Express Middleware

Middleware functions in Express sit between the incoming request and the final route handler, allowing developers to process, modify, or validate requests along the way.

How Middleware Works

Each middleware function has access to the request, response, and a next function, which passes control to the next middleware in the chain.

Common Use Cases

Middleware is commonly used for logging, parsing request bodies, handling authentication, and managing errors across an application.

Custom Middleware

Developers can write custom middleware to handle application-specific logic, giving fine-grained control over the request-response cycle.