JSON Formatter & Validator — Free
Format, validate, and minify JSON. Detects syntax errors and shows exact position. 100% private — nothing leaves your browser.
Input
Output
Format & validate
Pretty-print with 2 or 4 spaces. Syntax errors shown with exact message.
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Minify for production
Remove all whitespace and line breaks. See the exact byte reduction percentage.
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Fully private
JSON.parse and JSON.stringify run in your browser. No data ever leaves your device.