Getting Started with SvelteKit

Introduction

SvelteKit is a full-stack framework built on top of Svelte that makes it easy to build fast, modern web applications. It handles routing, server-side rendering, API routes, and much more out of the box.

Setting Up a Project

To create a new SvelteKit project, run:

npx sv create my-app
cd my-app
bun install
bun dev

File-Based Routing

SvelteKit uses a file-based routing system. Every +page.svelte file inside src/routes becomes a page:

src/routes/
  +page.svelte        → /
  about/
    +page.svelte      → /about
  blog/
    +page.svelte      → /blog
    [slug]/
      +page.svelte    → /blog/:slug

Server-Side Rendering

SvelteKit renders pages on the server by default. You can load data server-side using +page.server.ts:

import type { PageServerLoad } from './$types';

export const load: PageServerLoad = async ({ params }) => {
  const post = await fetchPost(params.slug);
  return { post };
};

API Routes

Create API endpoints using +server.ts files:

import { json } from '@sveltejs/kit';
import type { RequestHandler } from './$types';

export const GET: RequestHandler = async ({ url }) => {
  const data = await fetchSomeData();
  return json(data);
};

Conclusion

SvelteKit is one of the most enjoyable full-stack frameworks available today. Its tight integration with Svelte's reactivity model, combined with powerful server-side features, makes it an excellent choice for building modern web applications.