If you’ve built a few .NET APIs, you’ve probably done authentication more than once. JWT setup login and register endpoints protecting routes maybe adding roles It works, but every time I started a new project, I found myself repeating the same setup again. After doing this a few times, I decided to settle on a structure that I can reuse and understand without digging through tutorials. This is the approach I use now. The goal I’m not trying to build a full identity system. I just want: a clean login and register flow JWT authentication that works refresh tokens so users don’t get logged out constantly a structure that doesn’t turn into a mess later The structure I keep things split into simple layers. Api Application Domain Infrastructure Shared Nothing fancy. Just enough separation so things don’t get mixed together. The API handles HTTP and controllers. The Application layer contains the logic like login and register. The Domain has the core models like User and Role.…