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Format, validate, and pretty-print JSON data instantly. Minify or beautify with custom indentation. 100% free, processed in your browser.
Paste your JSON string into the editor or upload a .json file.
Click Format to pretty-print with indentation, or Minify to compress. Validation errors are shown instantly.
Copy the formatted result to clipboard or download as a .json file.
Yes, 100% free with no account required.
Yes. Invalid JSON is flagged with a clear error message showing the line and position of the issue.
All processing happens in your browser. No data is sent to any server.
Yes. Choose between 2 spaces, 4 spaces, or tab indentation.
No hard limit. Very large JSON files (>10 MB) may be slow to render in the browser.