![]() The alternative is looking through multiple plugins and themes that could be causing the error. This gives you one place to find a quick validation. Look at the Network tab of your browser’s dev tools to see if jQuery is being loaded. Method 1: Use the Network Tab to Debug if jQuery Is Loading Here are a few options you can utilize to resolve this error and get your site back up to visitors. If you don’t already have a good text editor handy, now’s the time to install one. ![]() It’s not ideal for editing code through the WordPress dashboard code editor. But it would help if you were prepared to access your site’s code, either through SFTP or through your hosting environment. Don’t worry - you won’t need to write any code from scratch. Resolving this error takes some familiarity with adding, removing, and editing code. Once you’ve taken those necessary precautions, it’s time to fix that error. If you have the option, resolve the error on a staging or development site first, as Kinsta customers do, then confirm the fix and push those changes live. How To Fix the “jQuery Is Not Defined” Errorīefore we dive into the fix, remember to make a backup of your website before editing code! Even the most seasoned developers make mistakes now and again, and having a backup on hand will prevent you from losing any important work as you troubleshoot. Perhaps someone recently edited a core file or a plugin, which has now caused a conflict. There’s an error or typo in your version of jQuery.If you’re not using a CDN at all, you can rule out this possibility entirely. The CDN that you’re using to improve your site performance was unable to reach your server.Or perhaps a JavaScript file is not being correctly loaded when the page loads. The JavaScript on your website is running before the jQuery is fully loaded.Double-check your server resources or error log to confirm this. A slow or poor-performing hosting environment could increase the amount of time it takes your jQuery to perform when called.If you recently installed or activated new plugins or some of the plugins on your site have not been updated recently, this may be the cause. Old plugins installed on your WordPress site are conflicting with ones that you installed and activated more recently.There are a few possible things that could have occurred that threw the “jQuery is not defined” error: Your site was working just fine yesterday - what happened? This might be a bit of a head-scratcher. □ Learn how to fix it here! ⬇️ Click to Tweet Potential Causes of the “jQuery Is Not Defined” Error Whether you’re a stranger to WordPress errors or not, being met with “jQuery is not defined” while working on your website is never fun. jQuery is not defined” error in the console log. ![]() ![]() Because roughly 78% of the websites on the internet run on jQuery, this is a common error to find. ![]() This error can potentially shut down your site to visitors. For some reason, when the browser tried to load the website and called for that specific jQuery, it was not available. In plain English, this error is trying to tell you that something on your site - may be a plugin - requires jQuery to function on your site. What does “jQuery is not defined” actually mean? The handy console log in your browser is where you’ll probably discover this error. What Is the “jQuery Is Not Defined” Error? ![]()
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