JSON Viewer Pro

Clean, fast JSON viewer for Chrome. Automatically detects and formats JSON responses with a collapsible tree view, search, and syntax highlighting. No ads, no tracking, no donation popups.

Features

• Auto-detect JSON pages in Chrome
• Collapsible tree view with syntax highlighting
• Search across keys and values
• Copy individual values or JSONPath-style paths
• Toggle between formatted tree view and raw JSON
• Light, dark, and auto (system) themes
• URL detection — clickable links in string values
• File size display

Installation

From Chrome Web Store

Coming soon

From GitHub Release

1. Download the latest json-viewer-pro.zip from Releases
2. Unzip into a folder
3. Open chrome://extensions/ and enable "Developer mode"
4. Click "Load unpacked" and select the unzipped folder
5. Navigate to any JSON URL — it's automatically formatted

From Source

1. Clone this repo
2. Open chrome://extensions/ and enable "Developer mode"
3. Click "Load unpacked" and select the repo directory
4. Navigate to any JSON URL to test

Testing

node tests/test-core.mjs

Open tests/test-json-detection.html in a browser for in-browser tests. Use tests/sample.json as a local test file (serve with a local HTTP server).

Privacy

This extension:

• Does NOT collect personal data
• Does NOT track your browsing
• Does NOT inject ads, donation popups, or promotional content
• Stores settings locally using Chrome's storage API
• See our full Privacy Policy

Store Listing Copy

Title

JSON Viewer Pro

Short Description

Clean, fast JSON viewer with tree view, search, and syntax highlighting. No ads, no tracking, no popups.

Detailed Description

JSON Viewer Pro automatically detects and formats JSON responses in your browser.

Features:

• Collapsible tree view with syntax highlighting
• Search across keys and values with highlighting
• Copy individual values or full JSON paths
• Toggle between formatted and raw JSON
• Light, dark, and auto themes (follows your system preference)
• URL detection — clickable links in string values
• File size display in the toolbar

Why JSON Viewer Pro?

• Zero tracking or analytics — your data stays on your device
• No ads, donation popups, or injected content
• Fast and lightweight
• Clean, modern UI with dark mode support
• Open source

Category

Developer Tools

Search Keywords

json, json viewer, json formatter, json editor, json tree, json pretty print, api response viewer, developer tools