JSON to YAML Converter
Paste JSON and get readable YAML with the structure preserved. Prettify parses the JSON locally, then emits YAML with two-space indentation and no surprise line wrapping, ready to copy or download. It is the quick way to turn an API payload into a config file.
How structure is preserved
Objects become YAML mappings and arrays become sequences, with nesting expressed through indentation rather than braces and brackets. Keys and strings are quoted only when quoting is actually required, which keeps the output clean and human-friendly instead of over-escaped.
Long string values are emitted on a single line rather than being wrapped at an arbitrary column, so a URL or a base64 blob stays intact and copy-pasteable.
From API payload to config file
YAML is the lingua franca of configuration, so converting a JSON response or fixture into YAML is often the first step to dropping it into a Kubernetes manifest, a GitHub Actions workflow, or an app config. Doing it here means you can shape the JSON first, then convert, without switching tools.
The YAML output opens in the editor, so you can eyeball it, tweak a value, and validate it before it goes anywhere.
Precision and privacy
While your data stays as JSON, numbers beyond JavaScript's safe range are preserved exactly. Converting to YAML coerces those numbers to native values, and Prettify warns when that could cost precision, so you are never surprised by a silently rounded ID. The whole conversion runs in your browser.
Frequently asked questions
Is the JSON to YAML converter free?
Yes. Converting JSON to YAML and previewing the result costs nothing and needs no account. Pro features like queries and diff are unrelated to converting between these two formats.
Does my JSON get uploaded to convert it?
No. The conversion is done locally in the browser, so your payload stays on your device rather than being sent to a server.
Will long strings get wrapped or broken?
No. Line wrapping is disabled, so long values such as URLs or tokens are written on a single line and remain intact when you copy them.
What happens to very large numbers?
While the data is JSON they are preserved exactly, but converting to YAML coerces them to native numbers. Prettify shows a warning when that conversion could lose precision.
Can I convert the YAML back to JSON?
Yes. The reverse direction is a single click, so round-tripping between JSON and YAML while you iterate is easy.