Developer

JSON formatter

Prettify, validate, and minify JSON. Highlights syntax errors in real time.

100% private. All processing happens locally in your browser — no files or data are ever sent to a server.

How to use JSON formatter

01 Paste or type your input into the text field provided
02 The output generates instantly as you type
03 Click Copy to send the result straight to your clipboard

Frequently asked questions

Common questions about JSON formatter.

Is JSON formatter free to use?

Yes, JSON formatter is completely free. No account, subscription, or payment is ever required — just open the page and start using it.

Does JSON formatter upload my data to a server?

No. JSON formatter runs entirely in your web browser using client-side JavaScript. Your files, text, and data never leave your device, making it 100% private.

Can I use JSON formatter on my phone or tablet?

Yes. JSON formatter is fully responsive and works on all modern smartphones, tablets, and desktop browsers without installing any app.

Does JSON formatter work without an internet connection?

Yes. Once the page has loaded, JSON formatter works fully offline — all processing is done locally in your browser.

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About JSON formatter

The JSON Formatter prettifies minified or unformatted JSON into an indented, human-readable structure with syntax highlighting for keys, strings, numbers, booleans, and null values. It validates JSON in real time, highlighting any syntax errors and displaying their position so you can fix them immediately. A minify function collapses formatted JSON back into a single-line string for use in API payloads, config files, and environments where whitespace is overhead. All processing happens locally — no JSON data is ever transmitted.