JSONView

View JSON documents in the browser.

JSONView: Simplify JSON Viewing in Firefox

JSONView is a convenient Firefox add-on designed to format and enhance your JSON document viewing experience. While Firefox includes its own JSON viewer, JSONView offers an improved interface that allows you to easily read, highlight, and collapse objects and arrays for better navigation. Even if your JSON contains errors, this add-on will still display the raw text for any troubleshooting you might need.

Once you've installed JSONView, you can test its features by visiting this example JSON. Discover a more organized way to interact with JSON data right in your browser!

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By:: Ben Hollis
Daily users:: 21,239+ -79
Rating:: 4.15
(84)
Version:: 3.1.0 (Last updated: 2025-01-23)
Version code:: 5875231
Creation date:: 2009-02-23
Risk:: High risk impact Moderate risk likelihood
Permissions:: webRequest
storage
webRequestBlocking
Host permissions:: <all_urls>
Size:: 84.53K
URLs:: Website
Full description:: See detailed description
Source:: Firefox Browser Add-ons
Updated:: a day ago

Ranking

# 505 ▼ 3

Other rankings

#44 in Web Development

#8 in documentation keyword 39

#11 in json keyword 73

#12 in document keyword 42 ▼ 1

#31 in review keyword 29 ▼ 1

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User reviews

Pros

Super easy to use
Nice, easy to read interface
Ability to collapse/expand JSON elements

Cons

Recent update introduced incorrect rounding of small numbers
Plugin makes requests on all URLs contained in JSON, leading to potential security issues

Most mentioned

Incorrect rounding of small numbers in recent update
Plugin requests URLs which could lead to security vulnerabilities

These summaries are automatically generated weekly using AI based on recent user reviews. User reviews may be inaccurate, spammy, or outdated.

User reviews

by 退出中共邪教党团队保命, 2025-03-27

by 远离中共邪教快退出党团队, 2025-02-12

As of the recent update I've noticed a rather breaking change. My API returns json with very small numbers: eg "transform": [ 4.371139e-8, 1.080646e-7, ] As of the recent update, this now shows up as: "transform" [ 4, 1 ] Which is totally wrong, if you round to 0 it would be more acceptable, but rounding to 4 and 1 in this case is totally wrong and actually caused me to have a panic attack this morning thinking all our data was suddenly corrupt. Could you please provide a patch fix for this soon, as I love the other features of this plugin. EDIT: looks like you already noticed: https://github.com/bhollis/jsonview/commit/a6692b8d20b6d88524395887e66e25ee7757e2bd 41 minutes ago haha

by Firefox user 18470510, 2024-06-19

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Add-on safety

Risk impact

JSONView requires some sensitive permissions that could impact your browser and data security. 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

JSONView is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details

Medium This extension was updated in the past 3 months. New updates may not be stable or safe.
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Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
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