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TanStack · Function

createServerFn

createServerFn defines server-only logic that application code can call through a typed RPC boundary. It supports validation, serialization, errors, redirects, forms, and server-side capabilities such as database access.

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Syntax

createServerFn(options?).validator(validator).handler(async ({ data }) => result)

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  • useServerFn()
  • validator()
  • handler()
  • createCsrfMiddleware()
  • server routes
  • middleware
  • redirect()
  • notFound()

Source: Server Functions | TanStack Start React Docs. Checked 2026-11-03.