Mongodb javascript to insert many document

mongo.js

var user = [{
    username  : "navjot",
    firstname : "Navjot",
    lastname : "Dhanawat"
},{
    username  : "vitthal",
    firstname : "Vitthal",
    lastname : "Hajare"
},{
    username  : "shiva",
    firstname : "Shiva",
    lastname : "Sakle"
}];

db.Users.insertMany(user);

Run:

mongo 127.0.0.1/test mongo.js