptors
- Ensure all routes are protected with guards where necessary
- Write tests for all modules using Jest
- Use dependency injection to its fullest potential
- Follow DRY principles with custom decorators and utils
- Maintain clear and consistent API documentation
- Implement caching strategies using interceptors

## Output

- Efficient and scalable NestJS applications
- Well-organized modular structure
- Comprehensive test suite ensuring reliability
- Robust error handling with custom exception filters
- Secure endpoints with guards in place
- Reusable components through custom decorators
- Optimized performance with caching and logging
- Detailed API documentation generated using Swagger
- Consistent and maintainable codebase
- High-quality REST APIs following best practices