Immutable.js devtools extension

by jdeniau · immutable-js.com · Developer Tools

Established publisherManifest V3 Free

View in Chrome Web Store Data as of 15 Oct 2026

Makes Immutable JS objects more readable when they are logged to the console.

Users

168

−7 in 30 days

Rating

5.0 / 5

unchanged in 30 days

Ratings

0 in 30 days

Store rank

#68K

#57K among extensions

Version

2.1.8

updated 26 Aug 2026

Users

monthly, 17 months

Latest, 15 Oct 2026: 168 usersMove the mouse over the chart for any month

Ratings count

monthly, 17 months

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 Immutable.js devtools extension

The Immutable library is fantastic, but inspecting immutable collections in browser's Dev Tools is awkward. You only see the internal data structure, not the logical contents. For example, when inspecting the contents of an Immutable List, you'd really like to see the items in the list. Chrome (v47+) and Firefox (116+) has support for custom "formatters". A formatter tells browser's Dev Tools how to display values in the Console, Scope list, etc. This means we can display Lists, Maps and other collections, in a much better way.