MERN stands for MongoDB, ExpressJS, ReactJS, and NodeJS, which is a web development framework. Here are basic components in developing a web application when using MERN:
MongoDB: A document-oriented, No-SQL database used to store the application data.
NodeJS: The JavaScript runtime environment. It is used to run JavaScript on a machine rather than in a browser.
ExpressJS: A framework layered on top of NodeJS, used to build the backend of a site using NodeJS functions and structures. Since NodeJS was not developed to make websites but rather run JavaScript on a machine, ExpressJS was developed.
ReactJS: Facebook created this library. It is used to build UI components that create the user interface of the single page web application.
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