DevJSON — Local JSON Viewer & Toolkit

About

Open any JSON in your browser and DevJSON turns it into a clean, interactive view — instantly. Built for developers who live in APIs, and built to be 100% local, with no network calls and no tracking.

Most "JSON viewer" extensions are a privacy minefield — several have shipped ads or trackers. DevJSON does the opposite: everything happens in your browser, nothing is ever sent anywhere.

FEATURES
• Automatic, beautiful tree view for any application/json page
• Search, collapse/expand, and one-click copy
• JSON diff — compare two payloads and see what changed (Pro)
• JWT decode — inspect header & payload locally (Pro)
• JSONPath queries — pull values out of big objects fast (Pro)
• Format / minify scratchpad for pasting JSON
• Light & dark themes

PRIVACY FIRST
100% local. No network requests, no analytics, no tracking — your data never leaves the browser.

FREE & PRO
Free includes the tree viewer, search, and format/minify. Pro unlocks diff, JWT decode, JSONPath, and saved snippets.

Built by ForgeWorks.