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★★★★★
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Where this app stands in South Africa, updated 7 Nov 2026
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Big stability and data-safety update. The app is now called HushJSON: JSON Formatter — same tool, same privacy: everything stays on your device. DATA SAFETY • Fixed two bugs that could silently lose saved history: top-level JSON strings (like "hello") no longer get corrupted when saved and reloaded, and a full storage no longer wipes your history — you now get a clear warning instead • Saved entries are deduplicated, and deleting or selecting them works reliably RELIABILITY • Files exported from Windows tools (with a byte-order mark) now parse instead of being rejected • The error view no longer gets stuck: fix your JSON and the formatted result comes right back, and error hints now follow your app language • Dragging in files with an uppercase .JSON extension now works • Clearing the editor before saving no longer overwrites the history entry you had loaded • Diff no longer shows phantom changes or blank rows for keys like "toString" SMOOTHER & MORE ACCESSIBLE • Faster rendering of large JSON documents • Pinch-to-zoom works again on iPhone and iPad • Cleaner, distraction-free empty output panel • Better fit for foldable iPhones and the latest iOS; now requires iOS 15 or later SECURITY • Hardened app isolation and dependency supply chain • Privacy policy now available in-app and on the web Thank you for using HushJSON — it stays free, open source, and 100% local.
HushJSON is a fast, private JSON toolkit that runs entirely on your device. Format, minify, validate, escape, repair and diff JSON — with no uploads, no accounts and no tracking. ALL PROCESSING STAYS LOCAL No backend, no data collection, no sign-in. Everything you paste or open stays on your device, and the app works fully offline. Inspect API responses, config files, JWTs and log payloads — even the sensitive ones — with peace of mind. EVERYTHING YOU NEED • Format — 2-space indentation, syntax highlighting • Interactive tree — expand and collapse any object or array • Minify — compact single-line output • Validate — live red / green feedback with precise error messages • Auto-repair — completes missing brackets, fixes unquoted keys • Escape / unescape — JSON string escaping • Diff — structured recursive comparison by key, not by line; added, removed and changed values highlighted side by side • List & detail — arrays open in a split view with item previews • History — save results locally, reload instantly, pick two entries to compare • Drag & drop and file open — load .json files in one step • External keyboard — Cmd+Enter to format, Cmd+S to save, Cmd+D to download DESIGNED FOR REAL WORK Dark and light themes, line numbers, scroll sync, output search, and a mobile-first layout that works one-handed on iPhone and takes full advantage of iPad. 5 LANGUAGES English, 中文, Español, Deutsch, 日本語 — switch any time in the app. FREE & OPEN SOURCE HushJSON is MIT-licensed open source. The web version (installable as an offline PWA) and desktop builds for macOS, Windows and Linux are on GitHub. Privacy policy: https://sky-jiangcheng.github.io/hush-json/privacy.html