JSON Formatter Next

Manifest V3 Chrome extension that formats JSON pages with syntax highlighting, collapsible tree, search, copy, download, and diff.

JSON Formatter Next is a modern Manifest V3 Chrome extension that turns unreadable JSON responses into a clean, interactive tree right in your browser. Built for the latest Chrome extension platform, it automatically detects JSON pages — API responses, .json files, and other documents — and replaces raw text with a neatly formatted view with syntax highlighting. Features: • Auto-formatting — the extension detects JSON on the page and displays it in a readable tree. Toggle it on or off with one click from the popup. • Syntax highlighting — keys, strings, numbers, booleans, and null are color-coded so you can scan data faster. • Collapsible tree — expand and collapse objects and arrays node by node. Item counts are shown for each branch. • Toolbar — expand all, collapse all, copy to clipboard, download as a file, or switch back to the raw view. • Search — find keys and values across the entire document with match highlighting. • JSON Diff — a dedicated tool to compare two JSON documents and see what was added, removed, or changed. • Themes — light, dark, or system. Your preference syncs across the formatter, popup, and options page. • Options page — manage auto-formatting and other settings in one place. Why you'll like it: • Built on Manifest V3 — uses the current Chrome extension standard with improved security, privacy, and long-term support. Manifest V2 is deprecated and no longer accepted in the Chrome Web Store. • Saves time when working with APIs, logs, configs, and any JSON data — no need to copy responses into external editors. • Does not break page layout — the formatter runs in an isolated Shadow DOM container and does not affect the host page's styles. • Great for debugging — quickly find fields, collapse noisy branches, and compare JSON versions side by side. • Lightweight and fast — formatting happens locally in your browser, with no data sent to a server. • Built for developers, QA engineers, analysts, and anyone who opens JSON in the browser regularly. Install JSON Formatter Next — a Manifest V3 extension — and work with JSON as comfortably as you would in your IDE.