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Was not expecting Swagger... neat!

Don't they call it OpenAPI now?

yes

Depends on the version :P

Swagger has been retrospectively renamed OpenAPI 2.0

I think now "OpenAPI" is the schema definition, swagger is the tool you actually use to display your OpenAPI specs in a nice interactive GUI.

Not quite - Swagger has been retrospectively renamed OpenAPI 2.0. Swagger UI is the tool we're seeing here