Three different ready-to-go implementations are available:
Components Of MEAN :
: M - MongoDB - a NoSQL database
: E - Express - a web application framework that runs on Node.js
: A - AngularJS
: N - Node.js - an execution environment for event-driven server-side and networking applications
MongoDB is a free and open-source cross-platform document-oriented database program. Classified as a NoSQL database program, MongoDB uses JSON-like documents with schemas. MongoDB is free and open-source.
Express (Express.js) :
Express.js, is a web application framework for Node.js, free and open-source software. It is designed for building web applications and APIs.It is the de facto standard server framework for Node.js. It is relatively minimal with many features available as plugins. Express is the backend part of the MEAN stack, together with MongoDB database and AngularJS frontend framework. It provides the MEAN app boilerplate to start on with.
AngularJS (Angular.js) :
Node.js has an event-driven architecture capable of asynchronous I/O. These design choices aim to optimize throughput and scalability in Web applications with many input/output operations, as well as for real-time Web applications (e.g., real-time communication programs and browser games).