YAML

YAML (a recursive abbreviation denoting “YAML Ain’t Markup Language”) bills itself as a human friendly data serialization standard for all programming languages. In my experience, it’s mostly popular in the Python^ᛦ ecosystem. It’s a relatively pleasant language for fairly straightforward configuration languages (Ansible^ᛦ, in particular), though its use in tools like Cloud Custodian^ᛦ leads one to lean heavily on some of the wacky side features in the YAML spec. Pleasantly, there’s a bijection between YAML and JSON^ᛦ structures, so there’s plenty of tooling allowing a user to work in their preferred language and convert for the benefit of picky programs. All told, though, I’d much prefer everyon just use Dhall^ᛦ since it’s stricly better (if a bit less ergonomic on day one).