I think succint is the word I want. Nested validation logic that looks like the object you are validating. Unfortunately Play docs are not succint, but you may

I think succint is the word I want. Nested validation logic that looks like the object you are validating. Unfortunately Play docs are not succint, but you may get the idea from here: https://www.playframework.com/documentation/2.3.x/ScalaJsonCombinators https://www.playframework.com/documentation/2.3.x/ScalaJsonC... I tried to implement similar (typesafe) myself using TypeScript: https://github.com/Ciantic/model-validation https://github.com/Ciantic/model-validation there are certain problems I hit with TypeScript, and also I don't want my backend to be JavaScript so I've stopped working on it.