Express Middleware: Intercepting Requests Before Your Route Handler
Express middleware is like a bouncer for your routes, running code before your main handler. Use it for logging, authentication, or parsing request bodies. The biggest footgun is forgetting to call `next()` or send a response, which leaves requests hanging.
Think of Express middleware as a chain of functions processing a request before it reaches its final route handler. Each function gets the request, response, and a `next` callback to pass control. It's used for logging, authentication, or parsing request bodies. The biggest footgun is forgetting to call `next()` when the middleware's job is done. Without it, the request-response cycle stalls, and the client's request will hang until it times out, never reaching your route logic.
Read the original → expressjs.com
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