Backblaze B2 MCP Server

A Model Context Protocol (MCP) server that provides seamless integration with Backblaze B2 cloud storage. Built as a wrapper around the backblaze-b2 npm package, this server enables MCP clients like Claude Desktop, VS Code, and Cursor to interact with your B2 buckets and files.

Features

• Bucket Management - Create, delete, list, and update buckets

• File Operations - Upload, list, hide, and delete files

• Large File Support - Multipart uploads for files >100MB

• Key Management - Manage application keys and permissions

• Simple Setup - Just configure your B2 credentials in MCP config

Configuration

Get B2 Credentials

1. Sign up at Backblaze B2

2. Go to App Keys in your account

3. Create a new application key

4. Copy the keyID and applicationKey

MCP Client Setup

Add this configuration to your MCP client:

Claude Desktop (~/Library/Application Support/Claude/claude_desktop_config.json):

{
  "mcpServers": {
    "backblaze-b2": {
      "command": "npx",
      "args": ["backblaze-mcp"],
      "env": {
        "B2_APPLICATION_KEY_ID": "your_key_id_here",
        "B2_APPLICATION_KEY": "your_application_key_here"
      }
    }
  }
}

VS Code/Cursor (.vscode/mcp.json):

{
  "servers": {
    "backblaze-b2": {
      "command": "npx",
      "args": ["backblaze-mcp"],
      "env": {
        "B2_APPLICATION_KEY_ID": "your_key_id_here",
        "B2_APPLICATION_KEY": "your_application_key_here"
      }
    }
  }
}

Available Tools

Bucket Management (5 tools)

• createBucket - Create a new bucket

• deleteBucket - Delete a bucket

• listBuckets - List all buckets

• getBucket - Get bucket info

• updateBucket - Change bucket type (public/private)

File Operations (7 tools)

• getUploadUrl - Get upload URL

• uploadFile - Upload a file (base64-encoded)

• listFileNames - List files in a bucket

• listFileVersions - List all file versions

• hideFile - Hide a file from listings

• getFileInfo - Get file metadata

• deleteFileVersion - Delete a file version

• getDownloadAuthorization - Get download auth token

Large File Operations (5 tools)

For files >100MB:

• startLargeFile - Start large file upload

• getUploadPartUrl - Get part upload URL

• uploadPart - Upload a file part

• listParts - List uploaded parts

• finishLargeFile - Complete the upload

• cancelLargeFile - Cancel the upload

Key Management (3 tools)

• createKey - Create application keys

• deleteKey - Delete a key

• listKeys - List all keys

Usage Examples

Upload a File

1. Call getUploadUrl with your bucketId
2. Encode your file to base64
3. Call uploadFile with the URL, token, filename, and base64 data

Large File Upload

1. Call startLargeFile to get a fileId
2. Split file into parts and upload each with uploadPart
3. Call finishLargeFile with SHA1 hashes of all parts

Development

Build from Source

git clone https://github.com/braveram/backblaze-mcp.git
cd backblaze-mcp
npm install
npm run build

Binary Data

File uploads use base64 encoding:

• Encode your file to base64 before calling uploadFile or uploadPart

• The server handles the conversion to binary for B2

Troubleshooting

Server won't start

• Check that B2_APPLICATION_KEY_ID and B2_APPLICATION_KEY are set in your MCP config

• Verify credentials are valid in the B2 console

Upload fails

• Ensure data is properly base64-encoded

• Check bucket permissions

• Use large file operations for files >100MB

Built With

• backblaze-b2 - Backblaze B2 client

• @modelcontextprotocol/sdk - MCP SDK

License

MIT