nestjs

nestjs

Build structured server-side apps with NestJS.

Architecture

• Modules organize feature domains
• Controllers handle HTTP requests
• Providers (services) contain business logic
• Dependency injection via constructor injection

Decorators & Guards

• Guards for auth/role-based access control
• Interceptors for request/response transformation
• Pipes for validation and transformation
• Exception filters for structured error responses

OpenAPI / Swagger

• @nestjs/swagger decorators for API docs
• DTO classes with class-validator decorators
• Auto-generated Swagger UI at /api

Database

• TypeORM or Prisma integration via modules
• Repository pattern with @InjectRepository
• Migrations for schema versioning

Testing & Microservices

• Jest with Test.createTestingModule
• Microservices via @nestjs/microservices (TCP, Redis, RabbitMQ, Kafka)
• Hybrid apps with HTTP + microservice