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Recall the function signature of an Express middleware, i.e., (req, res, next)
. You might recognize this signature as being the very same that we’ve used for Express routes in the past. Well there’s a perfectly good reason for that: Express routes are middleware. Every route created in Express is also a middleware function handling the request and response objects at that part of the stack. Express routes also have the option of sending a response body and status code and closing the connection. These two features are a byproduct of Express routes being middleware, because all Express middleware functions have access to the request, the response, and the next middleware in the stack.
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