Private JSON tool
JSON to YAML Converter
Convert valid JSON into YAML text in your browser. The conversion runs locally, with no upload and no account.
About browser JSON to YAML conversion
This tool parses JSON text locally and writes YAML from the parsed value. Pasted text and opened files stay in the browser.
It is useful for moving structured data into configuration-style YAML while preserving arrays, objects, strings, numbers, booleans, and null values.
Does this upload my files?
No. Everything on this page runs locally in your browser, so your files are never uploaded to a conversion server. Close the tab and nothing is left behind.
After any required processing engine has loaded, repeated conversions can keep working offline. You can verify the claim with the site's reproducible browser privacy audit.
FAQ
Is my JSON uploaded?
No. JSON parsing and YAML output are handled locally in the browser tab.
Which YAML library does this use?
The page uses the YAML parser and stringifier bundled with this site build.
Can I convert arrays and nested objects?
Yes. Valid JSON values, including arrays and nested objects, can be converted to YAML.
Does it validate JSON first?
Yes. Invalid JSON stops the conversion and shows a readable parse error on the page.