Swagger UI is integrated to ASP.NET Zero by default. You can browse Swagger UI from http://localhost:22742/swagger/ui/ URL.
Notice that this is working in the server-side Host project.
The below page is the default page of server side API application where you can see all available API endpoints:
.Web.Host project contains a basic login page. If you login on this page, you can execute actions on Swagger UI which requires authentication.