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Parse YAML documents into clean, portable JSON for config checks and data exchange.
Input
0 chars
Output
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Status
Ready
Time
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This conversion runs entirely in your browser — your input never leaves your device.
YAML to JSON is a free online converter on AltFTool that parses YAML documents into clean, portable JSON for config checks and data exchange — no signup and nothing to install.
The conversion runs entirely in your browser: the YAML you paste is converted on your own device and is never uploaded to AltFTool. YAML to JSON is powered by the js-yaml library, and the JSON result can be copied or downloaded as yaml-to-json.json.
| Input format | YAML |
|---|---|
| Output format | JSON |
| Output file | yaml-to-json.json (application/json) |
| Runs | In your browser — the input is not uploaded. |
| Library | js-yaml |
| Category | Others converters on AltFTool |
Open YAML to JSON on AltFTool — the converter loads straight away, with no account.
Paste your YAML 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 JSON output with the Copy button, or download it as yaml-to-json.json.
No. YAML to JSON runs entirely in your browser using the js-yaml library, so the YAML you paste is converted on your own device and never reaches AltFTool's server.
The js-yaml library, running in your browser. The JSON you see is that library's output rather than an approximation written here.
There is no server-side limit, because nothing is uploaded — YAML to JSON converts in your browser, so the practical ceiling is your own device's memory.
The result is JSON. Copy it from the output pane in one click, or download it as yaml-to-json.json — AltFTool names the file after the converter and serves it as application/json.
Yes. YAML to JSON is free to use on AltFTool, with no account and no sign-up.
Drop the live YAML to JSON 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/yaml-to-json"
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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/yaml-to-json?utm_source=embed&utm_medium=widget" rel="nofollow">AltFTool — free online tools</a></p>More of AltFTool's Others and format tooling, and the guides around it.