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clerk-tanstack-patterns

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Aktualisiert24. Juni 2026 um 18:09

TanStack React Start auth patterns with @clerk/tanstack-react-start - createServerFn, beforeLoad guards, loaders, Vinxi server. Triggers on: TanStack auth, createServerFn clerk, beforeLoad protection, TanStack Start middleware.

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gannonh

gannonh/kata-code

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SKILL.md

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name	clerk-tanstack-patterns
description	TanStack React Start auth patterns with @clerk/tanstack-react-start - createServerFn, beforeLoad guards, loaders, Vinxi server. Triggers on: TanStack auth, createServerFn clerk, beforeLoad protection, TanStack Start middleware.
license	MIT
allowed-tools	WebFetch
metadata	{"author":"clerk","version":"1.0.0"}

TanStack React Start Patterns

What Do You Need?

Task	Reference
Protect routes with beforeLoad	references/router-guards.md
Auth in createServerFn	references/server-functions.md
Pass auth to loaders	references/loaders.md
Configure Vinxi + clerkMiddleware	references/vinxi-server.md

References

Reference	Description
`references/router-guards.md`	beforeLoad auth redirect
`references/server-functions.md`	createServerFn with auth()
`references/loaders.md`	Auth context in loaders
`references/vinxi-server.md`	clerkMiddleware() setup

Setup

npm install @clerk/tanstack-react-start

.env:

CLERK_PUBLISHABLE_KEY=pk_...
CLERK_SECRET_KEY=sk_...

src/start.ts (Vinxi entry):

import { clerkMiddleware } from "@clerk/tanstack-react-start/server";
import { createStart } from "@tanstack/react-start";

export const startInstance = createStart(() => {
  return {
    requestMiddleware: [clerkMiddleware()],
  };
});

src/routes/__root.tsx — wrap with <ClerkProvider>:

import { ClerkProvider } from "@clerk/tanstack-react-start";

function RootDocument({ children }: { children: React.ReactNode }) {
  return (
    <html lang="en">
      <body>
        <ClerkProvider>{children}</ClerkProvider>
      </body>
    </html>
  );
}

Mental Model

TanStack Start runs on Vinxi. Auth flows through two layers:

Server layer — createServerFn + auth() from @clerk/tanstack-react-start/server
Router layer — beforeLoad on route definitions, throws redirect for unauthenticated

Both layers are server-executed. Client hooks (useAuth, useUser) are React hooks for the browser side.

Minimal Pattern

import { createFileRoute, redirect } from "@tanstack/react-router";
import { createServerFn } from "@tanstack/react-start";
import { auth } from "@clerk/tanstack-react-start/server";

const authStateFn = createServerFn().handler(async () => {
  const { isAuthenticated, userId } = await auth();
  if (!isAuthenticated) {
    throw redirect({ to: "/sign-in" });
  }
  return { userId };
});

export const Route = createFileRoute("/dashboard")({
  beforeLoad: async () => await authStateFn(),
});

Common Pitfalls

Symptom	Cause	Fix
`auth()` returns empty	Missing `clerkMiddleware` in start.ts	Add to `requestMiddleware` array
`redirect` not thrown	Using `return` instead of `throw`	`throw redirect(...)` in TanStack
Wrong import for `auth`	Mixing client/server imports	Server: `@clerk/tanstack-react-start/server`
Loader context missing userId	Not passing from beforeLoad	Return from beforeLoad, access via `context`
`ClerkProvider` missing	Forgot root wrapping	Add to `__root.tsx` shell component

Docs

TanStack React Start SDK

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name	clerk-tanstack-patterns
description	TanStack React Start auth patterns with @clerk/tanstack-react-start - createServerFn, beforeLoad guards, loaders, Vinxi server. Triggers on: TanStack auth, createServerFn clerk, beforeLoad protection, TanStack Start middleware.
license	MIT
allowed-tools	WebFetch
metadata	{"author":"clerk","version":"1.0.0"}

TanStack React Start Patterns

What Do You Need?

Task	Reference
Protect routes with beforeLoad	references/router-guards.md
Auth in createServerFn	references/server-functions.md
Pass auth to loaders	references/loaders.md
Configure Vinxi + clerkMiddleware	references/vinxi-server.md

References

Reference	Description
`references/router-guards.md`	beforeLoad auth redirect
`references/server-functions.md`	createServerFn with auth()
`references/loaders.md`	Auth context in loaders
`references/vinxi-server.md`	clerkMiddleware() setup

Setup

npm install @clerk/tanstack-react-start

.env:

CLERK_PUBLISHABLE_KEY=pk_...
CLERK_SECRET_KEY=sk_...

src/start.ts (Vinxi entry):

import { clerkMiddleware } from "@clerk/tanstack-react-start/server";
import { createStart } from "@tanstack/react-start";

export const startInstance = createStart(() => {
  return {
    requestMiddleware: [clerkMiddleware()],
  };
});

src/routes/__root.tsx — wrap with <ClerkProvider>:

import { ClerkProvider } from "@clerk/tanstack-react-start";

function RootDocument({ children }: { children: React.ReactNode }) {
  return (
    <html lang="en">
      <body>
        <ClerkProvider>{children}</ClerkProvider>
      </body>
    </html>
  );
}

Mental Model

TanStack Start runs on Vinxi. Auth flows through two layers:

Server layer — createServerFn + auth() from @clerk/tanstack-react-start/server
Router layer — beforeLoad on route definitions, throws redirect for unauthenticated

Both layers are server-executed. Client hooks (useAuth, useUser) are React hooks for the browser side.

Minimal Pattern

import { createFileRoute, redirect } from "@tanstack/react-router";
import { createServerFn } from "@tanstack/react-start";
import { auth } from "@clerk/tanstack-react-start/server";

const authStateFn = createServerFn().handler(async () => {
  const { isAuthenticated, userId } = await auth();
  if (!isAuthenticated) {
    throw redirect({ to: "/sign-in" });
  }
  return { userId };
});

export const Route = createFileRoute("/dashboard")({
  beforeLoad: async () => await authStateFn(),
});

Common Pitfalls

Symptom	Cause	Fix
`auth()` returns empty	Missing `clerkMiddleware` in start.ts	Add to `requestMiddleware` array
`redirect` not thrown	Using `return` instead of `throw`	`throw redirect(...)` in TanStack
Wrong import for `auth`	Mixing client/server imports	Server: `@clerk/tanstack-react-start/server`
Loader context missing userId	Not passing from beforeLoad	Return from beforeLoad, access via `context`
`ClerkProvider` missing	Forgot root wrapping	Add to `__root.tsx` shell component

Docs

TanStack React Start SDK

clerk-tanstack-patterns

TanStack React Start Patterns

What Do You Need?

References

Setup

Mental Model

Minimal Pattern

Common Pitfalls

See Also

Docs

TanStack React Start Patterns

What Do You Need?

References

Setup

Mental Model

Minimal Pattern

Common Pitfalls

See Also

Docs