Is my JSON data uploaded to a server?

No. Everything runs entirely in your browser with JavaScript. Nothing is sent over the network, which makes the tool safe for sensitive data.

Can I minify JSON too?

Yes. Pick “min” in the Indentation option to get a compact single-line output, ideal for embedding in configs or query strings.

Does sorting keys change my data?

No. Sort keys only reorders object keys alphabetically (recursively); values, arrays and nesting are untouched. It makes diffs and comparisons much easier.

100% local — your data never leaves your browser

JSON Formatter & Beautifier — Free Online Tool

Format, beautify or minify JSON instantly in your browser, with 2 or 4 spaces and key sorting. Free and private: your data never leaves your device.

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Indentation

JSON input

JSON output

Why format JSON?

Minified or inconsistently indented JSON is painful to read and review. Paste any JSON document above to pretty-print it instantly — or minify it for production payloads.

How it works

The formatter parses your JSON locally (so syntax errors are caught and shown with their position) and re-serializes it with the indentation you pick: 2 spaces, 4 spaces or compact. Enable Sort keys to order object keys alphabetically at every level, which makes versioned files diff cleanly.

Frequently asked questions

Is my JSON data uploaded to a server?: No. Everything runs entirely in your browser with JavaScript. Nothing is sent over the network, which makes the tool safe for sensitive data.
Can I minify JSON too?: Yes. Pick “min” in the Indentation option to get a compact single-line output, ideal for embedding in configs or query strings.
Does sorting keys change my data?: No. Sort keys only reorders object keys alphabetically (recursively); values, arrays and nesting are untouched. It makes diffs and comparisons much easier.