JSON Keeper

View, format and copy JSON — with an obvious paste box, one-click valid-JSON copy, and big integers that never lose precision.

JSON Keeper turns any JSON — a URL, a local file, or text you paste — into a clean, collapsible, syntax-highlighted view, and gives you back exactly the JSON you started with. WHY IT'S DIFFERENT • Big integers stay exact. Most viewers run JSON through the browser's number parser, silently rounding large IDs (e.g. 136986234663732436 → ...430). JSON Keeper preserves every digit — in the tree and when you copy. • Copy is a first-class, visible button. Get valid, properly-quoted JSON in one click — plus per-node "copy value", "copy subtree" and "copy path" (like customer.email) on hover. • An obvious entry point. Click the icon and paste — or just open any .json URL and it formats automatically. FEATURES • Collapsible tree with line numbers, node counts, and a structure outline to jump around large documents • Fast search with match count, next/previous, and auto-expand of matches • Pretty / Raw (exact source) / Minified views; download as .json • Light / dark / auto theme, remembered • Handles real-world quirks: strips XSSI guard prefixes ()]}') and unwraps JSONP (callback({...})) • Large files stay responsive (the tree is built on demand) PRIVACY No accounts, no tracking, no ads, no telemetry. JSON Keeper makes no network requests — everything runs locally. Your settings are stored on your device only. See the privacy policy linked below. NOTES • To view local files (file://), enable "Allow access to file URLs" for JSON Keeper in chrome://extensions. • Chrome only.