JSONer - JSON Viewer & Formatter

by TechCauldron · Developer Tools

Manifest V3 Free

View in Chrome Web Store Data as of 16 Oct 2026

Fast, private JSON & JSONP viewer: highlighting, collapsing, 30+ themes, dark mode. Nothing leaves your browser.

Users

+3 in 30 days

Rating

0.0 / 5

unchanged in 30 days

Ratings

0 in 30 days

Store rank

#238K

#199K among extensions

Version

1.0.0

updated 15 Aug 2026

Users

monthly, 2 months

Latest, 16 Oct 2026: 6 usersMove the mouse over the chart for any month

Ratings count

monthly, 2 months

Latest, 16 Oct 2026: 0 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 JSONer - JSON Viewer & Formatter

JSONer makes JSON readable. Open any JSON or JSONP response and get an instant, collapsible, syntax-highlighted tree instead of a wall of text. • Automatic - activates on any JSON/JSONP page, no clicking required • Collapsible nodes, line numbers, and one-click raw/parsed toggle • 30+ themes including full dark mode • Fast on large documents • 100% private - parsing happens locally in your browser. JSONer sends your data nowhere and requires no account. JSONer is an actively maintained, Manifest V3 rebuild of the classic open-source "JSON Viewer" by Túlio Ornelas, updated to keep working in current Chrome. Open source under the MIT license.