.NET 9 OpenAPI - Part 2 now finally working in .NET 9

How to use the new built-in OpenAPI support in .NET 9, including build-time generation, linting, and Swagger UI integration.

.NET 9 OpenAPI - Part 2 In part 1 (youtu.be/m4qAZifm42o) we took a deeper look into the existing OpenAPI world using .NET 8 and Swagger. Now we finally use the new .NET 9 built-in functionallity. EDIT: The schema resolving error at [01:23:02] is already addressed in GitHub at github.com/dotnet/aspnetcore/issues/58968#issuecomment-25904… and will be fixed soon. Links: - Github sources: github.com/codingfreak/blogsamples/tree/master/ApiConversion - MS learn for this: learn.microsoft.com/en-us/aspnet/core/fundamentals/openapi/o… What I show here in short: - Going from a new template to a full solution. - Still using Swagger as the UI. - Using OAuth2 authorization. - Build-time generation of JSON. - Linting your JSON. - Generating Operation IDs. - Generating XML-file based endpoint docs. - Problems detected with the new packages on schema generation. [00:00:00] Intro [00:01:25] Presentation [00:03:25] The new project template [00:07:28] Starting to customize [00:14:51] Apply API versionning with Swagger UI [00:28:31] OpenAPI Document Transformer: Metadata [00:34:37] OpenAPI Document Transformer: Security Schemes [00:40:05] User secrets and Swagger Auth Button back [00:45:00] OpenAPI Operation Transformer: Security Schemes with endpoint metadata [01:00:00] OpenAPI Operation Transformer: Operation Ids and spectral linting [01:12:05] VS restart because mouse pointer frozen 😒 [01:12:25] OpenAPI Operation Transformer: XML-file-based descriptions and summaries [01:23:02] A current limitation: Problems with schemas and inheritance [01:25:03] Outro