How to Fix WordPress 'jQuery is not defined' Error (6 Ways)
Posted: Thu Apr 17, 2025 10:25 am
If you’re seeing the “jQuery is not defined” error in your WordPress admin area (or elsewhere), don’t worry: you’re not alone. This is a common problem for many WordPress users. That said, it can be frustrating when your site doesn’t work as expected.
We have been working with WordPress for over a decade and in that time we have learned how to fix some of the most common WordPress errors. One of them is the “jQuery is not defined” error.
In this guide, we will discuss why this error occurs and, more importantly, how to fix it. We will explain everything in simple terms, so that even non-developers can follow along and quickly resolve the issue.
Fixing jQuery not defined error in WordPress
What causes the “jQuery is not defined” error?
jQuery is a widely used JavaScript library in WordPress that helps to perform many interactive argentina telemarketing data functions. However, sometimes it does not load properly and this may affect the functionality of your website.
The error appears in Developer Tools under the Console tab, so many users may not notice it until something breaks on their site.
JQuery not defined error in the console
If you see the “jQuery is not defined” error, it means that WordPress is having trouble loading it properly. Over the years, we’ve helped countless users fix this problem and have learned that it usually stems from a few common causes:
Outdated Themes or Plugins : Many users encounter this error when their themes or plugins are not updated to the latest version of WordPress. This often happens after major WordPress updates.
Improper Script Loading - jQuery must be loaded before other JavaScript files. Otherwise, scripts that depend on jQuery will break. This often happens if themes or plugins are not coded properly to load scripts.
JavaScript Conflicts : Other scripts running on your site can conflict with jQuery, especially if they are not loaded properly. This conflict can break jQuery, causing the error.
We have been working with WordPress for over a decade and in that time we have learned how to fix some of the most common WordPress errors. One of them is the “jQuery is not defined” error.
In this guide, we will discuss why this error occurs and, more importantly, how to fix it. We will explain everything in simple terms, so that even non-developers can follow along and quickly resolve the issue.
Fixing jQuery not defined error in WordPress
What causes the “jQuery is not defined” error?
jQuery is a widely used JavaScript library in WordPress that helps to perform many interactive argentina telemarketing data functions. However, sometimes it does not load properly and this may affect the functionality of your website.
The error appears in Developer Tools under the Console tab, so many users may not notice it until something breaks on their site.
JQuery not defined error in the console
If you see the “jQuery is not defined” error, it means that WordPress is having trouble loading it properly. Over the years, we’ve helped countless users fix this problem and have learned that it usually stems from a few common causes:
Outdated Themes or Plugins : Many users encounter this error when their themes or plugins are not updated to the latest version of WordPress. This often happens after major WordPress updates.
Improper Script Loading - jQuery must be loaded before other JavaScript files. Otherwise, scripts that depend on jQuery will break. This often happens if themes or plugins are not coded properly to load scripts.
JavaScript Conflicts : Other scripts running on your site can conflict with jQuery, especially if they are not loaded properly. This conflict can break jQuery, causing the error.