Route Middleware

Definitions

1. A function that intercepts an HTTP request before (or after) it reaches the route handler, performing cross-cutting concerns like authentication, logging, rate limiting, or body parsing. Middleware can modify the request/response objects, short-circuit the chain, or pass control to the next middleware via next().

   In plain English: Code that runs automatically before your main request handler, doing things like checking permissions or logging.

   Example: "We added rate-limiting middleware on the /api routes to cap each IP at 100 requests per minute."

Related Terms

• Cookie
• Fetch API
• Stale-While-Revalidate
• Server-Sent Events
• Request Handler
• Route
• Route Handler
• URL Router