Why Does My Chrome DevTools Show a 404 Error for 'jquery-1.10.2.min.map'?

jQuery's jquery-1.10.2.min.map: Where Does This Not Found 404 Error Originate From?

When using Chrome DevTools, a 404 error may appear when attempting to locate a file with the extension ".map," such as jquery-1.10.2.min.map. Rest assured, this error occurs solely within the DevTools and does not affect your users.

Fix: Obtain the Files

To resolve this issue, simply retrieve the map file from jQuery's download page at http://jquery.com/download/. Select the corresponding "Download the map file" link for your jQuery version and download the uncompressed file as well.

Placing the map file in the appropriate location enables you to debug minified jQuery code using the original sources, eliminating the hassle of deciphering obscure variable names.

Disable Sourcemaps: An Alternative

Instead of obtaining the files, you can disable JavaScript source maps completely within your DevTools settings if you do not plan to debug JavaScript on the affected page. Navigate to the settings by clicking the cog icon at the bottom right of DevTools and locate the following option:

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