JSON Formatter & Viewer - Pretty Print, Validate, Search

JSON formatter that pretty prints any JSON page as a searchable tree, with copy path and errors marked by line. No ads, no tracking.

JSON formatter that turns a raw response into a collapsible tree the moment it loads: item counts on every object and links you can click. Open an API URL and the tree is already there. Press / to search keys and values. Hover a row for its path and click to put it on your clipboard. Invalid input gets a line and column. Big numbers are never rounded, and large documents load without freezing the tab. It is made for developers who read API output. 🌳 Any API URL becomes a searchable tree with a breadcrumb and copy path 🔒 No ads and no tracking. Nothing leaves your browser 🆓 Free with no account, plus a viewer of its own to paste or open a file What you get: --------------------- ✅ Formats any JSON content type as well as plain text that parses, JSONP callbacks included ✅ Switch between the tree, a pretty-printed view and the raw bytes as sent. Browser find works in every view, on everything that is unfolded ✅ Search with a match count and a filter that keeps only the matching rows. Match case or use a regular expression ✅ A breadcrumb of the current path, copied in the style you choose, JSONPath included ✅ Copy the whole document pretty-printed or minified, or download it as a file. Copy any single value on its own ✅ Numbers and key order exactly as sent, so a copied value or document is always valid JSON ✅ Large documents load in stages and parse in small slices, so the tab stays responsive ✅ Keyboard first: the bracket keys fold or open everything and / starts a search. One letter switches the view ✅ Dark mode and the indent width in the toolbar menu, and formatting off for one site or back on from the extension's own page ✅ The viewer page makes anything on your clipboard or disk easy to read: paste it or pick a file Privacy: --------------------- 🚫 No network requests and no remote code 🚫 No analytics and no account. The text stays in the tab that loaded it until you copy or download 🚫 Permissions: storage for settings on this device, and site access with scripting so the detector can check every page it loads Good to know: --------------------- Very large documents wait for your click: "Format anyway" or "Show raw". Local files format on their own once you allow access to file URLs for this extension in chrome://extensions. The viewer opens them either way. The extension formats top-level documents only, never frames. Feedback and bugs: --------------------- A document that should format but does not? Send its address and your browser version through the Support link. Latest changes: --------------------- 1.0.0, September 2026: first release