JSON Formatter & Viewer

Format, view and compare JSON, decode JWTs and Base64 and encode URLs in a side panel. Works offline; nothing is uploaded.

JSON Formatter & Viewer opens in Chrome's side panel next to the page you are working on. Paste JSON to pretty-print it with 2 spaces, 4 spaces or tabs, minify it, sort keys, browse it in a tree view, or download it as a .json file. When JSON is broken, the formatter shows the line and column of the error with a pointer to it, and Repair and format fixes common problems such as comments, trailing commas, single quotes and bare keys. JSON diff compares two documents by meaning and lists every added, removed and changed path, with a side-by-side view. Private. Runs in your browser. Nothing uploaded. The extension has no host permissions, and its content security policy blocks all network connections (connect-src 'none'), so what you paste stays on your device. Select text on any page and right-click to send it to a tool. Bundled tools - JSON formatter - JSON diff - Base64 encode and decode - URL encode and decode - JWT decoder