Free Tool · No API · 100% Private

JSON Formatter & Validator

Paste your messy, minified, or broken JSON. We will format it, validate it, and highlight any syntax errors instantly in your browser.

🔒 100% Private ✨ Instant Formatting 🚨 Error Highlighting 📋 1-Click Copy

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100% Private

All JSON formatting happens locally in your browser. We never log or send your data to any servers.

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Instant Validation

Quickly catch syntax errors, missing trailing commas, and unquoted keys. Validates JSON directly on formatting.

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Customizable Output

Choose your indentation preference: 2 spaces, 3 spaces, 4 spaces, or Tabs. Or completely minify it!