check it is installed on your computer or use mongodb server such as mlab
MongoDB Community Server has free download - see sidebar (Download Center:Community Server) or
https://www.mongodb.com/download-center/community
Following Tutorial will be followed see sidebar(Node Server) or
https://www.codementor.io/olatundegaruba/nodejs-restful-apis-in-10-minutes-q0sgsfhbd
Getting Started Section:
see side or:
http://cewit.org/conferenece2019