JSON Editor & Validator
Edit, format, validate and minify JSON online for free, with a collapsible tree view and instant error locations. Runs 100% in your browser — your data never leaves your device.
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Frequently asked questions
Is this JSON formatter and validator free?
Yes, completely free with no limits, accounts or watermarks. Everything runs on your own device, so there is nothing to charge for.
How does JSON validation work?
Invalid JSON is flagged live as you type, and the Validate button jumps straight to the exact line and column of the first error. Valid documents can be formatted, minified or key-sorted in one click.
Is my JSON uploaded to a server?
No. The editor runs entirely in your browser. Your data never leaves your device — you can even disconnect from the internet once the page has loaded.
Can I convert JSON to CSV or Excel?
Yes. Use the JSON to CSV converter for spreadsheets, or open the file in the Data Table Editor to view, edit and export it as CSV, Excel or SQLite.