JSON Viewer icon

JSON Viewer

by Master Tools · Developer Tools
Manifest V3 Free
View in Chrome Web Store Data as of 15 Oct 2026

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

Users
344
−14 in 30 days
Rating
5.0 / 5
unchanged in 30 days
Ratings
4
0 in 30 days
Store rank
#51K
#43K among extensions
Version
3.0.1
updated 29 Jan 2025

Users

monthly, 2 years
0195390Sep 2024Oct 2025Oct 2026
Latest, 15 Oct 2026: 344 usersMove the mouse over the chart for any month

Ratings count

monthly, 2 years
0510Sep 2024Oct 2025Oct 2026
Latest, 15 Oct 2026: 4 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About JSON Viewer

It is a Chrome extension for printing JSON and JSONP. Notes: * This extension might crash with other JSON highlighters/formatters, you may need to disable them * To highlight local files and incognito tabs you have to manually enable these options on the extensions page * Sometimes when the plugin updates chrome leaves the old background process running and revokes some options, like the access to local files. When this happen just recheck the option that everything will work again * Works on local files (if you enable this in chrome://extensions) Features * Syntax highlighting * 26 built-in themes * Collapsible nodes * Clickable URLs (optional) * URL does not matter (the content is analysed to determine if its a JSON or not) * Inspect your json typing "json" in the console * Hot word `json-viewer` into omnibox (type `json-viewer` + TAB and paste your JSON into omnibox, hit ENTER and it will be highlighted) * Toggle button to view the raw/highlighted version * Works with numbers bigger than Number.MAX_VALUE * Option to show line numbers * Option to customize your theme * Option to customize the tab size * Option to configure a max JSON size to highlight * Option to collapse nodes from second level + Button to unfold all collapsed nodes * Option to include a header with timestamp + url * Option to allow the edition of the loaded JSON * Option to sort json by keys * Option for C-style braces and arrays * Scratch pad, a new area which you can type/paste JSON and format indefinitely using a button or key shortcut. To access type `json-viewer` + `TAB` + `scratch pad` ENTER This plugin is open source https://github.com/mrfanii/JSON-Viewer-v3 Bugs and suggestions https://github.com/mrfanii/JSON-Viewer-v3/issues License MIT License

Growth

WindowUsersChangeRatingsRating
7 days−15−4.2%00.00
30 days−14−3.9%00.00
6 months−7−2.0%00.00
1 year+111+47.6%+20.00

Chrome Web Store search rankings

Where JSON Viewer appears when people search the store, with the 30 day change
Search phrasePosition30 days
json#67+2

Version history

2 versions recorded
3.0.129 Jan 2025
3.0.04 Sep 2024

Details

Category
Developer Tools
First seen
4 Sep 2024
Size
453 KB
Languages
en
Pricing
Free
Privacy policy
freebusinessapps.net
Extension ID
lbigodiljbelalmflhlapgiclaieahae

Permissions and risk

Low riskimpact 2, likelihood 1
Permissions
scriptingactiveTabstorage
Site access
<all_urls>
Can read and change data on every website you visit.

Alternatives to JSON Viewer

Extensions that rank for the same store searches or share the Developer Tools category, ordered by users