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Convert JSON objects into clean, human-readable YAML for configs, docs, and data files.
Input
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Output
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This conversion runs entirely in your browser — your input never leaves your device.
JSON to YAML is a free online converter on AltFTool that converts JSON objects into clean, human-readable YAML for configs, docs, and data files — no signup and nothing to install.
The conversion runs entirely in your browser: the JSON you paste is converted on your own device and is never uploaded to AltFTool. JSON to YAML is powered by the js-yaml library, and the YAML result can be copied or downloaded as json-to-yaml.yaml.
The shape of the output is inferred from the JSON sample you paste, so the keys, types and nesting in your input decide the keys, types and nesting you get back.
| Input format | JSON |
|---|---|
| Output format | YAML |
| Output file | json-to-yaml.yaml (text/plain) |
| Runs | In your browser — the input is not uploaded. |
| Library | js-yaml |
| Category | JSON converters on AltFTool |
Open JSON to YAML on AltFTool — the converter loads straight away, with no account.
Paste your JSON into the left-hand input pane, or press Sample to load a working example.
The conversion runs automatically about 300ms after you stop typing — there is no Convert button, and nothing is uploaded while it works.
If this converter exposes options, open Settings to change them — the output re-runs as you adjust.
Copy the YAML output with the Copy button, or download it as json-to-yaml.yaml.
No. JSON to YAML runs entirely in your browser using the js-yaml library, so the JSON you paste is converted on your own device and never reaches AltFTool's server.
The js-yaml library, running in your browser. The YAML you see is that library's output rather than an approximation written here.
There is no server-side limit, because nothing is uploaded — JSON to YAML converts in your browser, so the practical ceiling is your own device's memory.
The result is YAML. Copy it from the output pane in one click, or download it as json-to-yaml.yaml — AltFTool names the file after the converter and serves it as text/plain.
Yes. JSON to YAML is free to use on AltFTool, with no account and no sign-up.
Drop the live JSON to YAML workspace into your own docs page, tutorial or blog post with one snippet. Free, responsive, light and dark — just keep the “Widget by AltFTool” credit link visible.
<iframe src="https://www.altftool.com/embed/widget/transform/json-to-yaml"
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width="100%" height="820" style="border:0;border-radius:12px;overflow:hidden"
loading="lazy" referrerpolicy="no-referrer-when-downgrade" allow="clipboard-write"></iframe>
<p style="font-size:12px;margin:4px 0 0">Widget by <a href="https://www.altftool.com/transform/json-to-yaml?utm_source=embed&utm_medium=widget" rel="nofollow">AltFTool — free online tools</a></p>More of AltFTool's JSON and format tooling, and the guides around it.