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Frequently asked questions
What YAML features are supported?
The common subset: nested maps and lists, scalars (strings, numbers, booleans, null), quoted keys, comments, and inline flow collections like [1, 2] and {a: b}. Anchors, aliases and multi-document streams aren't parsed by this lightweight converter.
Is my data uploaded?
No. Parsing and conversion run entirely in your browser with JavaScript. Your YAML or JSON never leaves the page.
Why did my YAML fail to parse?
YAML is indentation-sensitive — mixing tabs and spaces or misaligning a nested block is the usual cause. The tool converts tabs to spaces and reports where the structure breaks.
Can I convert JSON back to YAML?
Yes. Switch the action to 'JSON → YAML' and paste JSON; the tool emits clean, indented YAML that round-trips back to the same structure.
About this YAML tool
- Converts YAML to JSON and JSON to YAML, and validates YAML structure — all in your browser, nothing uploaded.
- It supports the common YAML you meet day to day: nested maps, lists, scalars (strings, numbers, booleans, null), quoted keys and inline
[a, b]/{k: v}collections. - Very advanced YAML features (anchors & aliases, multi-document streams, complex block-scalar folding) are outside this lightweight parser — for those, validate against your target system too.
- YAML is indentation-sensitive, so the tool reports the point where structure breaks if parsing fails.