Error handling in load in Svelte - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the load function in SvelteKit?

The load function fetches data before a page or component renders, allowing you to prepare data or handle errors early.

beginner

How can you handle errors inside the load function in SvelteKit?

You can throw an Error or use the error() helper to send an error status and message, which SvelteKit catches to show error pages.

beginner

What happens if you throw an error inside the load function?

SvelteKit stops loading the page and shows the error page with the status and message you provided.

intermediate

How do you use the error() helper in the load function?

Call throw error(statusCode, message) inside load to send a specific HTTP status and message for the error page.

beginner

Why is error handling in load important for user experience?

It lets you show friendly messages or fallback content instead of broken pages, keeping users informed and the app stable.

What does the load function in SvelteKit primarily do?

A Manage routing between pages

B Handle user input events

C Style components dynamically

D Fetch data before rendering a page

The load function is used to fetch or prepare data before the page renders.

How do you signal an error inside the load function?

A Return null from <code>load</code>

B Throw an error using <code>throw error(status, message)</code>

C Use <code>console.log</code> to print the error

D Call <code>setTimeout</code> with an error

Throwing an error with throw error(status, message) tells SvelteKit to show an error page.

What happens if you don't handle errors in load?

A The page may break or show incomplete data

B The app automatically retries loading

C The error is ignored silently

D The page redirects to home

Without error handling, the page can break or show wrong content, hurting user experience.

Which helper function is used to create HTTP errors in load?

A error()

B fetch()

C redirect()

D json()

The error() helper creates HTTP errors with status codes and messages.

Why should you handle errors in load instead of inside the component?

A Because errors in components crash the browser

B Because components cannot show errors

C Because <code>load</code> runs before rendering and can stop broken pages early

D Because <code>load</code> is faster than components

Handling errors in load stops broken pages before rendering, improving stability.

Explain how to handle errors inside the load function in SvelteKit and why it matters.

Think about how you tell SvelteKit to show an error page from load.

Describe what happens when an error is thrown inside the load function.

Focus on the flow after throwing an error in load.