How to fix “jQuery is not defined” error

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CDN Failures : Some sites rely on jQuery hosted on a Content Delivery Network (CDN) . If the CDN is unavailable or blocked, the site will not be able to load jQuery, resulting in the error.
All these issues can prevent jQuery from working smoothly. But don't worry, with our experience, we can guide you through the solutions to fix the problem.

There are several ways to resolve this error when you encounter it. Below are the most effective methods we have used to resolve this issue.

We recommend trying these strategies in no particular order, but you can use the jump links below if you want to start with a particular strategy:

Update WordPress, Themes, and Plugins
Check if jQuery is Loaded Properly
Add a jQuery Fallback
Fix Script Loading Order (Advanced)
Edit wp-config.php to Fix jQuery Loading Issues
Get Premium Support to Fix The Error for You
Bonus Resources: Troubleshooting WordPress Errors
We’ll go over each of these methods and provide you with some additional resources for argentina telemarketing data troubleshooting WordPress errors. Let’s get to the point!

1. Update WordPress, themes and plugins
Outdated software is one of the most common causes of the “jQuery is not defined” error. Outdated themes or plugins may not be compatible with the latest version of WordPress, resulting in script conflicts. To fix this:

First, make sure your WordPress core is up to date. Go to Dashboard ” Updates and click “Update to version XXX” if an update is available.

Update WordPress core
For more details, see our complete guide on safely updating WordPress to a new version .

WordPress plugin updates will be listed under the core update.