SvelteKit

What Is SvelteKit?

SvelteKit is the official full-stack application framework for Svelte, providing server-side rendering, file-based routing, and deployment flexibility through an adapter system. Created by Rich Harris and the Svelte team, SvelteKit is the recommended way to build Svelte applications of any complexity.

File-Based Routing

Routes are defined by the directory structure within the src/routes folder. Each route can include a page component, layout, server-side load functions, form actions, and API endpoints. Dynamic routes, optional parameters, rest parameters, and route groups provide flexible URL handling.

Data Loading

Load Functions run on the server or client depending on context, fetching data that components need for rendering. Server load functions can access databases, environment variables, and private APIs without exposing credentials. Universal load functions run on both server and client for shared logic.

Form Actions

Form Actions handle form submissions on the server with progressive enhancement. Forms work without JavaScript and gain enhanced behavior when JavaScript is available. Actions provide input validation, error handling, and redirect capabilities.

Adapter System

SvelteKit's adapter system enables deploying to virtually any platform. Official adapters exist for Node.js, static sites, Cloudflare Pages, Vercel, and Netlify. Community adapters support additional platforms. The same codebase deploys to different targets simply by changing the adapter.

Why Choose SvelteKit

Teams building Svelte applications choose SvelteKit for its integrated routing, server-side rendering, and deployment flexibility. The progressive enhancement philosophy ensures applications work without JavaScript while providing enhanced experiences when available.