NestJS Module Architecture

This skill defines the responsibilities of the core module files. A module consists of:

1. Service (.service.ts): Business logic, calculations, and DTO transformation.
2. Controller (.controller.ts): HTTP routing, documentation (Swagger), and request delegation.
3. Module (.module.ts): Dependency Injection wiring.

1. Service Pattern (.service.ts)

Responsibilities:

• Injects the Repository to access data.
• Implements business rules (e.g., hashing passwords, sanitizing inputs).
• Transforms raw database results into clean objects (e.g., removing sensitive fields).
• Throws HTTP exceptions (NotFoundException, ConflictException).
• NEVER accesses the database directly (always use the Repository).