If you’ve ever encountered the error message “Uncaught ReferenceError: $ is not defined” while working with JavaScript, chances are you are using jQuery in your code and the jQuery library is not properly loaded. This error occurs when the browser cannot find the jQuery library and therefore cannot access the “$” symbol, which is the alias for the jQuery object.
To fix this error, you have a few options:

1. Ensure jQuery is properly loaded

The most common reason for this error is that the jQuery library is not included or loaded before your JavaScript code. Make sure you have included the jQuery library in your HTML file before any JavaScript code that relies on it.

By including the above script tag in the head or body section of your HTML file, you can ensure that jQuery is properly loaded.

2. Check for conflicts with other libraries

Another reason for the “$ is not defined” error is that there might be a conflict with another JavaScript library that uses the “$” symbol. This commonly occurs when you are using multiple libraries that both define their own “$” symbol.
To resolve this conflict, you can use the jQuery.noConflict() method to release control of the “$” symbol and assign it to a different variable. Here’s an example:

var jq = jQuery.noConflict();
jq(document).ready(function() {
    // Your jQuery code here
});

In the above code snippet, we have assigned the jQuery object to the variable “jq” using the jQuery.noConflict() method. Now you can use “jq” instead of “$” to access the jQuery object.

3. Use a local copy of jQuery

If you are experiencing issues with loading the jQuery library from a CDN (Content Delivery Network), you can try downloading the jQuery library and hosting it locally on your server. This way, you have full control over the file and can ensure it is properly loaded.
Download the jQuery library from the official website (https://jquery.com/) and save it in your project directory. Then, include it in your HTML file like this:

Replace “path/to” with the actual path to the jQuery file on your server.
By following these steps, you should be able to resolve the “Uncaught ReferenceError: $ is not defined” error and successfully use jQuery in your JavaScript code.