Cue, an open-source data validation language

CUE is an open-source data validation language and inference engine with its roots in logic programming. CUE's design ensures that combining CUE values in any order always gives the same result. On the right one sees a mix between data and schema as is exemplary of CUE. Schema municipality. CUE's constraints act as data validators, but also double as a mechanism to reduce boilerplate. The data can even be generated in CUE's scripting layer and automatically injected in a configuration pipeline. CUE can define schema to validate otherwise typeless data files. Medium scale As soon the desire arises to reduce boilerplate, the cue tool can help to automatically rewrite configurations.