start-core/middleware

To configure middleware in TanStack Start, use createMiddleware and createStart to define server and client pipelines with deterministic execution order and context passing.

Middleware execution order in TanStack Start is deterministic, enforced by API method ordering during composition. This ensures global and route-specific middleware apply predictably across both SSR and server routes.

Yes, TanStack Start middleware applies to both SSR and server routes. The framework supports composing middleware across server and client phases, ensuring context passing and fetch customization throughout the request lifecycle.

Yes, you need TypeScript to set up middleware with TanStack Start. This Skill requires TypeScript-enabled projects to properly configure and compose middleware using createMiddleware with enforced method order and context passing.

Pass context across server functions by composing middleware with createMiddleware in TanStack Start. The framework handles context passing automatically across the request pipeline, allowing customized fetch behavior for both server and client phases.