req.app This property holds a reference to the instance of the Express application that is using the middleware. If

req.method Contains a string corresponding to the HTTP method of the request: GET, POST, PUT, and so

req.protocol Contains the request protocol string: either http or (for TLS requests) https. When

req.accepts(types) Checks if the specified content types are acceptable, based on the request’s Accept HTTP header field. The method

req.secure A Boolean property that is true if a TLS connection is established. Equivalent to:

req.xhr A Boolean property that is true if the request’s X-Requested-With header field is “XMLHttpRequest”, indicating

req.params This property is an object containing properties mapped to the named route “parameters”. For example, if you have the route

req.hostname Contains the hostname derived from the Host HTTP header. When the trust proxy

req.get(field) Returns the specified HTTP request header field (case-insensitive match). The Referrer and Referer

req.stale Indicates whether the request is “stale,” and is the opposite of req.fresh. For more information, see