add user mongodb shell code example

Example 1: mongodb add user

use 
db.createUser({
  user: '',
  pwd: passwordPrompt(),
  roles: [{
    role: 'readWrite',
    db: ''
  }]
})

Example 2: create admin user in mongodb

use admin
db.createUser(
      {
          user: "username",
          pwd: "password",
          roles: [ "root" ]
      }
  )

Example 3: mongodb add admin user

use admin
db.createUser({
  user: "username",
  pwd: "password",
  roles: [ "root" ]
})