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How To Detect If Caps Lock Is On Using Pure JavaScript?

There are quite a few scripts out there for checking whether the Caps Lock key is on. However, the top searches for a helpful JavaScript function turn up a lot of dated, obsolete code that usually doesn’t work or uses techniques that are frowned upon, such as obtrusive JavaScript.

This technique is intended for use on login screens where usernames and passwords are case-sensitive. If the user begins typing into a field with the Caps Lock on, the web page can notify them before an invalid login attempt.

All modern browsers (with the exception of Opera Mini) support this method:

To check if the caps lock is on, you use the getModifierState() method of the KeyboardEvent object. The getModifierState() method returns true if a modifier is active; otherwise, it returns false. The event.getModifierState('CapsLock') can be used to detect if the caps lock is on. The following shows a warning message if you turn on the caps lock and type the password.

This is a simple frontend utility to help the file-upload process on your website. It is written in pure JavaScript, has no dependencies. You can check out the live demo. For the most part, browsers do a good job of handling image uploads. That being said – we find that the ability to show our users a preview of their upload can go a long way in increasing the confidence in their upload.

Table of Contents


  1. Light Weight.
  2. Pure JavaScript.
  3. Cross Browser.

How To Detect If Caps Lock Is On Using Pure JavaScript?

There are a few easy and understandable steps to achieve your desired functionality using pure Vanilla JavaScript that we are gonna share below. Follow each step perfectly.


const capslockIsOn = event.getModifierState(modifier);

Example HTML:

<input type="password" name="password" id="password" placeholder="Enter a password"> <div class="message"></div>

Example JavaScript:

const password = document.querySelector('#password'); 
const message = document.querySelector('.message'); 
password.addEventListener('keyup', function (e) { 
if (e.getModifierState('CapsLock')) { 
    message.textContent = 'Caps lock is on'; 
} else { 
    message.textContent = ''; 


No need to customize it. Just copy-paste. Rest edit the code as per comments and need.

Troubleshooting the Errors

Do it with concentration and patience. Check your alls steps and again and all codes or scripts. If you find any error you can contact us anytime via comment or better via email, We are always here to help you.

Final Words:

That’s all we have. We hope that you liked this article. If you have any problem with this code in your template then feel free to contact us with a full explanation of your problem. We will reply to you as time allows us or If you have any doubts and problems please comment below. We are happy to help you! If you liked this article, Don’t forget to share this with your friends so they can also take benefit from it and leave your precious feedback in our comment form below. Happy development, See you in the next article.

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