Nestjs Best Practices

The nestjs-best-practices skill empowers AI agents to generate, refactor, and debug NestJS applications by adhering to industry-standard architecture patterns. It ensures code aligns with modular design principles, dependency injection strategies, and robust error handling mechanisms specific to the framework.

When to use it

• Scaffold new microservices or monolithic applications that require strict architectural separation of concerns.
• Refactor legacy Node.js codebases to leverage NestJS decorators, guards, interceptors, and pipes for better maintainability.
• Debug complex runtime issues related to module lifecycle management or circular dependencies.
• Generate unit and integration tests following the official testing strategies recommended by the NestJS community.

Key capabilities

• Generates code compliant with the official NestJS architecture (Modules, Controllers, Providers).
• Implements dependency injection using @Injectable() and constructor parameter injection.
• Creates custom decorators, guards, interceptors, and pipes for request/response manipulation.
• Structures projects to support scalable microservices communication via HTTP or gRPC.

Example prompts

• "Create a NestJS module for user authentication that includes a guard for JWT verification and an interceptor for logging."
• "Refactor this existing Express.js route handler into a NestJS controller using dependency injection and input validation pipes."
• "Generate a comprehensive test suite for a service that processes payment transactions, ensuring coverage for edge cases."

Tips & gotchas

Ensure your AI agent understands the distinction between @Injectable() classes and providers to avoid circular dependency errors. When requesting microservices architecture, explicitly specify the communication protocol (e.g., gRPC or HTTP) to get accurate boilerplate code.