What is middleware in Express, and how can it be used for authentication or logging?
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In Express.js, middleware is a function that has access to the request (req), response (res), and the next middleware function in the application’s request-response cycle. Middleware functions can execute code, modify the request or response, end the request, or pass control to the next middleware using next().
Role of Middleware in Express:
Middleware is essential for handling common tasks such as:
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Authentication
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Logging
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Error handling
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Request parsing
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Serving static files
Using Middleware for Authentication:
You can create a custom middleware to verify tokens or credentials:
Using Middleware for Logging:
Log each request’s method and URL:
Summary:
Middleware in Express allows for modular, reusable handling of common web app concerns. For authentication, it checks credentials before granting access; for logging, it tracks requests—making your app more secure, maintainable, and debuggable.
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