backend-dev-guidelines

A scalable Node.js backend uses a layered architecture separating Routes, Controllers, Services, and Repositories to enforce strict separation of concerns and prevent architectural drift in microservices.

The canonical directory structure for production-grade Node.js microservices organizes code into routes, controllers, services, repositories, and centralized config folders to ensure maintainable and consistent project governance.

Centralized error handling and observability with Sentry in Express is implemented by integrating Sentry monitoring alongside Zod validation to capture errors and validate inputs across backend services.

This Node.js backend guideline works with Prisma and dependency injection by codifying DI patterns alongside repository layers, ensuring scalable data access and maintainable service architecture.

The best way to enforce consistent naming conventions and Zod validation in Node.js is by adopting opinionated backend development standards that codify strict rules across controllers and services.

You should refactor legacy Node.js code into a layered architecture when preventing architectural drift and ensuring reliable, maintainable services becomes critical for team scaling and project governance.