Convert OpenAPI 3.0 to Swagger 2.0

Question

Is there a generator to convert OpenAPI 3.0 to Swagger 2.0?

Mashery, an API gateway, requires Swagger 2.0 format on input to open endpoint.

Answer 1

• LucyBot api-spec-converter ( online version , GitHub repo , Node.js module ) can convert from OpenAPI 3.0 to 2.0.

• API Transformer also claims to be able to convert OpenAPI 3.0 back to OpenAPI 2.0. There's a command-line version too.

Keep in mind that OAS3→OAS2 convertion is lossy in general, because OAS3 has features that did not exist in OAS2 (such as multiple servers, oneOf / anyOf , different schemas per media type, objects in query string parameters, cookie parameters, and others).

Answer 2

I needed version 2.0 for Power Automate .
When you are building some Azure Functions than try to create them in Visual studio and any checkbox that is named Swagger nor OpenApi need to been Enabled.

Now the API of your Azure Function contains the swagger.json what you can set into Power Automate Custom Connector