JSON Formatter & Viewer — Fast, Clean, No Ads

Format, validate, minify, sort & compare JSON. Tree viewer, search, history, files up to ~10MB. No ads, no tracking, free.

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