---
title: Backblaze B2
description: Backblaze B2 via the S3-compatible API. Endpoint derived from the cluster code (us-west-002, us-east-005, eu-central-003, ...).
---

## Installation

`@aws-sdk/client-s3`, `@aws-sdk/s3-presigned-post`, and `@aws-sdk/s3-request-presigner` are optional peer dependencies of `files-sdk` - install alongside the SDK so the adapter's imports resolve at runtime.

```package-install
files-sdk @aws-sdk/client-s3 @aws-sdk/s3-presigned-post @aws-sdk/s3-request-presigner
```

## Usage

```ts lineNumbers
import { Files } from "files-sdk";
import { backblazeB2 } from "files-sdk/backblaze-b2";

const files = new Files({
  adapter: backblazeB2({
    bucket: "uploads",
    region: "us-west-002", // or "us-east-005", "eu-central-003", ...
    // accessKeyId / secretAccessKey auto-loaded from
    // B2_APPLICATION_KEY_ID / B2_APPLICATION_KEY
  }),
});
```

Backblaze B2 via its S3-compatible API. A thin wrapper around the S3 adapter - endpoint derived from the cluster code (`us-west-002`, `us-east-005`, `eu-central-003`, ...), virtual-hosted-style addressing, errors relabelled. Auto-loads from `B2_APPLICATION_KEY_ID` and `B2_APPLICATION_KEY`. Generate an application key in the Backblaze console under Account -> Application Keys; the bucket's cluster is shown next to its endpoint.

## Options

<AutoTypeTable
  path="../../packages/files-sdk/src/backblaze-b2/index.ts"
  name="BackblazeB2AdapterOptions"
/>

## Compatibility

| Method | Status | Notes |
| --- | :-: | --- |
| `upload` | ✅ |  |
| `download` | ✅ |  |
| `delete` | ✅ |  |
| `list` | ⚠️ | The S3 list API returns no per-object `Content-Type`, so `type` is inferred from the key's extension (`application/octet-stream` when unknown). Use `head()` for the stored value. |
| `search` | ✅ |  |
| `head` | ✅ |  |
| `exists` | ✅ |  |
| `copy` | ✅ |  |
| `url` | ✅ |  |
| `signedUploadUrl` | ✅ |  |