JSON Viewer icon

JSON Viewer

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

A beautiful, customizable JSON/JSONP viewer and highlighter. Open-source fork: https://github.com/Lysak/json-viewer

Users
189
−1 in 30 days
Rating
5.0 / 5
unchanged in 30 days
Ratings
1
0 in 30 days
Store rank
#65K
#55K among extensions
Version
0.19.0
updated 19 Dec 2025

Users

monthly, 15 months
0102204Jul 2025Mar 2026Oct 2026
Latest, 15 Oct 2026: 189 usersMove the mouse over the chart for any month

Ratings count

monthly, 15 months
001Jul 2025Mar 2026Oct 2026
Latest, 15 Oct 2026: 1 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 * 27 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/tulios Bugs and suggestions https://github.com/tulios/json-viewer/issues Contributors Thiago Pontes (@thiagopnts) @bluec0re @North101 Ben Hollander (@benhollander) Mehdi Bahrami (@mehdibahraami) Reimund Trost (@reimund) Ben van Enckevort (@benvan) License MIT License Any questions tweet me @tulios

Growth

WindowUsersChangeRatingsRating
7 days+2+1.1%00.00
30 days−1−0.5%00.00
6 months−9−4.5%00.00
1 year+68+56.2%00.00

Version history

1 versions recorded
0.19.022 Jul 2025

Details

Category
Developer Tools
First seen
22 Jul 2025
Size
1.1 MB
Languages
en
Pricing
Free
Support
github.com
Extension ID
infiapocoodhkofhjboemkonbjboopbj

Permissions and risk

Moderate riskimpact 2, likelihood 2
Permissions
storage
Site access
*://*/*<all_urls>
Can read and change data on every website you visit.

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