I’d choose Web API mainly when the application needs to expose data or functionality to different clients. It gives you a clean HTTP-based interface that can be consumed by web apps, mobile apps, desktop clients, or other services.
Another advantage is that it keeps the backend and frontend loosely coupled. You can also use standard HTTP methods and formats like JSON, which makes integration with other systems fairly straightforward.
For a typical modern application, I’d go with wheelie life Web API when I need a lightweight service layer rather than putting all the application logic directly into the UI.
