jQuery's jquery-1.10.2.min.map is triggering a 404 (Not Found)

javascript jquery google-chrome-devtools
Paul Irish picture Paul Irish · Aug 21, 2013 · Viewed 462.6k times · Source

I'm seeing error messages about a file, min.map, being not found:

GET jQuery's jquery-1.10.2.min.map is triggering a 404 (Not Found)

Screenshot

enter image description here

Where is this coming from?

Answer

Paul Irish picture Paul Irish · Aug 21, 2013

If Chrome DevTools is reporting a 404 for a .map file (maybe jquery-1.10.2.min.map, jquery.min.map or jquery-2.0.3.min.map, but can happen with anything) first thing to know is this is only requested when using the DevTools. Your users will not be hitting this 404.

Now you can fix this or disable the sourcemap functionality.

Fix: get the files

Next, it's an easy fix. Head to http://jquery.com/download/ and click the Download the map file link for your version, and you'll want the uncompressed file downloaded as well.

enter image description here

Having the map file in place allows you do debug your minified jQuery via the original sources, which will save a lot of time and frustration if you don't like dealing with variable names like a and c.

More about sourcemaps here: An Introduction to JavaScript Source Maps

Dodge: disable sourcemaps

Instead of getting the files, you can alternatively disable JavaScript source maps completely for now, in your settings. This is a fine choice if you never plan on debugging JavaScript on this page. Use the cog icon in the bottom right of the DevTools, to open settings, then: enter image description here

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