nodejs-backend-patterns

A production-ready Node.js backend uses a layered architecture separating controllers, services, and repositories. This pattern ensures maintainability and scalability by isolating business logic from data access, supporting both Express.js and Fastify frameworks.

Robust error handling in Express.js and Fastify involves implementing custom error classes and a global error handler. This mechanism catches exceptions systematically across your API development lifecycle, preventing application crashes and ensuring consistent error responses.

Authentication and rate limiting are implemented as security middleware within Node.js microservices. Configuring these middleware layers in frameworks like Express.js or Fastify protects API endpoints from unauthorized access and mitigates abusive traffic spikes.

Yes, TypeScript can be used with both PostgreSQL and MongoDB in a Node.js backend. Database integration patterns provide structured repository layers for data access, allowing you to maintain type safety across different database systems in your microservices.

Dependency injection works effectively with Fastify and Express.js to decouple modules in layered architecture. Injecting services into controllers rather than importing them directly simplifies unit testing and manages complex dependencies in scalable Node.js applications.

Choose GraphQL over REST for your Node.js API design when clients require flexible, precise data retrieval to avoid over-fetching. The implementation covers best practices for both formats, allowing you to select based on specific client data querying needs.