Mastering Custom Error Pages in SvelteKit

The SvelteKit error pages tutorial teaches developers how to handle errors gracefully in their applications by creating custom error pages. This enhances user experience by providing clear information about what went wrong.

Key Concepts

• Error Handling in SvelteKit: SvelteKit allows you to create custom error pages for various HTTP status codes (like 404 for "Not Found" or 500 for "Server Error").
• Error Pages Structure: You can create a dedicated error page by placing a +error.svelte file in your routes directory. This file can be customized to display user-friendly messages.
• Error Handling Mechanism:
  • SvelteKit automatically catches errors in your application and displays the corresponding error page.
  • You can also manually throw errors in your routes to trigger the error handling mechanism.

Creating a Custom Error Page

1. Customization: You can customize the layout, message, and style of the error page to match your application's design.

File Creation: Create a file named +error.svelte in your route folder.

<script>
  export let status; // HTTP status code
  export let error;  // Error object
</script>

<h1>{status}</h1>
<p>{error.message}</p>

Example Usage

• 404 Error Example: If a user navigates to a non-existent route, SvelteKit will display the +error.svelte page with a 404 status.

Triggering an Error: You can manually throw an error in your route:

throw new Error('Something went wrong!');

This will redirect the user to the custom error page with a 500 status.

Benefits of Custom Error Pages

• Improved User Experience: Users receive helpful information rather than a generic error message.
• Branding Consistency: Custom error pages can reflect your brand's style and tone.
• Guidance: You can provide links back to the home page or other sections of your site to help users navigate.

By implementing custom error pages in SvelteKit, developers can create a more robust and user-friendly application that handles errors effectively.