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Start

A full-stack framework for React and Solid.

Build with type-safe routing, server-side rendering, streaming, and server functions, powered by TanStack Router.

Docs

route execution map

server

1beforeLoad
2loader
3component
4stream HTML

browser

1hydrate HTML
2client navigation

Full SSR

Data and markup arrive ready to hydrate.

432.9Mtotal downloads 11,891,439weekly downloads 15,309GitHub stars

Router at the core

The framework does not replace the application model.

Routes, params, search schemas, loaders, links, pending states, and boundaries stay TanStack Router. Start adds the server and build layers around that same tree.

Start server layer

SSR · streaming · server functions · routes · middleware

TanStack Router

route tree · URL state · loaders · links · boundaries

Your application

components · data clients · product behavior

Explicit boundaries

Server work is visible in the code that calls it.

Use server functions for type-safe app calls, server routes for outside callers, and composable middleware for authentication, context, logging, and policy.

server boundary

Typed work called from the app

const getProject = createServerFn({ method: 'GET' })
  .validator(projectSchema)
  .handler(({ data }) => db.projects.find(data.id))

component or loader

validated request

server-only handler

typed result

Portable application model

Keep the routes. Change the output.

Start supports Vite and Rsbuild and is designed for different hosting providers and runtimes. Deployment configuration changes; route authoring and server boundaries do not.

deployment output

selected target

Cloudflare

output: Worker runtime
deploy: wrangler deploy

createFileRoute()

createServerFn()

middleware()

route loaders

The authoring surface stays the same.

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