nodejs-backend

Structure Node.js backends using layered architecture with dependency injection, separating core business logic from infrastructure. This ensures APIs, validation, and error handling remain maintainable and testable as the codebase grows.

Handle errors and validation in Express or Fastify APIs by enforcing validated request inputs and consistent domain error handling. This guarantees reliable HTTP responses and separates validation logic from core business rules.

Yes, this backend architecture approach applies to both Express and Fastify. It structures route handlers, middleware, and server setup identically, ensuring clear separation between HTTP concerns and domain logic.

Test Node.js backend services by creating focused unit tests for business logic and integration tests for HTTP APIs. This validates route handlers, middleware, and database repositories without coupling tests to infrastructure.

Dependency injection for database repositories decouples parameterized database access from business logic. This enables asynchronous control flow, supports transactions, and allows isolated unit testing without live database connections.

Implement graceful shutdown practices in a Node.js API to ensure reliable connection termination during deployments or failures. This prevents data loss during transactions and stabilizes asynchronous control flow.