83 lines
2.3 KiB
Markdown
83 lines
2.3 KiB
Markdown
---
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title: Organize by Feature Modules
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impact: CRITICAL
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impactDescription: '3-5x faster onboarding and development'
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tags: architecture, modules, organization
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---
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## Organize by Feature Modules
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Organize your application into feature modules that encapsulate related functionality. Each feature module should be self-contained with its own controllers, services, entities, and DTOs. Avoid organizing by technical layer (all controllers together, all services together). This enables 3-5x faster onboarding and feature development.
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**Incorrect (technical layer organization):**
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```typescript
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// Technical layer organization (anti-pattern)
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src/
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├── controllers/
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│ ├── users.controller.ts
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│ ├── orders.controller.ts
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│ └── products.controller.ts
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├── services/
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│ ├── users.service.ts
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│ ├── orders.service.ts
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│ └── products.service.ts
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├── entities/
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│ ├── user.entity.ts
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│ ├── order.entity.ts
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│ └── product.entity.ts
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└── app.module.ts // Imports everything directly
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```
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**Correct (feature module organization):**
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```typescript
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// Feature module organization
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src/
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├── users/
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│ ├── dto/
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│ │ ├── create-user.dto.ts
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│ │ └── update-user.dto.ts
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│ ├── entities/
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│ │ └── user.entity.ts
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│ ├── users.controller.ts
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│ ├── users.service.ts
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│ ├── users.repository.ts
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│ └── users.module.ts
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├── orders/
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│ ├── dto/
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│ ├── entities/
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│ ├── orders.controller.ts
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│ ├── orders.service.ts
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│ └── orders.module.ts
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├── shared/
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│ ├── guards/
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│ ├── interceptors/
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│ ├── filters/
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│ └── shared.module.ts
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└── app.module.ts
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// users.module.ts
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@Module({
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imports: [TypeOrmModule.forFeature([User])],
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controllers: [UsersController],
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providers: [UsersService, UsersRepository],
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exports: [UsersService], // Only export what others need
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})
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export class UsersModule {}
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// app.module.ts
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@Module({
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imports: [
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ConfigModule.forRoot(),
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TypeOrmModule.forRoot(),
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UsersModule,
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OrdersModule,
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SharedModule,
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],
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})
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export class AppModule {}
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```
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Reference: [NestJS Modules](https://docs.nestjs.com/modules)
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