JSONaut — Local JSON Tree Viewer

Paste JSON and view it as a formatted, collapsible tree with search. 100% local — nothing leaves your browser.

JSONaut is a fast, completely local JSON viewer. Click the toolbar icon, paste your JSON, and explore it as a clean, collapsible tree. Unlike many JSON tools, JSONaut requests ZERO permissions and has no servers — the JSON you paste never leaves your device. FEATURES • Formatted, collapsible tree view — expand and collapse nested objects and arrays • Raw view with syntax highlighting, plus one-click Beautify and Minify • Search across keys and values, with jump-to-next / previous • Light and dark themes • Copy formatted JSON PRIVATE BY DESIGN Everything happens inside your browser. JSONaut requests no permissions at all, has no servers, and sends nothing anywhere. The JSON you paste never leaves your device. No tracking, no analytics, no remote code. Great for developers, API work, and anyone who needs to make sense of a blob of JSON fast.