JSON Viewer+
JSON Viewer highlights JSON(P)
Only for Mac
$4.99
Mac
JSON Viewer highlights JSON and JSONP content directly in your browser. When you open a URL that returns JSON, the extension automatically formats and syntax-highlights it.
This is a maintained fork of the original JSON Viewer by Tulio Ornelas, updated to work with modern browsers (Manifest V3).
Features:
- Syntax highlighting with 27 built-in themes
- Collapsible/foldable nodes
- Clickable URLs within JSON values
- Line numbers
- Search within JSON content
- Sort keys alphabetically
- Works with JSONP responses
- Handles numbers larger than Number.MAX_VALUE
- Customizable tab size, themes, and CSS
- Omnibox integration: type "json-viewer" in the address bar to format JSON or open a scratch pad
- Configurable max file size for highlighting
The extension only activates when it detects JSON content. It does not collect any data.
Source code: https://github.com/rxliuli/json-viewer
Original project: https://github.com/tulios/json-viewer
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Three new Rosé Pine themes added – Rosé Pine, Moon, and Dawn. Thanks to ThatOneCalculator for the contribution.
The developer, KAI WANG, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- KAI WANG
- Size
- 652.4 KB
- Category
- Developer Tools
- Compatibility
Requires macOS 26.4 or later.
- Mac
Requires macOS 26.4 or later.
- Mac
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © Copyright (c) 2026 rxliuli
