Creates a new user on the database where you run the command. The createUser command returns a duplicate user error if the user exists. The createUser command uses the following syntax:

{ createUser: "<name>",
  pwd: "<cleartext password>",
  customData: { <any information> },
  roles: [
    { role: "<role>", db: "<database>" } | "<role>",
  writeConcern: { <write concern> }

createUser has the following fields:

Field Type Description
createUser string The name of the new user.
pwd string The user’s password. The pwd field is not required if you run createUser on the $external database to create users who have credentials stored externally to MongoDB.
customData document Optional. Any arbitrary information. This field can be used to store any data an admin wishes to associate with this particular user. For example, this could be the user’s full name or employee id.
roles array The roles granted to the user.
writeConcern document Optional. The level of write concern for the creation operation. The writeConcern document takes the same fields as the getLastError command.

In the roles field, you can specify both built-in roles and user-defined role.

To specify a role that exists in the same database where createUser runs, you can either specify the role with the name of the role:


Or you can specify the role with a document, as in:

{ role: "<role>", db: "<database>" }

To specify a role that exists in a different database, specify the role with a document.


createUser sends password to the MongoDB instance in cleartext. To encrypt the password in transit, use SSL.

Users created on the $external database should have credentials stored externally to MongoDB, as, for example, with MongoDB Enterprise installations that use Kerberos.

Required Access

You must have the createUser action on a database to create a new user on that database.

You must have the grantRole action on a role’s database to grant the role to another user.

If you have the userAdmin or userAdminAnyDatabase role, or if you are authenticated using the localhost exception, you have those actions.


The following createUser command creates a user accountAdmin01 on the products database. The command gives accountAdmin01 the clusterAdmin and readAnyDatabase roles on the admin database and the readWrite role on the products database:

db.getSiblingDB("products").runCommand( { createUser: "accountAdmin01",
                                          pwd: "cleartext password",
                                          customData: { employeeId: 12345 },
                                          roles: [
                                                   { role: "clusterAdmin", db: "admin" },
                                                   { role: "readAnyDatabase", db: "admin" },
                                          writeConcern: { w: "majority" , wtimeout: 5000 }
                                       } )