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db.grantRolesToUser(username, roles, writeConcern)

Grants additional roles to a user.

The grantRolesToUser method uses the following syntax:

db.grantRolesToUser( "<username>", [ <roles> ], { <writeConcern> } )

The grantRolesToUser method takes the following arguments:

Parameter Type Description
user string The name of the user to whom to grant roles.
roles array An array of additional roles to grant to the user.
writeConcern document Optional. The level of write concern for the modification. 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 db.grantRolesToUser() 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.

The db.grantRolesToUser() method wraps the grantRolesToUser command.

Required Access

You must have the grantRole action on a database to grant a role on that database.


Given a user accountUser01 in the products database with the following roles:

"roles" : [
    { "role" : "assetsReader",
      "db" : "assets"

The following grantRolesToUser() operation gives accountUser01 the readWrite role on the products database and the read role on the stock database.

use products
   [ "readWrite" , { role: "read", db: "stock" } ],
   { w: "majority" , wtimeout: 4000 }

The user accountUser01 in the products database now has the following roles:

"roles" : [
    { "role" : "assetsReader",
      "db" : "assets"
    { "role" : "read",
      "db" : "stock"
    { "role" : "readWrite",
      "db" : "products"