How to Add JavaScript to WordPress Pages or Posts

how to add javascript to wordpress

Do you want to add JavaScript to your WordPress pages or posts?

We often remove unused JavaScript in WordPress to improve Core Web Vitals score, but In some situations, we need to add Custom JavaScript to our entire site or into specific pages and posts. 

how to add javascript to wordpress

In this tutorial, I’m going to show you how to add JavaScript to WordPress pages or posts easily.

1. What is JavaScript?

JavaScript is a scripting or programming language that allows you to implement complex features on web pages — every time a web page does more than just sit there and display static information for you to look at — displaying timely content updates, interactive maps, animated 2D/3D graphics, scrolling video jukeboxes, etc. (developer.mozilla.org)

A typical JavaScript code snippet may look like this:

Javascript wordpress

There are 3 ways to add JavaScript to your WordPress site.

2. Add JavaScript to the entire WordPress Site using a plugin

You can manually add the code to your header.php or footer.php files, but these changes will be overwritten when you update or change your theme. That’s why we recommend using a WordPress plugin to add JavaScript to your entire WordPress site.
The best plugin for the job is the Insert Headers and Footers plugin by WPBiginner.

Insert headers and foooters by wpbeginner

The first thing you need to do is install and activate the plugin. For more details, see our step-by-step guide on how to install a WordPress plugin. Upon activation, you need to go to Settings » Insert Headers and Footers.

Insert headers and foooters setting plugin

The plugin will now automatically load the code you added on every page of your website. You can now paste the JavaScript you copied into one of these boxes and click on the ‘Save’ button.

3. Adding JavaScript Code to WordPress Manually Using Code

If you want to manually add JavaScript code to WordPress, you can simply copy the following code into the functions.php file in your WordPress Theme, or you can also use a Plugin.

Adding JavaScript Code to WordPress Manually

Adding JavaScript to a Specific WordPress Post or Page Using Code

If you only want to add JavaScript to a single WordPress post or single WordPress page, then you will need to add conditional logic to the code.

Adding JavaScript Code to WordPress post or page

Take a look at the following code snippet: ( Adding JavaScript to a Specific WordPress Post, Page is the same )

Adding JavaScript Code to WordPress post

The code above will only run the JavaScript if the post ID matches ’3793’. Make sure you replace the ’5’ with your own post ID.

Adding JavaScript Code to WordPress

To find the post ID open up the post where you want the JavaScript to run. Then, in the URL of the page, you’ll find the post ID.

4. Questions about How to add JavaScript to WordPress

4.1 How do I add JavaScript to a single page in WordPress?

4.2 How do I add JavaScript to my WordPress admin?

4.3 How do I include JavaScript and CSS files in WordPress?

4.4 Can you insert JavaScript in WordPress?

4.5 How do I add JavaScript to a single page in WordPress?

4.6 How do I add JavaScript to my WordPress admin?

4.7 How do I include JavaScript and CSS files in WordPress?

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