Express JS

Is a javascript framework that allows for a javascript application to handle http requests. A node app, for instance, can be setup to handle url resource requests. For example a GET request to “/cats” could be handled by the node app to query a database for all the cats it contains and then returned as a JSON dictionary. By extension it can also handle variable urls where a part of the resource path can be an input for the request. A GET request to “/cats/felix” can be handled by querying the cats database for a cat named “felix” and then returning that data.

Express allows for quick and simple implementations of a backend web application.