Note: This question is different from the one here, in that I need it to work with Swagger. Given a FastAPI GET endpoint, I want to allow any arbitrary set of URL parameters, while maintaining Swagger support. My use case is that I want to support a JSON API-like set of query parameters such as this: /api/books/?include=author&sort=name,zip&sort[author]=-lname&fields=name,phone,street The use of square brackets prevents me from using traditional classes to model query parameters, so I'm directly using the Request object instead. However, I would like to use Swagger to test the endpoint. I can't find a way to provide arbitrary URL parameters. I'm happy to type them in as a single string. One would think something like the following: def books(**params): .... That gives a curl statement of: api/books?params=sort%5Bone%5D%3Dtwo' What I really want is: api/books?sort&one%5D%3Dtwo' Continue reading...