API-First Approach is a methodology that places APIs at the center of the design process in modern web development. This approach advocates that APIs are not just add-ons, but rather the fundamental building blocks of the application. The answer to the question of What is API-First Approach? is to speed up the development process, increase consistency, and create a more flexible architecture. Its key components include well-defined contracts, solid documentation, and developer-centric design. As the role of APIs in web development continues to grow, attention should be paid to security, performance, and scalability. Improving the developer experience, facilitating information management, and considering future phases are also critical. Tips and suggestions for overcoming challenges in API design are provided, and the future of APIs is...