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Sveltejs Academy · Lesson

+server.js: GET POST PUT DELETE

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

+server.js: GET POST PUT DELETE 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.

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?

Recap

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

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, 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 “+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; 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 “+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?

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

  1. +server.js: GET POST PUT DELETE
  2. Request and RequestEvent
  3. Returning JSON Responses
  4. Streaming with ReadableStream
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