nodejs-backend

A scalable Node.js backend architecture separates core domain logic from infrastructure using a repository pattern, dependency injection, and dedicated API routes to ensure consistent design and maintainability across projects.

The repository pattern in Express or Fastify applications abstracts database access into a dedicated layer, allowing core domain services to remain decoupled from infrastructure concerns for better testability and maintainability.

Test scaffolding for Node.js API projects is set up by incorporating unit and integration testing patterns alongside error handling middleware, accelerating test-driven development across core domain logic and routed HTTP layers.

Yes, you can use dependency injection in a Node.js backend project by wiring core services to HTTP routes at the composition root, standardizing the architecture and enforcing a well-organized project structure.

Yes, this Node.js backend pattern supports both Express and Fastify, providing a repeatable architecture that includes routed HTTP layers, domain-driven core logic, and representative error handling middleware for robust APIs.

Use domain-driven design for Node.js backend development to create a clear separation of core business logic from infrastructure concerns, resulting in a standardized template that enforces testability and consistent project design.