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JSON Formatter
Validate, beautify and minify JSON — instantly, with clear error messages and no uploads.
Your JSON
How to use the JSON Formatter
- Paste your JSON into the editor.
- Press Format to indent it or Minify to compact it.
- Fix anything the validator reports and copy the result.
Features
- Beautify with a configurable indent
- Minify to the smallest form
- Clear validation errors with line numbers
- Runs locally, no uploads
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Frequently Asked Questions
Common questions about the free online json formatter.
Paste your JSON and click Format to beautify it instantly.
Yes, it reports syntax errors with the error message.
Yes, Minify compacts your JSON into a single line.
No. Everything runs locally in your browser, so your data never leaves your device.
JSON is the standard data format for APIs and configuration.
No. It runs entirely in the browser, so nothing is uploaded to a server.
Yes, within the memory limits of your device. There is no fixed cap on the count.
Yes. Every result has a one-click copy button that puts it on your clipboard.
Yes. Everything is processed locally, so your data never leaves your device.
Last updated: October 10, 2026