Mapbox's API has something similar, except they use the first element in an array for the operator instead of an object key: https://docs.mapbox.com/mapbox-gl-j

Mapbox's API has something similar, except they use the first element in an array for the operator instead of an object key: https://docs.mapbox.com/mapbox-gl-js/style-spec/expressions/ https://docs.mapbox.com/mapbox-gl-js/style-spec/expressions/ Some will recognize that these are basically just Lisp s-expressions (as JsonLogic also seems to pretty much be) "Code as data" indeed