JSON Formatter icon

JSON Formatter

by Code Formatter · callumlocke.com · Developer Tools
FeaturedEstablished publisherManifest V3 Free
View in Chrome Web Store Data as of 15 Oct 2026

Makes JSON easy to read

Users
2M
0 in 30 days
Rating
1.5 / 5
−2.76 in 30 days
Ratings
2,086
−1 in 30 days
Store rank
#213
#202 among extensions
Version
0.10.2
updated 16 May 2026

Users

monthly, 3 years
600K1.3M2MAug 2023Apr 2025Oct 2026
Latest, 15 Oct 2026: 2,000,000 usersMove the mouse over the chart for any month

Ratings count

monthly, 3 years
5001,2932,086Aug 2023Apr 2025Oct 2026
Latest, 15 Oct 2026: 2,086 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 Formatter

The original JSON Formatter, now with optional dark mode 🌚 Auto-formats JSON when you load it in a browser tab. FEATURES - Fast, even on very long JSON pages - Dark mode - Syntax highlighting - Collapsible trees, with indent guides - Clickable URLs - Negligible performance impact on non-JSON pages (less than 1 millisecond) - Works on any valid JSON page – URL doesn't matter - Buttons for toggling between raw and parsed JSON - FIXED: Exports the parsed JSON to window.json so you can explore it in Dev Tools Note: this extension might clash with other browser extensions that modify the DOM before it runs. If it doesn't seem to be working, try disabling other extensions. If it clashes with an extension you need, open an issue and I'll try to find a solution. SOME EXAMPLE JSON PAGES to try it out on: https://callumlocke.github.io/json-formatter/ PRO TIP Hold down control (or cmd on Mac) while collapsing a tree - collapses all siblings too. PRIVACY No tracking, no advertising, and nothing else nefarious. SOURCE CODE github.com/callumlocke/json-formatter ISSUES github.com/callumlocke/json-formatter/issues

Growth

WindowUsersChangeRatingsRating
7 days0+0.0%0−2.76
30 days0+0.0%−1−2.76
6 months0+0.0%+47−2.83
1 year0+0.0%+191−3.07

Chrome Web Store search rankings

Where JSON Formatter appears when people search the store, with the 30 day change
Search phrasePosition30 days
json#10
format#13+2
source code#27+1
example#30+10
code#100new

Version history

15 versions recorded
0.10.216 May 2026
0.10.026 Feb 2026
0.9.419 Feb 2026
0.9.318 Jan 2026
0.9.112 Jan 2026
0.9.08 Jan 2026
0.8.110 Nov 2025
0.8.021 Sep 2025

Details

Category
Developer Tools
First seen
20 Apr 2020
Size
20 KB
Languages
en
Pricing
Free
Extension ID
bcjindcccaagfpapjjmafapmmgkkhgoa

Permissions and risk

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

Alternatives to JSON Formatter

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