JSON ↔ YAML Converter
Convert JSON to YAML and YAML back to JSON in either direction.
About JSON ↔ YAML Converter
The JSON ↔ YAML Converter translates between the two formats in either direction. YAML is everywhere in modern testing work — CI pipelines, Kubernetes manifests, OpenAPI specs, docker-compose files — while APIs and fixtures speak JSON, so converting between them is a near-daily task.
Paste JSON to get clean, two-space-indented YAML, or paste YAML to get formatted JSON. Conversion runs live in your browser as you type, and either side doubles as a validator: a syntax error in the input is reported immediately instead of producing a silently wrong document.
How to use
- Pick the conversion under "Direction" — JSON → YAML or YAML → JSON.
- Paste your document into the input box; the converted result appears immediately on the right.
- If the input has a syntax error, read the message below the boxes and fix it — the output refreshes as you type.
- Copy the result, or use "Load sample" to see a small example converted.
Frequently asked questions
Is the conversion lossless?
JSON → YAML is always lossless — every JSON document is valid YAML data. YAML → JSON is lossless for the values, but YAML-only features such as comments and anchors are resolved or dropped, because JSON has no way to represent them.
Why did my unquoted YAML value come out as a different type?
YAML infers types from bare scalars: no, off and 3.0 become false, false and 3. If you need the literal string, quote it in the YAML — this is the classic "Norway problem" and a real source of config bugs worth testing for.
Is my document uploaded anywhere?
No. The converter runs entirely in your browser, so internal pipeline configs and API payloads never leave your machine.