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

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

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.

Disable

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 select 'Enable JS Source Maps'.

JavaScript Debugging

An easy way to debug JavaScript is to use your web browsers developer tools. By including the following in your code, debug information is written to the console window.

console.log(“Hello World”);