Day: November 17, 2023

Improving 404 Error Handling in JavaScript

404 Error Handling in JavaScript

When you encounter a 404 error, it means that the page you are trying to reach has been deleted or moved. This can cause a frustrating experience for website visitors.

Fortunately, there are several ways to fix the problem. You can try clearing your browser’s cache and cookies, using a different device, or reporting the problem to the website owner.

Fetch API

Fetch API is a powerful and flexible tool for making API requests in JavaScript. It provides a more modern and intuitive interface than the traditional XMLHttpRequest. It is also faster and more scalable. It is not yet fully supported by all browsers, but polyfills are available to ensure compatibility.

A basic fetch request is really simple: it takes a path to a resource and returns a promise that resolves as soon as the server responds with headers. We can then use that promise to check HTTP status and parse the response. Then we can handle any errors that occur. This makes it easy to create complex web applications that use many requests.


When you receive a 404 error, it means that although the server is accessible, the page you are looking for does not exist. This may be because the page has been moved or deleted, or it may be a broken link.

404 errors can negatively impact SEO and search engine rankings, as well as visitors’ experience. However, it is possible to fix 404 errors by checking DNS settings, updating file permissions, disabling the.htaccess code, and restoring a backup.

It is also important to provide a creative 404 error message that will encourage visitors to return to your site. This will prevent them from leaving immediately after seeing a 404 error.


The POST method of HTTP allows a request to contain an arbitrary amount of data in the message body. This is especially useful for requests that change the state of the application, such as submitting a comment or voting in an online poll. Unlike the idempotent operation of GET, POST is not guaranteed to have no side effects, so it is more suitable for changes that may need to be undone. If you use the POST method for an external API call, make sure to increase the logging level in Service Center (Detail page, Integration Log) to ensure that 404 errors are captured and reported back to the requester.


PUT can be used to update a resource that is already located at a URL (or create a new one). It is meant to be idempotent. For example, if you PUT a user with ID 123, then it will update that user to the same state the second time.

The first step in diagnosing a 404 error is to make sure you have a backup of your application and server logs. This way, you can use them to recreate the 404 error and determine how it happened. Also, make sure you make a backup of your database so that you can recover it if necessary.


If you’re experiencing the 404 error not found issue on your website, it may be a sign that your server can’t find the requested page. This can be caused by a mistyped URL, a broken link that was not fixed or moved, or even a problem with your DNS settings.

It seems like a minor point but there is actually quite a bit of debate over whether to return 200 or 404 when using the DELETE API. One argument is that since DELETE is idempotent (it will never fail), it should always return 200 instead of 404. However, there are also reasons to return 404, especially when it comes to errors.


Error 404 is one of the most common problems website owners face. This error usually indicates that the page you are trying to access doesn’t exist on your server. It can also indicate a problem with DNS settings or misconfigured file permissions.

To handle 404 errors, you can create custom error pages. For example, you can create a page that displays messages based on the index of the requested URL. If the index is invalid, you can use a try… except clause to catch an IndexError exception and abort the request. Then, you can respond with a 404 error message. This will help reduce the number of 404 errors and improve user experience.

Lead yourself back to the main page