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ER is a high level conceptual data base diagram.ER modeling helps us to create well designed data base with systematic analyzement. Thats why it is very important to practice er diagram before create a database. Actually ER Diagram explains the logical structure of database.Even though ER diagram is similar to the flowchart it become unique because of its symbols and conceptual based exposes.

Now a days all web based application has some database to store the data at the back end. Nodejs frame work have the ability to work with both relational and non relational database. Node.js  MongoDB   NoSQL database mongodb quite fame because of its ability to store the any sort of data at any format.In order work we have to download required module.Mongodb required the module to be installed is mongoose.And also with these modules we can perform many operations.Before that we have to get start mongodb in nodejs. 1.Install MongoDB Driver * We can download from official mongodb driver or open in terminal and execute it     npm install mongodb * Node.js used this module to manipulate mongodb database.   var  mongo = require( 'mongodb' ); 2.Node.js  MongoDB  Create Database To create a database: 1.Create the Mongoclient object 2.Specify the url connection (correct ip address and name of the database want...