In what scenarios would you implement custom middleware instead of using built-in middleware in Express.js?

  • Custom middleware should always be avoided, and built-in middleware should be used.
  • Custom middleware is necessary when working with database connections.
  • Custom middleware should be used when you need to perform application-specific logic that isn't covered by built-in middleware.
  • Custom middleware is used only for unit testing purposes.
Custom middleware is implemented in Express.js when you have specific application logic that cannot be handled by built-in middleware. Common scenarios include authentication, request logging, data validation, and handling application-specific errors. Built-in middleware covers common use cases, but custom middleware allows you to tailor the middleware pipeline to your application's unique needs.
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