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JSON to TOML Converter

Free online JSON to TOML converter — turn a JSON object into TOML config in your browser. Runs locally, nothing uploaded.

Learn more: JSON, YAML, XML & TOML: Data Formats ComparedThe strengths, pitfalls and best uses of JSON, YAML, XML and TOML — and what gets lost when converting.

JSON

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TOML

Runs entirely in your browser — nothing you enter is uploaded or stored.

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JSON to TOML Converter

Free online JSON to TOML converter — turn a JSON object into TOML config in your browser. Runs locally, nothing uploaded.

Paste your JSON on the left and the TOML is produced instantly on the right — right in your browser. There’s no upload step: your data never leaves the page, which you can confirm from the Network panel or our privacy policy.

Credits

This tool is powered by open-source libraries that run in your browser:

smol-toml — TOML parser/serializer (BSD-3)

Frequently asked questions

How do I convert JSON to TOML?

Paste or type your JSON in the left editor (or use Sample / Upload / URL). The TOML appears instantly on the right — copy or download it. Everything runs in your browser.

Is my data uploaded anywhere?

No. This converter runs entirely in your browser — your JSON is never sent to a server. You can verify it in the Network tab or in our Content-Security-Policy.

Is the JSON to TOML free?

Yes — completely free, no sign-up and no limits. Everything happens client-side.

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