SvelteKit - Full-Stack Svelte Framework

Overview

SvelteKit is the official full-stack framework for Svelte, providing file-based routing, server-side rendering (SSR), static site generation (SSG), form handling with progressive enhancement, and deployment adapters for any platform.

Key Features:

• File-based routing: Automatic routes from src/routes/ directory structure
• Load functions: Type-safe data fetching (+page.ts, +page.server.ts)
• Form actions: Native form handling with progressive enhancement
• SSR/SSG/SPA: Flexible rendering modes with per-route control
• Adapters: Deploy to Vercel, Netlify, Node.js, Cloudflare, and more
• TypeScript-first: Generated types from $types for type safety
• Hooks: Middleware-like handle, handleError, handleFetch
• API routes: +server.ts files for REST endpoints

Installation:

# Create new SvelteKit project
npm create svelte@latest my-app
cd my-app
npm install
npm run dev -- --open

# Templates: skeleton, demo app, library
# Choices: TypeScript, ESLint, Prettier, Playwright, Vitest

Project Structure

Standard SvelteKit Layout

my-sveltekit-app/
├── src/
│   ├── routes/                   # File-based routing
│   │   ├── +page.svelte         # / (home page)
│   │   ├── +page.ts             # Universal load function
│   │   ├── +page.server.ts      # Server-only load function
│   │   ├── +layout.svelte       # Shared layout
│   │   ├── +layout.ts           # Layout load function
│   │   ├── +error.svelte        # Error page
│   │   ├── about/
│   │   │   └── +page.svelte     # /about
│   │   ├── blog/
│   │   │   ├── +page.svelte     # /blog (list)
│   │   │   ├── +page.server.ts  # Load posts
│   │   │   └── [slug]/
│   │   │       ├── +page.svelte # /blog/my-post
│   │   │       └── +page.server.ts
│   │   └── api/
│   │       └── posts/
│   │           └── +server.ts   # GET /api/posts
│   ├── lib/
│   │   ├── components/
│   │   ├── server/              # Server-only utilities
│   │   │   └── database.ts
│   │   ├── stores/
│   │   └── utils/
│   ├── hooks.server.ts          # Server hooks
│   ├── hooks.client.ts          # Client hooks
│   ├── app.html                 # HTML template
│   └── app.d.ts                 # TypeScript declarations
├── static/                       # Static assets (robots.txt, favicon)
├── tests/                        # Playwright tests
├── svelte.config.js             # SvelteKit configuration
├── vite.config.ts               # Vite configuration
└── package.json

File-Based Routing

Route Conventions

File naming determines routing:

Basic Routes

src/routes/
├── +page.svelte              # / (home)
├── about/
│   └── +page.svelte          # /about
├── contact/
│   └── +page.svelte          # /contact
└── pricing/
    └── +page.svelte          # /pricing

Dynamic Routes

src/routes/
└── blog/
    ├── +page.svelte          # /blog (list)
    ├── [slug]/
    │   └── +page.svelte      # /blog/my-post
    └── [category]/
        └── [slug]/
            └── +page.svelte  # /blog/tech/my-post

Access route params:

<!-- src/routes/blog/[slug]/+page.svelte -->
<script lang="ts">
  import type { PageData } from './$types';

  let { data } = $props<{ data: PageData }>();
</script>

<article>
  <h1>{data.post.title}</h1>
  <p>{data.post.content}</p>
</article>

Optional Parameters

src/routes/
└── archive/
    └── [[year]]/
        └── [[month]]/
            └── +page.svelte  # /archive, /archive/2024, /archive/2024/11

// src/routes/archive/[[year]]/[[month]]/+page.ts
import type { PageLoad } from './$types';

export const load: PageLoad = async ({ params }) => {
  const year = params.year || new Date().getFullYear();
  const month = params.month || null;

  return {
    year,
    month,
    posts: await fetchPosts({ year, month })
  };
};

Rest Parameters

src/routes/
└── docs/
    └── [...path]/
        └── +page.svelte      # /docs/guide/intro, /docs/api/reference

// src/routes/docs/[...path]/+page.ts
export const load: PageLoad = async ({ params }) => {
  const path = params.path; // "guide/intro"
  const segments = path.split('/'); // ["guide", "intro"]

  return {
    doc: await fetchDoc(path)
  };
};

Load Functions

Universal Load (+page.ts)

Runs on both server and client. Must use fetch for data fetching.

