Request Direct R2 Upload URL

POST

/uploads/presign

Validates file metadata against account quotas, atomically reserves storage capacity, and generates a short-lived presigned PUT URL targeting a temporary R2 key.

Request

Authorization

Bearer Token

Provide your bearer token in the

Authorization

header when making requests to protected resources.

Example:

Authorization: Bearer ********************

Body Params application/jsonRequired

Examples

Responses

🟢201

application/json

Temporary upload URL generated

Bodyapplication/json

🟠400BadRequest

🟠401Unauthorized

🟠403Forbidden

🟠429RateLimited

Request Example

Shell

JavaScript

Java

Swift

curl --location '/uploads/presign' \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '{
    "filename": "hero.png",
    "content_type": "image/png",
    "size": 245817,
    "checksum_sha256": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
    "privacy": "public"
}'

Response Example

201 - Example 1

{
    "upload_id": "upl_9f3b1458-45a2-4a0b-8d59-2c7bb2de3f1a",
    "upload_url": "http://example.com",
    "expires_at": "2019-08-24T14:15:22.123Z",
    "required_headers": {
        "Content-Type": "image/png",
        "x-amz-checksum-sha256": "string"
    }
}

Modified at 2026-10-11 18:32:15

Retrieve Account & API Usage

Finalize Upload & Promote Asset