Expo Router (SDK 54+) includes built-in middleware support via a `+middleware.ts` file placed in the app folder. This middleware runs custom code before requests reach API routes, making it useful for authentication, logging, and other server-side logic. A matcher option lets you scope middleware to specific routes like API endpoints only. A simple auth example demonstrates extracting a secret from the request and validating it against an environment variable to block unauthenticated requests.

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