Answers for "create user in mongodb for connection"

mongodb add user

use <your database>
db.createUser({
  user: '<some username>',
  pwd: passwordPrompt(),
  roles: [{
    role: 'readWrite',
    db: '<your database>'
  }]
})

mongo create user

db.createUser(
  { 
    user: "user_name", 
    pwd: "password", 
    roles: [
      "userAdminAnyDatabase", 
      "dbAdminAnyDatabase", 
      "readWriteAnyDatabase"
    ]
  }
)