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Updates a data blob's associated metadata. This method supports patch semantics.
Required permissionsThe authenticated user must have the storage.objects.update IAM permission to use this method. If the request body includes the retention property, the authenticated user must also have the storage.objects.setRetention IAM permission, and if the request includes the query parameter overrideUnlockedRetention, the authenticated user must also have the storage.objects.overrideUnlockedRetention IAM permission.
To update object access control lists (ACLs), which only apply to objects stored in buckets with uniform bucket-level access disabled, the authenticated user must also have the storage.objects.setIamPolicy permission. To return ACLs as part of the response, the authenticated user must also have the storage.objects.getIamPolicy permission.
PATCH https://storage.googleapis.com/storage/v1/b/bucket/o/object
In addition to standard query parameters, the following query parameters apply to this method.
To see an example of how to include query parameters in a request, see the JSON API Overview page.
Parameters Parameter name Value Description Path parametersbucket string Name of the bucket in which the object resides. object string Name of the object. For information about how to URL encode object names to be path safe, see Encoding URI path parts. Optional query parameters generation long If present, selects a specific revision of this object (as opposed to the latest version, the default). ifGenerationMatch long Makes the operation conditional on whether the object's current generation matches the given value. Setting to 0 makes the operation succeed only if there are no live versions of the object. ifGenerationNotMatch long Makes the operation conditional on whether the object's current generation does not match the given value. If no live object exists, the precondition fails. Setting to 0 makes the operation succeed only if there is a live version of the object. ifMetagenerationMatch long Makes the operation conditional on whether the object's current metageneration matches the given value. ifMetagenerationNotMatch long Makes the operation conditional on whether the object's current metageneration does not match the given value. overrideUnlockedRetention boolean Applicable for object's that have an unlocked retention configuration: Required to be set to true if the operation includes a retention property that changes the mode to Locked, reduces the retainUntilTime, or removes the retention configuration from the object. predefinedAcl string Apply a predefined set of access controls to this object.
Acceptable values are:
authenticatedRead: Object owner gets OWNER access, and allAuthenticatedUsers get READER access.bucketOwnerFullControl: Object owner gets OWNER access, and project team owners get OWNER access.bucketOwnerRead: Object owner gets OWNER access, and project team owners get READER access.private: Object owner gets OWNER access.projectPrivate: Object owner gets OWNER access, and project team members get access according to their roles.publicRead: Object owner gets OWNER access, and allUsers get READER access.iamConfiguration.uniformBucketLevelAccess.enabled is set to true, requests that include this parameter fail with a 400 Bad Request response.
projection string Set of properties to return. Defaults to noAcl.
NOTE: Currently only works if you override the default and specify full.
Acceptable values are:
full: Include all properties.noAcl: Omit the owner, acl property.X-Goog-Encryption-Algorithm string The encryption algorithm to use, which must be AES256. Use this header if the object is encrypted with a customer-supplied encryption key and you want the object's content hashes returned in the response. X-Goog-Encryption-Key string An RFC 4648 Base64-encoded string of your AES-256 encryption key. Use this header if the object is encrypted with a customer-supplied encryption key and you want the object's content hashes returned in the response. X-Goog-Encryption-Key-Sha256 string An RFC 4648 Base64-encoded string of the SHA256 hash of your encryption key. Use this header if the object is encrypted with a customer-supplied encryption key and you want the object's content hashes returned in the response. Request body
In the request body, supply the relevant portions of an object resource, according to the rules of patch semantics.
ResponseIf successful, this method returns an object resource in the response body.
For information about status and error codes returned by this API, see the reference page.
Try it!Use the APIs Explorer below to call this method on live data and see the response.
Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2025-08-07 UTC.
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