JSON ⇄ YAML Converter
Paste JSON or YAML — get the other one back. Auto-detects direction. Runs entirely in your browser, no upload, no sign-up.
Convert JSON ⇄ YAML in your browser
Paste JSON or YAML and get the other format back instantly. Everything runs locally in your browser — your data is never uploaded to a server.
How it works
- Direction = auto (default) — input that starts with
{or[is treated as JSON and converted to YAML; anything else is treated as YAML and converted to JSON. Force it withjson-to-yamloryaml-to-json. - Pretty-print — indent the JSON output (only applies to YAML → JSON).
- Conversions are value-preserving: JSON → YAML → JSON round-trips back to the same data.
Notes
- YAML is a superset of JSON, so valid JSON is also valid YAML.
- Great for turning API responses into readable config, or config files into JSON for tooling.
FAQ
How does auto-detection pick the conversion direction?
It looks at the first non-whitespace character of your input: { or [ means the
text is treated as JSON and converted to YAML; anything else is parsed as YAML and
converted to JSON. If that guess is wrong for your input, set the direction
explicitly to json-to-yaml or yaml-to-json (the short aliases j2y, y2j,
json2yaml, and yaml2json also work).
Will comments and anchors in my YAML survive the conversion?
No. The converter parses your document into plain data values, so # comments are
dropped and &anchor/*alias references are expanded into their literal values in
the JSON output. The data round-trips exactly; the YAML-only syntax does not.
Why doesn't Pretty-print change my YAML output?
The pretty option only applies in the YAML → JSON direction, where it switches the JSON output from a single compact line to indented multi-line form. YAML output is always written in standard block style, which is already readable.
Can I convert a multi-document YAML file (separated by ---)?
Not in one pass — the parser accepts a single document, so a stream of ---
separated documents is rejected as invalid. Split the stream and convert each
document on its own.
Developer & Automation Access
Run it from the terminal
Same engine as this page, headless — via the gizza CLI:
gizza tool json-yaml-converter '{ "name": "Ada" } or name: Ada'New to the CLI? Get gizza →
Open it by URL
Pre-fill and auto-run this tool with query parameters — the names match the API/CLI:
https://gizza.ai/tools/json-yaml-converter/?input=%7B%20%22name%22%3A%20%22Ada%22%20%7D%20%20%20or%20%20%20name%3A%20Ada&direction=auto&pretty=trueMachine-readable descriptor: tool.json — title + parameters JSON Schema for agents.