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clerkMiddleware()

The clerkMiddleware() helper integrates Clerk authentication into your TanStack Start application through middleware.

Configure clerkMiddleware()

Create a src/start.ts file and add clerkMiddleware() to the requestMiddleware array.

src/start.ts
import { clerkMiddleware } from '@clerk/tanstack-react-start/server'
import { createStart } from '@tanstack/react-start'

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

clerkMiddleware() options

The clerkMiddleware() function accepts an optional object. The following options are available:

  • Name
    audience?
    Type
    string | string[]
    Description

    A string or list of audiences. If passed, it is checked against the aud claim in the token.

  • Name
    authorizedParties?
    Type
    string[]
    Description

    An allowlist of origins to verify against, to protect your application from the subdomain cookie leaking attack. For example: ['http://localhost:3000', 'https://example.com']

  • Name
    clockSkewInMs?
    Type
    number
    Description

    Specifies the allowed time difference (in milliseconds) between the Clerk server (which generates the token) and the clock of the user's application server when validating a token. Defaults to 5000 ms (5 seconds).

  • Name
    domain?
    Type
    string
    Description

    The domain used for satellites to inform Clerk where this application is deployed.

  • Name
    isSatellite?
    Type
    boolean
    Description

    When using Clerk's satellite feature, this should be set to true for secondary domains.

  • Name
    jwtKey
    Type
    string
    Description

    Used to verify the session token in a networkless manner. Supply the JWKS Public Key from the API keys page in the Clerk Dashboard. It's recommended to use the environment variable instead. For more information, refer to Manual JWT verification.

  • Name
    organizationSyncOptions?
    Type
    OrganizationSyncOptions | undefined
    Description

    Used to activate a specific organization or personal account based on URL path parameters. If there's a mismatch between the in the session (e.g., as reported by ) and the organization indicated by the URL, the middleware will attempt to activate the organization specified in the URL.

  • Name
    proxyUrl?
    Type
    string
    Description

    Specify the URL of the proxy, if using a proxy.

  • Name
    signInUrl
    Type
    string
    Description

    The full URL or path to your sign-in page. Needs to point to your primary application on the client-side. Required for a satellite application in a development instance. It's recommended to use the environment variable instead.

  • Name
    signUpUrl
    Type
    string
    Description

    The full URL or path to your sign-up page. Needs to point to your primary application on the client-side. Required for a satellite application in a development instance. It's recommended to use the environment variable instead.

  • Name
    publishableKey
    Type
    string
    Description

    The Clerk Publishable Key for your instance. This can be found on the API keys page in the Clerk Dashboard.

  • Name
    secretKey?
    Type
    string
    Description

    The Clerk Secret Key for your instance. This can be found on the API keys page in the Clerk Dashboard. The CLERK_ENCRYPTION_KEY environment variable must be set when providing secretKey as an option, refer to Dynamic keys.

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