Explain key backend security concepts, including authentication, authorization, JWT-based access control, and API route protection.

Implement secure API workflows using JWT authentication, middleware, role-based access control, CORS, and rate limiting.

Organize Node.js applications by separating routes, controllers, and services, while applying logging, error handling, and configuration practices.

Develop Node.js applications by testing API endpoints, preparing for deployment, monitoring performance, and optimizing backend operations.