I wouldn't call it "novel", but I've lately turned to designing APIs first using OpenAPI [0], and then using that specification to drive routing and validation

I wouldn't call it "novel", but I've lately turned to designing APIs first using OpenAPI [0], and then using that specification to drive routing and validation using (shameless plug, but that's what I use) pyotr [1]. [0] https://swagger.io/specification/ https://swagger.io/specification/ [1] https://pyotr.readthedocs.io https://pyotr.readthedocs.io