Express Middleware: The Chain of Command for Requests
Source: expressjs.comintermediate
Express middleware is a chain of functions a request passes through. Each function can inspect, modify, or stop the request, useful for logging, auth, or body parsing.
Think of Express middleware as an assembly line for HTTP requests. Each function gets the request (`req`), response (`res`), and a `next` function to pass control. It's used for cross-cutting concerns like logging, parsing JSON bodies, or authentication. The biggest footgun: if a middleware doesn't send a response or call `next()`, the request hangs indefinitely, leaving the client waiting forever.
Read the original → expressjs.com
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