An introduction of MEAN STACK
MongoDB is a free and open-source cross-platform database program. It is been classified as NoSQL database program and it also uses JSON-like documents with schemas. It is useful when the schema-less documents are to be stored. It is very fast and flexible. It is claimed to be strongly consistently and easy to maintain with low cost. Since it is a document database, the access and retrieval of records is different as compared to other databases.
Express JS is a server-side MVC framework in Node JS which is designed for building web application and APIs. it is the backend part of MEAN stack. It provides a minimal interface to build applications. It is flexible and pluggable as compared to Rails and Django. It uses various modules available on NPM (Node Package Manager).
MEAN over LAMP