Swagger is Gone in .NET 9! Replace It With This.

Summary

This video discusses the removal of Swagger UI from .NET 9's default project templates, which has been replaced by the OpenAPI package. While the underlying OpenAPI specification generation remains, the user-friendly UI is no longer included out-of-the-box. Developers should prepare for this change by understanding that they will need to manually add Swagger UI back using a package like Swashbuckle.AspNetCore if they wish to retain this feature for API visualization and testing.