JSON Viewer

Name: JSON Viewer
Rating: 4.540515653775322 (1086 reviews)
Author: tulios

The most beautiful and customizable JSON/JSONP highlighter that your eyes have ever seen. Open source at https://goo.gl/fmphc7

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JSON Viewer is a feature-rich Chrome extension designed for clear and customizable visualization of JSON and JSONP data. It offers syntax highlighting with 27 built-in themes, collapsible nodes for easy navigation, clickable URLs, and supports large numbers beyond JavaScript's standard limits.

Users can toggle between raw and highlighted views, enable line numbers, customize themes and tab sizes, sort JSON keys, and even edit loaded JSON data. Additional features include a scratch pad for formatting JSON on the fly, omnibox integration for quick JSON highlighting, and support for local files and incognito browsing (with manual enabling).

Open source and actively maintained, JSON Viewer ensures a visually appealing and practical experience for developers and enthusiasts working with JSON data.

Extension Developer Tools Productivity Open Source

By:

tulios

Users:

1,000,000

Rating:

4.54

(1,086)

Version:

0.18.1 Last updated: 2020-12-23

Creation date:

2017-10-23

Risk:

Permissions:

*://*/*
<all_urls>

Size:

310.00KB

Email:

or*****@gmail.com

Full description:

Source:

Chrome Web Store

Data ingested on:

2025-07-09

Ranking

# 272 ▲ 1

Other rankings

#577 in Developer Tools ▼ 1

#1 in viewer keyword 71

#2 in json keyword 68

#9 in plugin keyword 63

#14 in options keyword 12 ▼ 1

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User reviews

Most users find the JSON Viewer extension reliable, simple to use, and effective for formatting JSON files, even large ones. Key features praised include configuration flexibility and line number display. However, multiple users report issues with compatibility, particularly on certain browsers like Edge, and note the extension may be outdated or non-functional recently. Additionally, some users struggle due to minimal usage guidance and necessary settings changes. Clear communication about fees is also requested.

Pros

Works well for viewing and formatting JSON, including large files
Provides useful configuration options like collapsing or expanding properties
Simple and easy to use for many users
Supports different browsers such as Brave and Chrome
Shows line numbers during JSON viewing, improving readability

Cons

Does not work or has compatibility issues on some browsers like Edge
Some users find it outdated or non-functional recently
Lacks clear or sufficient usage instructions, making it hard for some to use
Requires enabling certain settings (like file URL access) to work properly
Some users expressed frustration about lack of upfront information regarding registration fees

Recent reviews

I've been using it for years and it works perfectly for me.

Gi*****, 2025-07-05

Please, "follow best practices for Chrome extensions" ;)

Se*****, 2025-05-04

FKU GOOGLE!这么好的插件不给用

25*****, 2025-04-15

View all user reviews ›

Extension safety

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

JSON Viewer requires a few sensitive permissions. Exercise caution before installing.

Risk impact analysis details

Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
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Risk likelihood

Risk likelihood measures the probability that a Chrome extension may turn malicious. This is determined by the publisher and the Chrome extension reputation on Chrome Web Store, the amount of time the Chrome extension has been around, and other signals about the Chrome extension. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Chrome extension.

JSON Viewer has earned a good reputation and can be trusted.

Risk likelihood analysis details

Low This extension was updated more than 6 months ago. Older versions are more likely to be stable and safe.
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