Can Swashbuckle generate OpenAPI 3.0?

Question

Using Swashbuckle in ASP.NET core 2.2 generates Swagger specification version 2, but now a change to version 3 specification is required (OpenAPI 3.0)

Where should a code specification be added to make it happen? And, is this supported?

Answer 1

EDIT

Now the Version 5 is out of prerelease it is no longer mandatory to install the 5.0.0 release candidate version of Swashbuckle. Simply running

Install-Package Swashbuckle.AspNetCore

Will be enough to ensure you are using the latest version of Swashbuckle with OpenApi 3.0 support.

Previous Answer

Version 5 of Swashbuckle supports OpenApi 3.0. This is currently in prerelease at the moment, but you can obtain it from the nuget package https://www.nuget.org/packages/Swashbuckle.AspNetCore/5.0.0-rc2

Just run the following command in your package manager console

Install-Package Swashbuckle.AspNetCore -Version 5.0.0-rc2