Custom errors help you create more meaningful error messages that describe exactly what went wrong. They make debugging easier and your code more reliable, especially in large applications. In this article, we’ll guide you through creating, throwing, and handling custom errors in JavaScript using the throw statement and the Error object.

1. Include the library script ‘Toast.js’ on the webpage. 2. You need a container element where the toasts will appear. 3. Create a simple toast notification with the following code: context: Target container. message: The text content of the toast.

JavaScript allows to use throw with any argument, so technically our custom error classes don’t need to inherit from Error. But if we inherit, then it becomes possible to use obj instanceof Error to identify error objects. So it’s better to inherit from it. As the application grows, our own errors naturally form a hierarchy.

Balancing the handling of 404 errors with Toastr validation notifications can be challenging, especially if your goal is to have separate 404 pages for admin and website areas. This setup calls for selectively displaying Toastr alerts only when validation issues occur and not when users encounter a 404 page.