JSONer - JSON Viewer & Formatter

Unknown author · Developer Tools

Open in Chrome Web Store

Users

Avg rating

—

Ratings

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Updated

Aug 15, 2026

Media

3 items

Description

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

History

30d 90d 1y all

rating_count is the Chrome Web Store ratings count, not a written-review count.

Details & SEO

SEO signals

Listing completeness signals

Title length
Characters in the extension name.
32
Description length
Characters in the listing description.
766
Media assets
Screenshots and videos on the listing.
3
Has promo video
Whether the listing includes at least one video.
No
Languages
Declared language locales.
1
Developer website
Listing exposes a developer website URL.
No
Contact email
Listing exposes a contact email.
Yes
Keyword in name
Case-insensitive substring match in the name.
—
Keyword in description
Case-insensitive substring match in the description.
—
Keyword occurrences in description
Count of case-insensitive occurrences in the description.
—
Category user-count percentile
Share of same-category extensions with fewer users (null if unknown).
14.7

These are transparent listing completeness / keyword signals, not a prediction of Chrome Web Store search ranking.