The handle() Hook: Middleware for Requests
Intercept every incoming request, modify event.locals, and call resolve().
The handle() Hook: Middleware for Requests is a free Sveltejs Academy lesson on CoddyKit — lesson 1 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.
Server Hooks
Hooks live in src/hooks.server.js. They run on every server request.
Export handle
Export an async function named handle that receives { event, resolve }.
export async function handle({ event, resolve }) {
// do stuff before
const res = await resolve(event);
// do stuff after
return res;
}Modify Event
Set event.locals to expose data to load and endpoints.
event.locals.user = await getUser(event.cookies.get("sid"));Inspect or Replace Response
After resolve(event), you can inspect or modify the response.
Logging Requests
A handle hook is a great place to add request logging or timing metrics.
Authentication Layer
Read cookies, fetch the user, attach to locals. Pages and APIs can then trust locals.
Composing Hooks
Multiple concerns can be wrapped in helpers and combined with sequence().
CORS Headers
Add CORS headers on the way out for APIs that serve other origins.
Performance
Hooks run on every request. Keep them fast and async-safe.
Skipping Static Assets
SvelteKit skips hooks for static files. Your hook only runs for app routes.
TypeScript
Use Handle type from @sveltejs/kit for typed implementations.
Quick Check
Where do server hooks live?
Recap
The handle hook in hooks.server.js intercepts every request. Populate locals for downstream code.
Frequently asked questions
Is the “The handle() Hook: Middleware for Requests” lesson free?
Yes — the full text of “The handle() Hook: Middleware for Requests” 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 “The handle() Hook: Middleware for Requests”?
Intercept every incoming request, modify event.locals, and call resolve(). 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 1 of 4, so you can start here or from the beginning and move at your own pace.
How long does the “The handle() Hook: Middleware for Requests” 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
- The handle() Hook: Middleware for Requests
- handleError for Server Error Logging
- The init() Hook
- Sequence() for Composing Hooks