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Free JSON Formatter & Validator Online
Free JSON Formatter & Validator Online is a free online tool by US AI. Pretty-print or minify JSON It runs completely in your browser — no signup, no download, works on mobile and desktop.
📖 How to use
- Paste JSON and press Pretty Print to format it or Minify to compress it. Invalid JSON is flagged with an error.
- Open the tool with the button above — it loads instantly.
- Your work stays on your device; nothing is uploaded anywhere.
✨ Why use this tool?
US AI's free json formatter & validator online is fast, private and 100% free forever. Bookmark this page and share it with anyone who needs it.