Backend Development

NestJS Patterns

• Module-based architecture
• Dependency injection for all services
• DTOs with class-validator for input validation
• Guards for authentication/authorization
• Interceptors for logging/transformation
• Exception filters for consistent error responses

API Design

• RESTful naming: plural nouns, HTTP verbs
• Consistent response format: { data, meta, errors }
• Pagination for list endpoints
• Proper HTTP status codes (201 created, 204 no content)
• API versioning: /api/v1/