ECMA Visualizer

by Korea University · Developer Tools

Manifest V3 Free

View in Chrome Web Store Data as of 16 Oct 2026

Provides Example Programs for ECMA-262, the ECMAScript Language Specification.

Users

−5 in 30 days

Rating

5.0 / 5

unchanged in 30 days

Ratings

0 in 30 days

Store rank

#133K

#111K among extensions

Version

1.4.0

updated 3 Jan 2026

Users

monthly, 2 years

Latest, 16 Oct 2026: 28 usersMove the mouse over the chart for any month

Ratings count

monthly, 2 years

Latest, 16 Oct 2026: 3 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 ECMA Visualizer

This Chrome extension is an implementation of the tool presented in the paper “JSSpecVis: A JavaScript Language Specification Visualization Tool,” accepted for publication in the Demonstration track at FSE 2025. This Chrome extension is developed to support an intuitive understanding of the javascript specification by providing example programs for each part of the specification with a call-path context selected by the readers. In addition, the extension supports a debugging feature called resume, which allows users to start debugging from the exact position of the selected step on our debugger on an external website.