OpenAPI (not Swagger; that's the old name for the spec and the current name for the toolset) has all of the above functionalities. One important component is, t

OpenAPI (not Swagger; that's the old name for the spec and the current name for the toolset) has all of the above functionalities. One important component is, to get the best benefit, it should be used for specification and not (just) documentation; in other words, you define the contract first and then base the various implementations (both server and client side) on it. Unfortunately there are not many tools that support that approach; I've tried to rectify that - for Python - with Pyotr [0]. [0] https://pyotr.readthedocs.io https://pyotr.readthedocs.io