yamlfmt
An extensible command line tool or library to format yaml files
...It focuses on practical concerns unique to YAML—multi-document streams, anchors and aliases, comments, and block scalars—so a reformat doesn’t destroy semantics or helpful annotations. The tool ships as a single, distributable binary and can also be used as a library, making it simple to drop into CI and editor workflows. Configuration is file-based, allowing teams to pin indentation, line wrapping, and other house-style choices repo-wide. By normalizing structure while preserving meaning, it reduces diff noise and merge friction in configs, Kubernetes manifests, and automation playbooks. ...