Source Mapper

Name: Source Mapper
Rating: 3.86 (7 reviews)
Author: RyanSylvestre

A utility to get the original source code from a source map

As of May 2026, Source Mapper has 279 users and a 3.86/5 rating from 7 reviews in the Developer Tools category.

RyanSylvestre Developer Tools

Chrome Web Store ↗.crx

Users−11.7%

279

Rating0%

3.86

7 reviews

Reviews0%

Version

1.2.5

Manifest V2

History

3 snapshots

Tracking since Apr 1, 2026.

View as table

Date	Users	Rating	Reviews	Version
Apr 1, 2026	316	3.86	7	1.2.5
Apr 30, 2026	307	3.86	7	1.2.5
May 28, 2026	296	3.86	7	1.2.5
Now	279	3.86	7	1.2.5

Permissions & access

Permissions: None declared
Host access: http://*/*, https://*/*

Screenshots

About

What are source maps?
http://www.html5rocks.com/en/tutorials/developertools/sourcemaps

Why
This works well in conjunction with JavaScript error capture. However you will need both line and column numbers. This can be difficult with a simple window.onerror handler as that does not provide the column information. 

There are various libraries that will wrap native functions with try/catches that could provide the column from error.stack. Use at your own risk (not sure how I feel about them)

In my case (enterprise) we have mostly IE8 users at the moment, during window.onerror it is possible to either A. Walk to callee and build a stack or B. Use window.error.errorcharacter to capture the column number. This is what I am going to be doing for the time being.


Tested with
Source Map Version 3
JavaScript source files

Source: https://github.com/RyanSylvestre/sourceMapper
Link to store: https://chrome.google.com/webstore/detail/enenhalmnhnpofkecebdmgnmmhfkhcpb