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Assigns additional privileges to a user-defined role defined on the database on which the command is run. The grantPrivilegesToRole command uses the following syntax:

grantPrivilegesToRole: "<role>",
privileges: [
resource: { <resource> }, actions: [ "<action>", ... ]
writeConcern: { <write concern> },
comment: <any>

The grantPrivilegesToRole command has the following fields:

The name of the user-defined role to grant privileges to.
The privileges to add to the role. For the format of a privilege, see privileges.

Optional. The level of write concern for the operation. See Write Concern Specification.


Optional. A user-provided comment to attach to this command. Once set, this comment appears alongside records of this command in the following locations:

A comment can be any valid BSON type (string, integer, object, array, etc).

New in version 4.4.

A role's privileges apply to the database where the role is created. A role created on the admin database can include privileges that apply to all databases or to the cluster.

You must have the grantRole action on the database a privilege targets in order to grant the privilege. To grant a privilege on multiple databases or on the cluster resource, you must have the grantRole action on the admin database.

The following grantPrivilegesToRole command grants two additional privileges to the service role that exists in the products database:

use products
grantPrivilegesToRole: "service",
privileges: [
resource: { db: "products", collection: "" }, actions: [ "find" ]
resource: { db: "products", collection: "system.js" }, actions: [ "find" ]
writeConcern: { w: "majority" , wtimeout: 5000 }

The first privilege in the privileges array allows the user to search on all non-system collections in the products database. The privilege does not allow queries on system collections, such as the system.js collection. To grant access to these system collections, explicitly provision access in the privileges array. See Resource Document.

The second privilege explicitly allows the find action on system.js collections on all databases.

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