nestjs-expert

Resolve architecture, testing, performance, and debugging issues in Nest.js applications.

1|Updated Feb 2, 2026

Search Tags:#testing #authentication #middleware #dependency injection #nestjs #database integration

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npx skills add https://github.com/samChang72/custom-skills --skill nestjs-expert-samchang72

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Skill: nestjs-expert
Source: https://github.com/samChang72/custom-skills/tree/main/gemini/skills/nestjs-expert
Command: npx skills add https://github.com/samChang72/custom-skills --skill nestjs-expert-samchang72

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill provides expert-level support for Nest.js applications, addressing architecture, testing, performance optimization, and debugging issues.

Core Features & Use Cases

Module Architecture & Dependency Injection: Expertly resolves circular dependencies, provider scope conflicts, and module imports.
Controllers & Request Handling: Manages route conflicts, DTO validation, and response serialization.
Middleware, Guards, Interceptors & Pipes: Ensures proper execution order, context access, and async operations.
Testing Strategies: Implements Jest/Supertest for unit, integration, and e2e testing.
Database Integration: Integrates TypeORM/Mongoose for robust database operations.
Authentication & Authorization: Sets up Passport.js for secure authentication and authorization.
Configuration & Environment Management: Manages environment variables and configuration validation.
Error Handling & Logging: Implements exception filters and logger configuration.
Problem-Specific Approaches: Provides solutions for common issues like circular dependencies, JWT authentication, and database connection errors.
Quick Reference Patterns: Offers code snippets for dependency injection, global modules, and dynamic modules.
Performance Optimization: Implements caching strategies, database optimization, and request processing improvements.
External Resources: Links to Nest.js documentation, testing tools, and authentication best practices.
**Quick Start Utilize the nestjs-expert skill to diagnose and resolve a specific issue in your Nest.js application, such as circular dependencies or JWT authentication problems.

Frequently Asked Questions about nestjs-expert

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

FAQPage Schema

How do I resolve circular dependencies in Nest.js module architecture?▼

To resolve circular dependencies in Nest.js, you can apply forward references or refactor module imports. This ensures proper dependency injection and prevents provider scope conflicts and initialization errors in enterprise-grade applications.

How do I set up JWT authentication and authorization in Nest.js?▼

Setting up JWT authentication in Nest.js involves integrating Passport.js with custom guards. This secures your endpoints by validating tokens and managing authorization strategies effectively within your application's middleware pipeline.

What is the best way to test Nest.js controllers and providers?▼

The best way to test Nest.js applications is using Jest and Supertest. This approach supports unit, integration, and e2e testing by mocking dependency injection and validating request handling, DTO validation, and response serialization.

Does this Nest.js guidance cover database integration with TypeORM and Mongoose?▼

Yes, this covers database integration for both TypeORM and Mongoose. It provides solutions for robust database operations, connection errors, and optimization strategies to ensure reliable data persistence in your Node.js application.

How do I ensure proper execution order for Nest.js middleware, guards, and interceptors?▼

Proper execution order for Nest.js middleware, guards, and interceptors is achieved by understanding the request lifecycle. You must correctly configure context access and async operations to ensure pipes and interceptors execute sequentially.