HushJSON: JSON Formatter

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