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Another potential option, is Lightbend Config

It adds includes/inheritance, substitutions, unit of measure parity , comments , and few other things -- on top of JSON.

does not have if-logic, loops, or arbitrary functions, however.

On plus side, the library is available in a number of languages, easily embeddable. And there is an IntelliJ plugin for it, to color the syntax of the config files.

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HOCON is a very nice configuration format that should be preferred to JSON and YAML - it really deserves more adoption. I always reach for Lightbend Config on non-Spring projects.

It has a pretty nice format, but I've run into it's limitations more than once. Array indexing is not possible in the config or library, and nested-environmental variable substitution is not possible (e.g. $ACCESS_KEY_{$ENV_NAME})

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