Does middleware order matter in Express?
Yes. Express runs middlewares in the order you add them. Add global ones (json, cors, helmet, compression) first, then routers, then the error-handling middleware last. Wrong order causes bugs (e.g., body parser after routes means req.body is undefined).
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More FAQs in Express Middlewares Every Server Needs
express.json, express.urlencoded, cors, helmet, a logger (morgan or pino-http), express-rate-limit, cookie-parser (if using cookies), compression, a custom auth middleware, a validation middleware, and an error-handling middleware.
It sets security HTTP headers (X-Frame-Options, Strict-Transport-Security, Content-Security-Policy basics) that protect against clickjacking, sniffing, and other common attacks. Set it and forget it.
Limits requests per IP to prevent abuse and brute-force attacks. Add a global limiter (e.g., 100 req per 15 min) and stricter limiters on auth routes (5 login attempts per 15 min). It is a small addition with big protection.
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