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JSON Formatter - Viewer & Beautifier icon

JSON Formatter - Viewer & Beautifier

Auto-format JSON pages with collapsible tree view, syntax highlighting, dark mode, search filter. Best JSON viewer for developers.

Version
3.0.2

This one is built but not on a store yet. The page is here so you can see what it does.

JSON Formatter automatically detects and beautifully formats JSON responses in your browser. No more staring at raw, unformatted JSON.

Screenshots

What it does

  • Automatic JSON page detection (content-type, .json URLs, raw JSON)

  • Collapsible/expandable tree view with item counts

  • Syntax highlighting with distinct colors for strings, numbers, booleans, and null

  • Dark mode and light mode

  • Real-time search/filter across keys and values

  • Copy formatted JSON to clipboard

  • Customizable font size and default collapse depth

  • Expand All / Collapse All controls

  • Works offline, no data sent anywhere

  • Web developers debugging API responses

  • Backend developers testing endpoints

  • Data analysts reviewing JSON data

  • Anyone who works with JSON regularly

How to use it

  1. 01Open any JSON URL or API endpoint
  2. 02The extension automatically detects and formats the JSON
  3. 03Browse data with an interactive collapsible tree view

Permissions & privacy

storageSaves your settings and data in the browser's own storage, on this device.
webNavigationNotices when a tab moves to a new page.
tabsCan see the titles and addresses of your open tabs.
<all_urls>Every site — because it has to work on whatever page you're on.

This extension works entirely offline. No data is collected or transmitted. Your settings are stored locally on your device only. It runs only the code shipped inside the package — no remote code is fetched.

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