Creating a Database

Just as with the MongoDB shell, there is not an explicit method for creating databases. Databases are created automatically whenever a collection or document is added to them. Therefore, to create a new database, all you need to do is use the db() method on the Db object provided by the MongoClient connection to create a new Db object instance. Then you call createCollection() on the new Db object instance to create the database.

The following code shows an example of creating a new database named newDB after connecting to the server:

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var MongoClient = require('mongodb').MongoClient;
MongoClient.connect("mongodb://localhost/", function(err, db) {
  var newDB = db.db("newDB");
  newDB.createCollection("newColleciton", function(err, collection){
    if(!err){
      console.log("New Database and Collection Created");
    }
  });
});