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#APIDesign #BackendArchitecture #BackendDevelopment A clean API structure is the foundation of every scalable backend application. In this video, I explain how to design an API the right way for real-world systems — focusing on architecture, responsibilities, and how different layers interact with each other. You’ll learn: • The core layers of an API and their roles • How controllers, services, and data layers interact • Separation of concerns in API design • How good structure improves scalability and maintainability • Common API design mistakes that lead to technical debt These principles apply to Node.js, Express, NestJS, and most modern backend frameworks. If you want to design clean, production-ready APIs, this video is for you.