Private developer converter

Convert JSON to YAML without uploading your data

Switch between two explicit directions, preserve exact JSON number text and reject ambiguous YAML structures instead of silently changing their meaning.

Open JSONYAML

No account · no upload · no history · no result URL

Three explicit steps

Choose, convert, verify

Choose the direction

Paste one JSON or YAML document or open a local text file.

Convert the compatible tree

Strict rules reject duplicates and YAML-specific ambiguity.

Review before use

Diff the output and parse it with the destination tool.

For ordinary developer data

Useful where syntax changes but data should not

Prepare a readable YAML copy of a sample JSON API payload.
Turn a simple YAML fixture into JSON for tests or documentation.
Expose anchors, tags or duplicate keys before a lossy handoff.

Reproducible examples

Reproducible JSON and YAML examples

Use non-secret fixtures when possible, keep the original and verify the complete result before relying on it.

View examples

Private by construction

Convert the document in this browser

Use non-secret fixtures when possible, keep the original and verify the complete result before relying on it.

Open JSONYAML