req.body Contains key-value pairs of data submitted in the request body. By default, it is undefined, and is populated when you

app.listen(port, [hostname], [backlog], [callback]) Binds and listens for connections on the specified host and port. This method is identical

app.post(path, callback [, callback ...]) Routes HTTP POST requests to the specified path with the specified callback functions. For more information

req.baseUrl The URL path on which a router instance was mounted. The req.baseUrl property is similar

req.acceptsLanguages(lang [, ...]) Returns the first accepted language of the specified languages, based on the request’s Accept-Language

Express uses the debug module internally to log information about route matches, middleware

app.mountpath The app.mountpath property contains one or more path patterns on which a sub-app was mounted.

express.static(root, [options]) This is the only built-in middleware function in Express. It serves static files and is based on

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

req.originalUrl req.url is not a native Express property, it is inherited from Node’s