Built-in 404 Error in NextJS

Let's say a user entered a URL in the browser's address bar that does not exist on our website. In this case, we must show them an error page.

In addition, we must return an HTTP status with the code 404 - this is important for SEO, so that search engines that followed a broken link understand that such a page does not exist.

In NextJS, this is done automatically. Try it! Enter a non-existent address and you will see an error page. If you open the browser's debugger and open the Network tab, you will see the 404 response status.