I'd say TOML [0] is the best because it can be a very simple key=value structure, but also supports very detailed, nested structures. It has a 1-to-1 correspond

I'd say TOML [0] is the best because it can be a very simple key=value structure, but also supports very detailed, nested structures. It has a 1-to-1 correspondence with JSON, but is more friendly for configuration (comments are a huge help!) [0]: https://github.com/toml-lang/toml https://github.com/toml-lang/toml