Why Does 'GET jQuery's jquery-1.10.2.min.map is triggering a 404 (Not Found)' Error Occur in Chrome DevTools?

jQuery's jquery-1.10.2.min.map Not Found Error Explained and Resolved

When using Chrome DevTools, you may encounter the error message: "GET jQuery's jquery-1.10.2.min.map is triggering a 404 (Not Found)."

What is this Error?

The .map file is used by DevTools to map minified code back to its original source for debugging purposes. When DevTools cannot locate this file, it triggers the 404 error.

Impact on Users

It's important to note that your users will not experience this 404 error. It only occurs within DevTools.

Fixing the Error

To fix the error and enable source map debugging, follow these steps:

1. Download the Map File: Head to jquery.com/download and click the "Download the map file" link for your jQuery version. Also, download the uncompressed file.
2. Place the Files: Move the downloaded .map file to the same location as the minified jQuery file.

Disabling Source Maps

If you do not wish to download the map file, you can disable source map functionality in DevTools settings:

1. Open DevTools settings by clicking the cog icon.
2. Uncheck the "Enable JavaScript source maps" option.

Conclusion

By understanding the source of the 404 error and implementing the appropriate solution, you can continue debugging your minified jQuery code and save yourself frustration.

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