Scalar vs Swashbuckle vs NSwag in ASP.NET Core: Which OpenAPI Tool Should Your .NET Team Use in 2026?

If you have been building ASP.NET Core APIs for any length of time, you have almost certainly used Swashbuckle to generate Swagger UI. For years it was the default — bundled right into the dotnet new webapi template. Then .NET 9 dropped it. Microsoft...