How To Know If Jquery Is Installed

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jQuery is an extremely popular and widely used JavaScript library that makes it easier to work with HTML documents, handle events, create animations, and perform other common tasks on the Web. In this blog post, we’ll explore different methods to check if jQuery is installed on a website or not.

Method 1: Check in the browser console

One of the simplest ways to check if jQuery is installed on a website is by using the browser’s developer console. To do this, follow the steps below:

  1. Open the website you want to check for jQuery installation in your browser.
  2. Press F12 or right-click anywhere on the webpage and select Inspect to open the developer console.
  3. Click on the Console tab if it’s not already active.
  4. Type jQuery and hit Enter. If jQuery is installed, you’ll see the jQuery function displayed in the console, along with its version number. If it’s not installed, you’ll see an error message, such as “ReferenceError: jQuery is not defined.”

Here’s an example of what it would look like if jQuery is installed:

    function (a, b) {
        return new r.fn.init(a, b);
    }
    jquery: "3.6.0"

Method 2: Check the source code

Another way to check if jQuery is installed on a website is by examining its source code to see if the library is included. To do this, follow the steps below:

  1. Open the website you want to check for jQuery installation in your browser.
  2. Press Ctrl + U or right-click anywhere on the webpage and select View page source to view the source code of the webpage.
  3. Press Ctrl + F and search for “jquery” in the source code.
  4. If the library is included, you should see a line of code similar to the following:
    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>

Note that the version number and the URL might be different, depending on the version of jQuery being used.

Method 3: Use a browser extension

Several browser extensions are available that can help you quickly check if jQuery or other popular JavaScript libraries are being used on a website. Some popular options include:

After installing one of these extensions, you can simply visit a website and click on the extension’s icon to see a list of detected JavaScript libraries, including jQuery if it’s installed.

Conclusion

Knowing whether jQuery is installed on a website is useful for developers, especially when debugging or optimizing a site. With the methods outlined in this blog post, you can quickly determine if jQuery is being used on any given website. Happy coding!