backend-dev-guidelines

Structure a scalable NestJS backend using a layered architecture that isolates responsibilities across controllers, services, and repositories. This blueprint enforces module isolation, consistent coding standards, and dependency injection wiring to keep projects maintainable as they grow.

Handle exceptions globally in your NestJS application by implementing a centralized exception handling layer. This approach consolidates error management, preventing scattered try-catch blocks and ensuring consistent, structured error responses across all modules.

Set up structured logging and configuration management in NestJS by applying reusable architectural patterns. This ensures consistent log formats for debugging and centralizes environment variables, keeping backend configuration secure and maintainable.

Yes, you can use the repository pattern with NestJS for database operations. The guidelines provide a blueprint for mapping data access logic into repository classes, isolating service layers from direct database interactions and improving testability.

Your NestJS backend needs validation guardrails and DTOs to prevent unsafe operations and ensure data integrity. Enforcing validation at the boundary layer stops malformed requests from reaching core business logic, securing the application against unexpected inputs.