# JSON Viewer+

> The most beautiful and customizable JSON/JSONP highlighter that your eyes have ever seen

Canonical page: [https://chrome-stats.com/d/json-viewer-plus](https://chrome-stats.com/d/json-viewer-plus)

## Overview

- **ID:** `json-viewer-plus`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** rxliuli
- **Category:** web-development
- **Daily users:** 1
- **Version:** 0.19.7
- **Last updated:** 2026-05-13
- **First published:** 2026-04-03
- **Size:** 359 KB
- **Data as of:** 2026-09-14
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/json-viewer-plus/)
- **Website:** [https://rxliuli.com/project/json-viewer/#support](https://rxliuli.com/project/json-viewer/#support)

## Description

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:
<ul><li>Syntax highlighting with 27 built-in themes</li><li>Collapsible/foldable nodes</li><li>Clickable URLs within JSON values</li><li>Line numbers</li><li>Search within JSON content</li><li>Sort keys alphabetically</li><li>Works with JSONP responses</li><li>Handles numbers larger than Number.MAX_VALUE</li><li>Customizable tab size, themes, and CSS</li><li>Omnibox integration: type "json-viewer" in the address bar to format JSON or open a scratch pad</li><li>Configurable max file size for highlighting</li></ul>
The extension only activates when it detects JSON content. It does not collect any data.

Source code: <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/1c02cdb2e04cbcb64c2a8e2a31ac784fb5a5d6abea61944927a060c92d1dad69/https%3A//github.com/rxliuli/json-viewer" rel="nofollow">https://github.com/rxliuli/json-viewer</a>
Original project: <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/6b74752caa31f2f399908c29e721b3f5e24a6cefdabb8a8c36dcf8bf4bb0869d/https%3A//github.com/tulios/json-viewer" rel="nofollow">https://github.com/tulios/json-viewer</a>

## Rankings

- #117,662 — Overall
- #67 — json

## Permissions and access

### Permissions

- `storage`

### Host permissions

- `<all_urls>`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** High risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/json-viewer-plus)