Is my JSON sent to a server?

No. Formatting and validation run entirely in your browser, so you can paste sensitive data safely.

Does it validate too?

Yes — invalid JSON shows a clear error message instead of output.

Yes. Choose 'Minify' to strip all whitespace into a single compact line.

JSON Formatter

Format, validate and minify JSON.

100% in your browser — nothing uploaded

Indent

About this tool

Pretty-print, validate and minify JSON with clear error messages. Runs entirely in your browser — paste sensitive payloads without them leaving your device.

Files are processed on your device — nothing is uploaded.
No account, no watermark, no daily limits.
Works offline once the page has loaded.

Frequently asked questions

Is my JSON sent to a server?: No. Formatting and validation run entirely in your browser, so you can paste sensitive data safely.
Does it validate too?: Yes — invalid JSON shows a clear error message instead of output.
Can it minify?: Yes. Choose 'Minify' to strip all whitespace into a single compact line.

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