Fix jQuery undefined error in WordPress

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If you see a "jQuery is not defined" error in your WordPress admin area (or elsewhere), don't worry: you're not alone. This is a common question asked by many WordPress users. That said, it can be frustrating when your website doesn't perform as expected.

We’ve been using WordPress for over a decade, and in that time we’ve learned how to fix some of the most common WordPress errors. Among them is the "jQuery is not defined" error.

In this guide, we’ll discuss why this error occurs and, more importantly, how to fix it. We'll explain everything in simple terms so that even non-developers can follow along and resolve issues quickly.

What causes "jQuery is not defined" errors?
jQuery is a widely used JavaScript library in WordPress that france phone number helps perform many interactive functions. However, sometimes it doesn't load correctly, which can affect the functionality of your site.

The error appears in the developer tools under the "Control" tab, so many users may not notice it until there is an issue with their site.

JQuery is not defined error in console
If you see a "jQuery is not defined" error, it means WordPress can't load it correctly. We've helped countless users solve this problem over the years and have learned that it often stems from a few common causes:

Theme or Plugin Not Updated: Many users encounter this error when their theme or plugin is not updated to the latest version of WordPress. This usually happens after a major WordPress update.
Improper script loading: jQuery must be loaded before other JavaScript files. Otherwise, scripts that rely on jQuery will crash. This usually happens if the theme or plugin is not properly coded to load the script.
JavaScript conflicts: Other scripts executed on the site may conflict with jQuery, especially if they are not loaded correctly. This conflict can break jQuery, causing errors.
CDN failure: Some websites rely on jQuery hosted on a content delivery network (CDN). If the CDN is unavailable or blocked, the website will not be able to load jQuery, resulting in errors.
All of these issues can prevent jQuery from functioning smoothly. But don’t worry: with our experience, we can guide you to a solution to your problem.