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Middleware System

Middleware runs before (and optionally after) your route handlers. Use it for logging, auth, CORS, and other cross-cutting logic. BurgerAPI supports global middleware (all routes) and route-specific middleware.

Execution order​

  1. Global middleware — Runs first, in the order defined in globalMiddleware.
  2. Validation — If the route has a Zod schema, validation runs next.
  3. Route-specific middleware — Runs in the order defined in the route’s middleware array.
  4. Route handler — Your GET, POST, etc. runs last.

If any middleware returns a Response, the chain stops and that response is sent.

For full details and code examples, see Middleware.