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Backblaze Large Files API

Multi-part upload for large files

Backblaze Large Files API is one of 7 APIs that Backblaze publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

Tagged areas include Large Files. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and a getting-started guide.

This API exposes 6 operations across 6 paths, and defines 12 schemas. It is described by OpenAPI 3.0.3, at version v4.

Requests are made against a single base URL, https://api.backblazeb2.com.

6 operations 6 paths 12 schemas 6 POST

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.0.3
API Version
v4
Server
https://api.backblazeb2.com
Authentication
HTTP Bearer, HTTP Basic
Resource Areas
1

Authentication & Security 2

Backblaze Large Files API declares 2 security schemes for authenticating requests. It accepts HTTP bearer tokens (ApplicationKeyAuth). It accepts HTTP basic authentication (BasicAuth). By default, every request must be authenticated.

  • ApplicationKeyAuth — Authorization token obtained from b2authorizeaccount
  • BasicAuth — HTTP Basic auth using applicationKeyId as username and applicationKey as password

Paths & Operations 6

Across 6 paths, the API surfaces 6 operations — 6 POST. Each is listed below with its method, path, parameters, and response codes.

Large Files 6

Multi-part upload for large files

POST
/b2api/v4/b2_start_large_file
Backblaze B2 Native API Start Large File
startLargeFile body → 200401
POST
/b2api/v4/b2_get_upload_part_url
Backblaze B2 Native API Get Upload Part URL
getUploadPartUrl body → 200401
POST
/b2api/v4/b2_finish_large_file
Backblaze B2 Native API Finish Large File
finishLargeFile body → 200401
POST
/b2api/v4/b2_cancel_large_file
Backblaze B2 Native API Cancel Large File
cancelLargeFile body → 200401
POST
/b2api/v4/b2_list_parts
Backblaze B2 Native API List Parts
listParts body → 200401
POST
/b2api/v4/b2_list_unfinished_large_files
Backblaze B2 Native API List Unfinished Large Files
listUnfinishedLargeFiles body → 200401

Schemas 12

The contract defines 12 schemas that model the data the API accepts and returns. The most detailed are FileInfo (10 properties), StartLargeFileRequest (5 properties), CancelLargeFileResponse (4 properties), ListUnfinishedLargeFilesRequest (4 properties). Each schema is shown below with its type and property counts.

ListPartsResponse
object
2 properties
FinishLargeFileRequest
object
2 properties 2 required
ListUnfinishedLargeFilesResponse
object
2 properties
ListUnfinishedLargeFilesRequest
object
4 properties 1 required
GetUploadPartUrlRequest
object
1 property 1 required
CancelLargeFileRequest
object
1 property 1 required
StartLargeFileRequest
object
5 properties 3 required
GetUploadPartUrlResponse
object
3 properties
FileInfo
object
Information about a stored file
10 properties
ListPartsRequest
object
3 properties 1 required
CancelLargeFileResponse
object
4 properties
ErrorResponse
object
Standard B2 error response
3 properties

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

backblaze-large-files-api-openapi.yml Raw ↑

Other APIs Backblaze publishes across the network.

Backblaze S3-Compatible API
Backblaze Application Keys API
Backblaze Authorization API
Backblaze Buckets API
Backblaze Files API
Backblaze Notifications API
Where this information came from

This is an independent, third-party profile of Backblaze Large Files API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

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