// src/routes/products/+page.ts
import type { PageLoad } from './$types';

export const load: PageLoad = async ({ fetch, params, url }) => {
  const response = await fetch('/api/products');
  const products = await response.json();

  return {
    products,
    searchQuery: url.searchParams.get('q') || ''
  };
};

// Prerendering options
export const prerender = true; // Static generation
export const ssr = false;      // Disable SSR (SPA mode)
export const csr = true;       // Enable client-side rendering

Server-Only Load (+page.server.ts)

Runs only on server. Direct database access allowed.

// src/routes/dashboard/+page.server.ts
import { redirect } from '@sveltejs/kit';
import type { PageServerLoad } from './$types';
import { db } from '$lib/server/database';

export const load: PageServerLoad = async ({ locals, cookies }) => {
  // Check authentication
  if (!locals.user) {
    throw redirect(303, '/login');
  }

  // Direct database query (server-only)
  const stats = await db.query.stats.findFirst({
    where: eq(stats.userId, locals.user.id)
  });

  // Sensitive data stays on server
  const apiKey = process.env.SECRET_API_KEY;
  const data = await fetchPrivateData(apiKey);

  return {
    stats,
    userData: data
  };
};

Streaming with Promises

// src/routes/posts/+page.server.ts
import type { PageServerLoad } from './$types';

export const load: PageServerLoad = async () => {
  return {
    // Immediate data
    featured: await db.posts.findMany({ where: { featured
how to use sveltekit
CursorClaude CodeClineCodexWindsurfGooseGitHub CopilotVS CodeGemini CLIKiloOpencodeKimi CLIRoo ClineAiderContinueZedBolt.newLovablev0Replit AgentSweepSmol DeveloperDevinCavemanAmpAntigravity
How to use sveltekit on Cursor
AI-first code editor with Composer
1
Prerequisites
Before installing skills in Cursor, ensure your development environment meets these requirements:
›Cursor installed and configured on your development machine
›Node.js version 16.0+ with npm package manager (verify with node --version)
›Active project directory or workspace where you want to add sveltekit
2
Execute installation command
Execute the skills CLI command in your project's root directory to begin installation:
$npx skills add https://github.com/bobmatnyc/claude-mpm-skills --skill sveltekitcopy
The skills CLI fetches sveltekit from GitHub repository bobmatnyc/claude-mpm-skills and configures it for Cursor.
3
Select Cursor when prompted
The CLI will show a list of available agents. Use arrow keys to navigate and space to select Cursor:
◆ Which agents do you want to install to?
│
│ ── Universal (.agents/skills) ── always included ────
│   • Amp
│   • Antigravity
│   • Cline
│   • Codex
│ ●Cursor(selected)
│   • Cursor
│   • Windsurf
4
Verify installation
Confirm successful installation by checking the skill directory location:
.cursor/skills/sveltekit
Reload or restart Cursor to activate sveltekit. Access the skill through slash commands (e.g., /sveltekit) or your agent's skill management interface.
⚠
Security & Verification Notice
We perform automated surface-level scans (Gen AI Scanner, Socket, Snyk) during installation. These checks detect common vulnerabilities but do not guarantee complete security. Always review skill source code and verify the publisher's reputation before production use.
Skills execute code in your development environment. Always verify the publisher's identity, review recent commits, and test in isolated environments before production deployment.
Additional Resources
›View source code on GitHub›Skills CLI documentation›Learn more about Cursor›What are agent skills?