Error Pages in Nested Layouts
Scope error boundaries to sections of the app using layout-level error pages.
Error Pages in Nested Layouts is a free Sveltejs Academy lesson on CoddyKit — lesson 4 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Sveltejs Academy learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.
Error Boundaries Per Folder
Each +layout.svelte folder can have its own +error.svelte to catch errors locally.
Scoping Failures
An error in an admin route can show an admin-styled error page without breaking the whole site.
Closest Wins
SvelteKit finds the nearest +error.svelte up the layout chain to render.
Reset Pattern
Place an error page inside a layout to allow recovery: clicking a link can leave the error and continue.
Marketing vs App
Marketing pages might show friendly errors; app pages may show technical details.
Section Defaults
If no nested error page exists, the root one takes over.
Tailoring Status Pages
404 vs 500 vs 401 can have different layouts and CTAs per section.
Per-Group Errors
Layout groups (group) can also host their own error pages.
Always Have a Root
Always provide src/routes/+error.svelte as the final fallback.
Combine With handleError
handleError logs everywhere; error pages display. Use both together.
Production Polish
Custom error pages signal quality. Spend the time on great messages and recovery options.
Quick Check
Where does SvelteKit look for an error page?
Recap
Scope error UI by placing +error.svelte in subfolders. SvelteKit picks the nearest one to the error.
Frequently asked questions
Is the “Error Pages in Nested Layouts” lesson free?
Yes — the full text of “Error Pages in Nested Layouts” is free to read here on the web, and the Sveltejs Academy course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Sveltejs Academy course, upgrade to CoddyKit PRO.
What will I learn in “Error Pages in Nested Layouts”?
Scope error boundaries to sections of the app using layout-level error pages. You practise Sveltejs Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Sveltejs Academy?
No prior experience is required. Sveltejs Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 4 of 4, so you can start here or from the beginning and move at your own pace.
How long does the “Error Pages in Nested Layouts” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Sveltejs Academy lesson?
Yes. Every Sveltejs Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- +error.svelte for Custom Error Pages
- Expected vs Unexpected Errors
- error() and redirect() Helpers
- Error Pages in Nested Layouts