SvelteKit

Full-stack framework for building web applications with Svelte, combining a file-based router, server routes, and configurable rendering in one integrated setup. Handles the full request lifecycle from routing and data loading through to deployment, so teams can focus on product logic instead of wiring SSR, CSR, and build tooling from scratch.

SvelteKit is backed by Vercel and maintained alongside the Svelte compiler. It positions alongside Next.js and Nuxt in the ecosystem, but differentiates with Svelte's compile-time approach: no virtual DOM, smaller bundles, and reactive bindings without hooks. State of JS and Stack Overflow surveys consistently rank Svelte among the most satisfying frameworks to use. The hybrid default, SSR for first load and CSR for subsequent navigation, balances SEO and perceived performance without framework-specific config.

Key capabilities:

• File-based routing with server routes, API endpoints, and layout nesting
• Configurable rendering per page: SSR, CSR, prerendering, or mixed, with optional edge deployment
• Official adapters for serverless platforms, static hosting, and Node servers, plus community adapters for other targets
• Built on Vite for fast HMR, code splitting, and optimized production builds
• Form actions with progressive enhancement and built-in image optimization
• Service worker support for offline apps and PWAs

Teams use SvelteKit for full-stack SaaS, marketing sites, dashboards, and apps that need strong first-load performance and flexible deployment. It fits projects that want a single codebase for frontend and API, or a SPA frontend talking to an external backend. The adapter model supports deployment to major hosts with minimal config, and the library packaging add-on lets you ship shared Svelte components across apps.