Json Formatter Viewer — F

JSON Formatter & Viewer — a fast, lightweight tool for developers to format, validate, explore, transform and compare JSON data. Handles JSON files up to ~10 MB.

— Format & beautify —
✅ Format & beautify JSON with proper indentation
✅ Minify JSON to a single line
✅ Sort object keys alphabetically (recursive)
✅ Validate syntax in real-time with clear error messages
✅ Auto-format on paste or file drop

— Explore —
✅ Interactive tree viewer with expand / collapse
✅ Expand to any depth level (1–8) with one click
✅ Search with live highlight, match count, and case-sensitive mode
✅ Copy any value or path from the tree

— Undo & history —
✅ Undo the last Format, Sort Keys or Auto-format in one click
✅ Browse recent states and jump back to any of them (up to 30 entries, 5 MB total)
✅ History is remembered between sessions

— Compare —
✅ Side-by-side JSON diff view
✅ Tree-based comparison with added / removed / changed filters
✅ Toggle unchanged keys to focus on differences

— Import & export —
✅ Paste from clipboard or drag & drop files (up to ~10 MB)
✅ Load JSON from a URL
✅ Download as .json file
✅ Load a sample JSON to try it instantly

— Share —
✅ One-click share link (data lives in the URL, never hits any server)

— UX —
✅ Dark & light theme with preference remembered
✅ Editor and viewer state persisted between sessions
✅ No ads, no tracking, no data collection — everything runs in your browser

Simply click the extension icon, paste your JSON, and format it instantly.

Also available as a web app at https://json.fedrr.com