Objects: update

Updates the metadata of an object.

Required permissions

The authenticated user must have the storage.objects.update IAM permission to use this method.

Additionally, the following permissions are required for specific request properties or parameters:

If the request body includes the retention property: storage.objects.setRetention
To use the overrideUnlockedRetention query parameter: storage.objects.overrideUnlockedRetention
To update object access control lists (ACLs), which only apply to objects stored in buckets with uniform bucket-level access disabled: storage.objects.setIamPolicy
To return ACLs as part of the response: storage.objects.getIamPolicy
To attach object contexts: storage.objects.createContext
To update object contexts: storage.objects.updateContext
To remove object contexts: storage.objects.deleteContext

Request

HTTP request

PUT 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 parameters

bucket

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.

If 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 full .

Acceptable values are:

full : Include all properties.
noAcl : Omit the owner , acl property.

Optional extension headers

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 an object resource with any of the following optional properties:

Property name	Value	Description	Notes
`acl[]`	`list`	Access controls on the object. If empty, this parameter is ignored. Can contain one or more objectAccessControls Resources . Note:ACLs do not apply to objects in buckets where `iamConfiguration.uniformBucketLevelAccess.enabled` is set to `true` . Requests to such objects fail with a `400 Bad Request` response if the request contains a non-empty `acl[]` property.	writable
`cacheControl`	`string`	Cache-Control directive for the object data. If omitted, and the object is accessible to all anonymous users, the default will be `"public, max-age=3600"` .	writable
`contentDisposition`	`string`	Content-Disposition of the object data.	writable
`contentEncoding`	`string`	Content-Encoding of the object data.	writable
`contentLanguage`	`string`	Content-Language of the object data.	writable
`contentType`	`string`	Content-Type of the object data. If an object is stored without a Content-Type, it is served as application/octet-stream.	writable
`contexts`	`object`	Contexts attached to the object, specified in key-value pairs. For more information about object contexts ( Preview ), see Object context overview . For specific JSON formats and combinations, see Attach or modify contexts to an existing object .	writable
`customTime`	`datetime` ¹	A user-specified timestamp for the object in RFC 3339 format. If the object has `customTime` metadata already set on it, any update request must include a `customTime` with an equal or later datetime.	writable
`eventBasedHold`	`boolean`	Whether or not the object is subject to an event-based hold .	writable
`metadata`	`object`	User-provided metadata, in key/value pairs.	writable
`metadata.(key)`	`string`	An individual metadata entry.	writable
`retention`	`object`	The object's retention configuration , which defines the earliest datetime that the object can be deleted or replaced.	writable
`retention.mode`	`string`	The mode of the retention configuration, which can be either `Unlocked` or `Locked` . If set to `Locked` , `retention.mode` cannot be changed, the retention configuration cannot be removed, and `retention.retainUntilTime` cannot be reduced.	writable
`retention.retainUntilTime`	`datetime` ¹	The earliest time that the object can be deleted or replaced, in RFC 3339 format. This property has a maximum value of 3,155,760,000 seconds (100 years) from the current date and time.	writable
`temporaryHold`	`boolean`	Whether or not the object is subject to a temporary hold .	writable

¹ This property is a string formatted as the specified value type.

Response

If 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.