nodejs-backend-patterns

Structure a production-ready Node.js backend using layered architecture, dependency injection, and separated concerns to ensure scalability and maintainability across REST APIs and microservices. This approach isolates business logic from data access and routing.

Implement JWT authentication in Express or Fastify by applying middleware patterns that validate tokens and manage secure auth flows before reaching route handlers. This ensures consistent request processing and robust identity verification.

Dependency injection in Node.js microservices works by decoupling component instantiation from usage, allowing services to receive dependencies externally. This pattern facilitates clean separation of concerns and simplifies unit testing.

Yes, you can use these Node.js backend patterns for both SQL and NoSQL database integration through standardized data access layers. This abstraction ensures consistent database communication regardless of the underlying storage engine.

Handle errors and validation in a Node.js REST API by implementing centralized middleware that intercepts exceptions and validates request payloads. This guarantees uniform error responses and prevents unhandled application crashes.

You need either Express or Fastify to apply these architecture patterns, as the TypeScript code examples target both frameworks for building REST APIs and microservices. They provide the underlying HTTP server infrastructure.