JSON Formatter & Validator — Free Online Tool
Paste or type any JSON and instantly see it formatted with proper indentation and syntax highlighting. The validator pinpoints the exact line and column of parse errors so you can fix them fast. Minify output for production use or copy formatted JSON for readability.
100% client-side. No uploads. Your data never leaves your browser.
How to use JSON Formatter & Validator
- Paste your JSON into the input area or type it directly.
- Click 'Format' to pretty-print with 2-space indentation, or 'Minify' to compact it.
- If there are errors, the red banner shows the exact line and column of the first syntax problem.
- Click 'Copy' to copy the output to your clipboard.
Frequently Asked Questions
Does this send my JSON to a server?
No. JSON parsing runs entirely in your browser using the native JSON.parse() API. Nothing is transmitted anywhere.
What is the maximum JSON size this tool supports?
Up to 10 MB of text. Very large files may cause the browser to slow down during formatting.
Can I use this to minify JSON for production?
Yes — the minify option runs JSON.stringify() with no spacing, producing the most compact valid JSON representation.
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