backend-patterns

To structure a Node.js API with repository and service layers, separate data access logic into repositories and business logic into services. This pattern enables testability and maintainability across Express, Fastify, and Next.js routes by decoupling database operations from route handlers.

The best way to handle errors in Next.js and Express APIs is implementing centralized error handling. This pattern intercepts middleware errors to return consistent error responses, preventing scattered try-catch blocks and improving reliability across your backend architecture.

The repository pattern prevents N+1 queries by centralizing data access logic, allowing optimized database calls and transaction management. This architectural pattern ensures efficient data fetching within your service layer instead of executing redundant queries per loop iteration.

Yes, you can use these backend design patterns with a Fastify server. The architecture applies repository layers, service layers, caching, and rate limiting across Node.js frameworks including Express, Fastify, and Next.js routes to build scalable and maintainable APIs.

Implement authentication and rate limiting in a Node.js service layer by applying modular design patterns to separate security concerns from business logic. This approach ensures reliable API performance and structured authorization checks across your Express or Fastify routes.

You should add caching and background jobs to your API architecture when optimizing performance and reliability for scalable backends. These patterns offload heavy processing from synchronous API routes, improving response times within your Node.js service layer.