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Format, validate, and beautify JSON right in your browser. Paste messy or minified JSON and get clean, properly indented output with syntax highlighting — plus automatic fixing of common errors like trailing commas and single quotes. Everything runs locally, so your data never leaves your device.
Paste your JSON into the editor and click Format (or press Ctrl/Cmd+Enter). It is reindented with 2-space indentation and syntax highlighting. You can switch to 4 spaces or tabs and sort keys from the toolbar.
Yes. The built-in auto-fix corrects common mistakes — trailing commas, single quotes, unquoted keys, and missing commas — and tells you what it changed.
No. All formatting and validation happen entirely in your browser. Nothing is uploaded, so it is safe for sensitive or proprietary data.