JSON to YAML & YAML to JSON Converter

Three reasons, all about humans rather than machines. YAML supports comments, so you can explain why a value is what it is — the single most requested JSON feature that will never exist. Indentation instead of punctuation means fewer bracket-matching errors in long files and cleaner Git diffs, because adding a key touches one line rather than also editing the previous line’s comma. And multi-line strings can be written literally with |, which matters for embedded scripts and certificates.

YAML is more permissive, so the risk lives in the YAML → JSON direction and in hand-editing afterwards. Unquoted yes, no, on, and off are read as booleans by YAML 1.1 parsers — the classic bug where a country code NO becomes false. Version strings like 1.10 become the number 1.1, losing the trailing zero. Tabs are not valid indentation. Quote any value whose type you care about, and the round trip stays faithful.

JSON → YAML is lossless, because YAML can express everything JSON can. YAML → JSON is lossy in one direction that matters: comments are discarded, since JSON has nowhere to put them. YAML anchors and aliases are expanded into duplicated values, and features with no JSON equivalent — multiple documents in one stream, explicit type tags — do not survive. Keep the YAML as your source of truth and treat the JSON as generated output.