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AratKruglik
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decorator-patterns

Select and compose NestJS built-in decorators for controllers, guards, and interceptors.

9|1|Updated Jun 16, 2026
Search Tags:#metadata#composition#nestjs#decorators#reflector#param-decorators#setmetadata
One-click install
npx skills add https://github.com/AratKruglik/antigravity-sdlc --skill decorator-patterns
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: decorator-patterns
Source: https://github.com/AratKruglik/antigravity-sdlc/tree/main/plugins/nestjs-plugin/skills/decorator-patterns
Command: npx skills add https://github.com/AratKruglik/antigravity-sdlc --skill decorator-patterns

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

NestJS projects often suffer from unclear decorator usage and tangled metadata when composing guards, interceptors, routes, and custom decorators. This skill clarifies which built-in decorators to use, how to create custom parameter decorators with createParamDecorator, and how to compose decorators with applyDecorators to reduce boilerplate and avoid common pitfalls.

Core Features & Use Cases

  • Built-in class-, method-, and parameter-level decorators and how to apply them to controllers, services, and routes.
  • Custom param decorators via createParamDecorator and integration with Reflector to read metadata at runtime.
  • Metadata composition with applyDecorators and example meta-decorators to reduce boilerplate.
  • Guidance on common patterns and anti-patterns to avoid misconfigurations and DI/routing bugs.

Quick Start

Review the examples and implement a small NestJS demo with a custom @CurrentUser decorator and a Roles guard applied to a controller.

Frequently Asked Questions about decorator-patterns

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I create custom param decorators in NestJS?▼

Create custom param decorators in NestJS using the createParamDecorator function, integrating with Reflector to read metadata at runtime. This approach clarifies which built-in decorators to use for controllers, services, and routes.

What's the best way to compose multiple NestJS decorators to reduce boilerplate?▼

Compose multiple NestJS decorators using applyDecorators to reduce boilerplate. This method combines class, method, and parameter-level decorators, preventing misconfigurations and routing bugs while keeping controller code clean and scalable.

How does SetMetadata work with Reflector in NestJS guards and interceptors?▼

SetMetadata attaches custom metadata to routes, which Reflector retrieves at runtime in guards and interceptors. This mechanism enables role-based access control and route-specific configurations without hardcoding logic into controllers.

Can I combine custom NestJS decorators with built-in guards and interceptors?▼

Yes, you can combine custom NestJS decorators with built-in guards and interceptors. Custom decorators like @CurrentUser integrate with roles guards, applying metadata that guards read to enforce access control across routes.

What are common anti-patterns when using decorators in NestJS controllers?▼

Common NestJS decorator anti-patterns include misconfiguring dependency injection, tangling metadata composition, and incorrect route parameter binding. Avoid these by following established patterns for custom decorators and Reflector usage.

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