Buckets: getIamPolicy

Returns an Identity and Access Management (IAM) policy for the specified bucket. Try it now.

The authenticated user must have sufficient permission to use this method.


HTTP request

GET https://storage.googleapis.com/storage/v1/b/bucket/iam

In addition to standard query parameters, the following query parameters apply to this method:


Parameter name Value Description
Path parameters
bucket string Name of a bucket.
optionsRequestedPolicyVersion int The IAM policy version to be returned. If the optionsRequestedPolicyVersion is for an older version that doesn't support part of the requested IAM policy, the request fails. Required to be 3 or greater for buckets with IAM Conditions.

Request body

Do not supply a request body with this method.


If successful, this method returns a response body with the following structure:

  "version": int,
  "kind": "storage#policy",
  "resourceId": string,
  "bindings": [
      "role": string,
      "members": [
      "condition": {
        "title": string,
        "description": string,
        "expression": RFC 3339 format string
  "etag": bytes
Property name Value Description Notes
version int The IAM policy version.
kind string The kind of item this is. For policies, this field is ignored in a request and is storage#policy in a response.
resourceId string The ID of the resource to which this policy belongs. The response for this field is of the form projects/_/buckets/bucket. This field is ignored in a request.
bindings[] list An association between a role, which comes with a set of permissions, and members who may assume that role.
bindings[].role string The role to which members belong. Two types of roles are supported: standard IAM roles, which grant permissions that do not map directly to those provided by ACLs, and legacy IAM roles, which do map directly to ACL permissions. All roles are of the format roles/storage.specificRole.
See Cloud Storage IAM Roles for a list of available roles.
bindings[].members[] list A collection of identifiers for members who may assume the provided role. Recognized identifiers are as follows:
  • allUsers — A special identifier that represents anyone on the internet; with or without a Google account.
  • allAuthenticatedUsers — A special identifier that represents anyone who is authenticated with a Google account or a service account.
  • user:emailid — An email address that represents a specific account. For example, user:alice@gmail.com or user:joe@example.com.
  • serviceAccount:emailid — An email address that represents a service account. For example, serviceAccount:my-other-app@appspot.gserviceaccount.com .
  • group:emailid — An email address that represents a Google group. For example, group:admins@example.com.
  • domain:domain — A G Suite domain name that represents all the users of that domain. For example, domain:google.com or domain:example.com.
  • projectOwner:projectid — Owners of the given project. For example, projectOwner:my-example-project
  • projectEditor:projectid — Editors of the given project. For example, projectEditor:my-example-project
  • projectViewer:projectid — Viewers of the given project. For example, projectViewer:my-example-project
bindings[].condition object

A condition object associated with this binding. Each role binding can only contain one condition.

bindings[].condition.title string Title of the condition. For example, "expires_end_of_2018".
bindings[].condition.description string Optional description of the condition. For example, "Expires at midnight on 2018-12-31". optional
bindings[].condition.expression string Attribute-based logic expression using a subset of the Common Expression Language (CEL). For example, "request.time < timestamp('2019-01-01T00:00:00Z')".
etag bytes HTTP 1.1 Entity tag for the policy. writable

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