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Stores a new object and metadata. The uploaded object replaces any existing object with the same name. For an overview of uploading to Cloud Storage, see Uploads and downloads. For examples of performing object uploads with different Cloud Storage tools and client libraries, see the Uploading Objects guide.
This method accepts uploaded object data with the following characteristics:
*/*This method generally requires the following headers be included in a request:
Note: Metadata-only requests are not allowed. To change an object's metadata, use the patch method.
Required permissionsThe authenticated user must have the storage.objects.create IAM permission to use this method. If the object being inserted has the same name as an existing object, the user must also have the storage.objects.delete permission to overwrite the existing object. If the request body includes the retention property, the authenticated user must also have the storage.objects.setRetention IAM permission.
Note: The request endpoint for this method differs from typical Cloud Storage JSON API endpoints.
POST https://storage.googleapis.com/upload/storage/v1/b/bucket/o
In addition to standard query parameters, the following query parameters apply to this method. Note that for resumable uploads, these headers can be used in the initial POST request but are ignored in the subsequent PUT requests.
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 to store the new object. Overrides the provided object metadata's bucket value, if any. Required query parameters name string Name of the object. Not required if the request body contains object metadata that includes a name value. Overrides the object metadata's name value, if any. For information about how to URL encode object names to be path safe, see Encoding URI path parts. uploadType string The type of upload request to the /upload URI. Acceptable values are:
media - Data-only upload. Upload the object data only, without any metadata.multipart - Multipart upload. Upload both the object data and its metadata, in a single request.resumable - Resumable upload. Upload the object data in a resumable fashion, using a series of at least two requests where the first request includes the metadata.contentEncoding string If set, sets the contentEncoding property of the final object to this value. Setting this parameter is equivalent to setting the contentEncoding metadata property. This can be useful when uploading an object with uploadType=media to indicate the encoding of the content being uploaded. 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. For more information, see Request preconditions. 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. For more information, see Request preconditions. ifMetagenerationMatch long Makes the operation conditional on whether the object's current metageneration matches the given value. For more information, see Request preconditions. ifMetagenerationNotMatch long Makes the operation conditional on whether the object's current metageneration does not match the given value. For more information, see Request preconditions. kmsKeyName string Resource name of the Cloud KMS key that will be used to encrypt the object. If not specified, the request uses the bucket's default Cloud KMS key, if any, or else it uses standard Cloud Storage encryption. 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, unless the object resource specifies the acl property, when it defaults to 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. Used when encrypting the uploaded object with a customer-supplied encryption key. X-Goog-Encryption-Key string An RFC 4648 Base64-encoded string of your AES-256 encryption key. Used when encrypting the uploaded object with a customer-supplied encryption key. X-Goog-Encryption-Key-Sha256 string An RFC 4648 Base64-encoded string of the SHA256 hash of your encryption key. Used when encrypting the uploaded object with a customer-supplied encryption key. X-Goog-Meta-KEY string Applicable only when used the final request of a resumable upload. An optional way to set custom metadata for the uploaded object. Request body
When performing a simple upload, provide the object data in the request body. When performing a multipart upload or when initiating a resumable upload, both of which allow you to include object metadata as part of the request, supply the following properties. If you do not wish to provide object metadata in a resumable upload, the request body can be empty.
Property name Value Description Notes Optional Propertiesacl[] list Access controls on the object, containing one or more objectAccessControls Resources. Do not supply this field if iamConfiguration.uniformBucketLevelAccess.enabled is true for the bucket to which you are uploading the object. 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 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 Data validation. writable customTime datetime1 A user-specified timestamp for the object in RFC 3339 format. writable eventBasedHold boolean Whether or not the object is subject to an event-based hold. writable md5Hash string MD5 hash of the data; encoded using base64. For more information about using the MD5 hash, see Data validation. writable metadata object User-provided metadata, in key/value pairs. writable metadata.(key) string An individual metadata entry. writable name string The name of the object. Required if not specified by URL parameter. 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 datetime1 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 storageClass string Storage class of the object. 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.
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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