Sveltejs Academy · Lesson

+server.js: GET POST PUT DELETE

Export handler functions named after HTTP methods to build API endpoints.

Lesson 1 of 413 steps

+server.js: GET POST PUT DELETE is a free Sveltejs Academy lesson on CoddyKit. This is 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, and your progress syncs across the web and the CoddyKit app. The Sveltejs Academy course includes 4 lessons in total.

API Routes

SvelteKit lets you build API endpoints inside the same project with +server.js files.

Location

Place +server.js in any folder under src/routes. The folder defines the URL.

src/routes/api/items/+server.js  -> /api/items

HTTP Method Exports

Export a function named after the HTTP method.

export async function GET() {
  return new Response("hello");
}

Multiple Methods

One file can export GET, POST, PUT, DELETE, PATCH, OPTIONS, HEAD.

Returning Responses

Each handler returns a standard Response object.

export async function POST({ request }) {
  const data = await request.json();
  return new Response(JSON.stringify({ ok: true }), { headers: { "content-type": "application/json" } });
}

json Helper

The json() helper from @sveltejs/kit sets headers for you.

import { json } from "@sveltejs/kit";
return json({ items: [] });

Method Not Allowed

Unhandled methods return 405 automatically. No boilerplate needed.

Param-Driven Endpoints

Use dynamic folder names like [id] for resource-style routes.

src/routes/api/items/[id]/+server.js

Authentication

Check event.locals (populated by hooks) for auth state.

Status Codes

Pass status as the second argument to json or set on Response init.

return json({ ok: false }, { status: 400 });

CORS

If your API serves cross-origin requests, add CORS headers manually or via a hook.

Quick Check

How do you handle GET?

Answer it in the interactive lesson

Recap

+server.js exports per-method handlers (GET, POST, etc.) returning Response or using the json() helper.

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Frequently Asked Questions

Is the “+server.js: GET POST PUT DELETE” lesson free?

Yes — the full text of “+server.js: GET POST PUT DELETE” is free to read here on the web. 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. The Sveltejs Academy course includes 4 lessons in total.

What will I learn in “+server.js: GET POST PUT DELETE”?

Export handler functions named after HTTP methods to build API endpoints. 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, so you can start here or from the beginning and move at your own pace. This is lesson 1 of 4.

How long does the “+server.js: GET POST PUT DELETE” 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?

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