JSON Formatter & Validator
Free online JSON formatter, 100% private, runs in browser
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JSON Formatter & Validator - Free online JSON formatter, 100% private, runs in browser

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jsontool.io is a free online JSON formatter, validator and minifier. Paste your JSON and get it instantly beautified with syntax highlighting. No data sent to any server – everything runs locally in your browser.

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Hey Product Hunt! 👋 I built jsontool.io because I was tired of JSON formatters that send your data to their servers. jsontool.io runs 100% in your browser – your JSON never leaves your device. It's fast, free, and works even offline once loaded. Features: ✅ Format & Beautify JSON ✅ Validate with error detection ✅ Minify JSON ✅ Syntax highlighting ✅ Copy & Download ✅ 2 or 4 space indentation ✅ 100% client-side – no data sent anywhere Would love your feedback on what features to add next!