How does YAML Diff work?

Both YAML inputs are parsed into JavaScript objects using a built-in YAML parser. The objects are then flattened into dot-notation key paths and compared. Added, removed, and changed keys are shown with their old and new values.

Does it handle YAML anchors and aliases?

Basic anchors and aliases are resolved during parsing. Complex YAML features like merge keys (<<) are also supported. If a feature is not recognized, the parser will surface an error.

What if my YAML is invalid?

Each panel independently validates its YAML. If either input has a syntax error, a parse error is shown next to that panel and the comparison is paused until both inputs are valid.

YAML Diff

Compare two YAML documents and show key-path differences with old and new values.

YAML A (original)

YAML B (changed)

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FAQ

How does YAML Diff work?: Both YAML inputs are parsed into JavaScript objects using a built-in YAML parser. The objects are then flattened into dot-notation key paths and compared. Added, removed, and changed keys are shown with their old and new values.
Does it handle YAML anchors and aliases?: Basic anchors and aliases are resolved during parsing. Complex YAML features like merge keys (<<) are also supported. If a feature is not recognized, the parser will surface an error.
What if my YAML is invalid?: Each panel independently validates its YAML. If either input has a syntax error, a parse error is shown next to that panel and the comparison is paused until both inputs are valid.

YAML Diff converts both inputs to JSON internally, then performs a deep recursive comparison. Differences are shown as dot-notation key paths alongside the old value and new value. Useful for comparing Kubernetes manifests, Helm values files, CI configuration, or any YAML-based configuration drift. All processing happens in your browser.