The Objects resource represents an object within Google Cloud Storage. Objects are pieces of data that you have uploaded to Google Cloud Storage. For more information, see Object Name Requirements.

Every object in Google Cloud Storage resides in a bucket. The object is owned by its original uploader, who will always retain OWNER permission on it.

In addition to the acl property, objects contain objectAccessControls, for use in fine-grained manipulation of an existing object's access controls.

To try out the methods for this resource, see Methods.

Resource representations

  "kind": "storage#object",
  "id": string,
  "selfLink": string,
  "name": string,
  "bucket": string,
  "generation": long,
  "metageneration": long,
  "contentType": string,
  "timeCreated": datetime,
  "updated": datetime,
  "timeDeleted": datetime,
  "temporaryHold": boolean,
  "eventBasedHold": boolean,
  "retentionExpirationTime": datetime,
  "storageClass": string,
  "timeStorageClassUpdated": datetime,
  "size": unsigned long,
  "md5Hash": string,
  "mediaLink": string,
  "contentEncoding": string,
  "contentDisposition": string,
  "contentLanguage": string,
  "cacheControl": string,
  "metadata": {
    (key): string
  "acl": [
    objectAccessControls Resource
  "owner": {
    "entity": string,
    "entityId": string
  "crc32c": string,
  "componentCount": integer,
  "etag": string,
  "customerEncryption": {
    "encryptionAlgorithm": string,
    "keySha256": string
  "kmsKeyName": string
Property name Value Description Notes
acl[] list Access controls on the object, containing one or more objectAccessControls Resources. writable
bucket string The name of the bucket containing this object.
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
componentCount integer Number of underlying components that make up this object. Components are accumulated by compose operations, counting 1 for each non-composite source object and componentCount for each composite source object. Note: componentCount is included in the metadata for composite objects only.
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
crc32c string CRC32c checksum, as described in RFC 4960, Appendix B; encoded using base64 in big-endian byte order. For more information about using the CRC32c checksum, see Hashes and ETags: Best Practices. writable
customerEncryption object Metadata of customer-supplied encryption key, if the object is encrypted by such a key.
customerEncryption.encryptionAlgorithm string The encryption algorithm.
customerEncryption.keySha256 string SHA256 hash value of the encryption key.
etag string HTTP 1.1 Entity tag for the object.
eventBasedHold boolean Whether or not the object is subject to an event-based hold. writable
generation long The content generation of this object. Used for object versioning.
id string The ID of the object, including the bucket name, object name, and generation number.
kind string The kind of item this is. For objects, this is always storage#object.
kmsKeyName string Cloud KMS Key used to encrypt this object, if the object is encrypted by such a key.
md5Hash string MD5 hash of the data; encoded using base64. For more information about using the MD5 hash, see Hashes and ETags: Best Practices. writable
metadata object User-provided metadata, in key/value pairs. writable
metadata.(key) string An individual metadata entry. writable
metageneration long The version of the metadata for this object at this generation. Used for preconditions and for detecting changes in metadata. A metageneration number is only meaningful in the context of a particular generation of a particular object.
name string The name of the object. Required if not specified by URL parameter. writable
owner object The owner of the object. This will always be the uploader of the object.
owner.entity string The entity, in the form user-userId.
owner.entityId string The ID for the entity.
retentionExpirationTime datetime The earliest time that the object can be deleted, based on a bucket's retention policy, in RFC 3339 format.
size unsigned long Content-Length of the data in bytes.
storageClass string Storage class of the object. writable
temporaryHold boolean Whether or not the object is subject to a temporary hold. writable
timeCreated datetime The creation time of the object in RFC 3339 format.
timeDeleted datetime The deletion time of the object in RFC 3339 format. Returned if and only if this version of the object is no longer a live version, but remains in the bucket as an archived object.
timeStorageClassUpdated datetime The time at which the object's storage class was last changed. When the object is initially created, it will be set to timeCreated.
updated datetime The modification time of the object metadata in RFC 3339 format.


Available methods for Objects resources are as follows:

Concatenates a list of existing objects into a new object in the same bucket.
Copies a source object to a destination object. Optionally overrides metadata.
Deletes an object and its metadata. Deletions are permanent if versioning is not enabled for the bucket, or if the generation parameter is used.
Retrieves an object or its metadata.
Stores a new object and metadata. For tips on uploading to Google Cloud Storage, see best practices.
Retrieves a list of objects matching the criteria.
Updates a data blob's associated metadata. This method supports patch semantics.
Rewrites a source object to a destination object. Optionally overrides metadata.
Updates an object's metadata.
Watch for changes on all objects in a bucket.


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