Middleware Patterns

Overview

Middleware is code that runs between receiving a request and sending a response. It's the backbone of request processing in web applications.

What is Middleware?

THE MIDDLEWARE CONCEPT:

REQUEST → [Middleware 1] → [Middleware 2] → [Middleware N] → HANDLER → RESPONSE
              ↓                 ↓                 ↓              ↓
          (logging)         (auth)           (parse)       (business logic)


MIDDLEWARE CAN:
├── Modify the request before it reaches the handler
├── Modify the response before it's sent