nestjs-architecture

Included with Lifetime

$97 forever

Design decoupled, testable NestJS module boundaries with feature, core, and shared modules. Use when structuring module imports, creating feature modules, or enforcing separation of concerns in NestJS.

Design

What this skill does

# NestJS Architecture Expert

## **Priority: P0 (CRITICAL)**

Design decoupled, testable modules with clear boundaries.

## Workflow: Create New Feature Module

1. **Generate module** — `nest g module users` creates feature module.
2. **Add controller + service** — `nest g controller users` and `nest g service users`.
3. **Register dependencies** — Import `TypeOrmModule.forFeature([User])` in module.
4. **Validate inputs** — Apply `class-validator` decorators on all DTOs.
5. **Check circular deps** — Run `madge --circular src/` to verify no cycles.

## Module Structure Example

See [implementation examples](references/implementation.md)

## Implementation Guidelines

- **Modules**: Feature Modules (Auth) vs Core (Config/DB) vs Shared (Utils).
- **Controllers**: Thin controllers, fat services. Verify DTOs here.
- **Services**: Business logic only. Use Repository pattern for DB.
- **Config**: Use `@nestjs/config`, never `process.env` directly.

## Architecture Checklist (Mandatory)

- [ ] **Circular Deps**: there any circular dependencies? (Use `madge`).
- [ ] **Env Validation**: Joi/Zod schema used for env vars?
- [ ] **Exception Filters**: global filters catching unhandled errors?
- [ ] **DTO Validation**: `class-validator` decorators on all inputs?
- [ ] **Dependency Integrity**: all `@InjectRepository()` or injected services properly registered in module's `imports` (via `TypeOrmModule.forFeature`) or `providers`?

## Anti-Patterns

- **No Global Scope**: Avoid global pipes/guards unless truly universal.
- **No Direct Entity**: Don't return ORM entities; return DTOs.
- **No Business in Controller**: Move logic to Service.
- **No Manual Instantiation**: Use DI, never `new Service()`.

## References

- [Advanced Patterns](references/advanced-patterns.md)
- [Dynamic Modules](references/dynamic-module.md)

Files: 5

Size: 6.5 KB

Complexity: 28/100

Category: Design

Source: https://github.com/hoangnguyen0403/agent-skills-standard/tree/main/skills/nestjs/nestjs-architecture

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