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YAML validator

Check YAML structure, nesting and safe-subset compatibility locally.

YAML check84 characters
Paste configuration text. The live preview stays inert and is limited for responsiveness.
Live validationReady
Valid supported YAML
7 values · 2 levels deep · object root
Processed on your device

How it works & useful details

What validation covers

This is a structural check for the same safe YAML data subset used by the converter: two-space maps/lists, comments, quoted/plain scalars, booleans, null and finite safe numbers. It reports the first clear line-level issue it finds.

It is not a complete YAML implementation or a deployment/security certificate. Unsupported advanced YAML is reported explicitly instead of being reinterpreted.

Private, bounded processing

This workspace parses text only in your browser. It never opens links, requests external entities, runs pasted configuration, or saves your document. Input is limited to 500,000 characters; conversion output is limited to 1,000,000 characters.