What is void(0) in JavaScript?

When you're working on a website or using JavaScript in general, you might have come across something like this:

JAVASCRIPT
javascript:void(0);

In this post, we'll learn what void(0) means so the next time you see it, you'll understand what it means.

What is void(0)?

void(0) is a JavaScript expression that evaluates to undefined.

It's used to evaluate an expression without returning a value. It's also used to prevent the default action of an element.

This operator is mostly used in the href attribute of an anchor tag.

It's used to prevent the browser from following the link. It's also used to prevent the browser from following the link when the link is clicked.

Let's look an example where you might see this:

HTML
<a href="javascript:void(0);">Click me</a>

When you click on that link, nothing will happen.

This is useful for when you want to create a link for SEO purpose, but not have it lead to a page.

On the other hand, here is an anchor link with an alert function instead of void(0).

The browser will execute the code since it's not void(0).

HTML
<a href="javascript:alert('Hello World!');">Click me</a>

When you click on that link, it will show an alert with the text "Hello World!".

Conclusion

In this post, we learned what void(0) means and how it's used.

If you want a link to essentially do nothing, you can use void(0) with the javascript: protocol.

Thanks for reading!

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