API Development with Express.js and REST Best Practices

Express.js is the most popular Node.js framework for building RESTful APIs. A well-designed API follows REST conventions: use proper HTTP methods (GET, POST, PUT, DELETE), meaningful URLs, and appropriate status codes. Implement middleware for authentication (JWT tokens), request validation, and error handling. Structure your code with separate route files, controllers for business logic, and services for data access. Always version your APIs, document endpoints with tools like Swagger, and implement rate limiting for security. These practices ensure your APIs are professional and production-ready.