Azure Blob Driver

Azure Blob Storage driver for @minimajs/disk. Use one File API across local and Azure environments while keeping Azure Blob as the storage backend.

Features

🌐 Web-Native APIs - Use File, Blob, ReadableStream instead of Azure SDK methods
✅ Streaming Uploads - Efficient streaming uploads to Azure Blob Storage
✅ Streaming Downloads - Direct streaming from Azure without buffering
✅ CDN Integration - Configure Azure CDN or custom public URLs
✅ Metadata Support - Store and retrieve custom blob metadata
✅ Server-Side Copy - Fast native Azure copy operations via beginCopyFromURL
✅ List Operations - Paginated blob listing with prefix support
✅ Multi-Container - Work across multiple containers using full Azure URLs
✅ Minimal Dependencies - Only requires @azure/storage-blob

Best Fit

Choose the Azure Blob driver when you need:

managed object storage on Azure
container-level separation across apps or tenants
CDN/public URL delivery for static assets
a shared API with non-Azure environments

Installation

bash

npm install @minimajs/azure-blob @minimajs/disk
# or
bun add @minimajs/azure-blob @minimajs/disk

Usage

Basic Configuration

typescript

import { createAzureBlobDriver } from "@minimajs/azure-blob";
import { createDisk } from "@minimajs/disk";

const disk = createDisk({
  driver: createAzureBlobDriver({
    connectionString: process.env.AZURE_STORAGE_CONNECTION_STRING!,
    container: "uploads",
  }),
});

// Web-native API - works like browser File API
const file = new File(["Hello World"], "hello.txt");
await disk.put(file); // Stored as "hello.txt" (original filename preserved)

// Use storeAs(...) plugin if you want UUID naming
// import { storeAs } from "@minimajs/disk/plugins";
// const disk = createDisk({ driver: createAzureBlobDriver({...}) }, storeAs("uuid"));

// Or specify path
await disk.put("avatars/photo.jpg", imageBuffer);

// Retrieve file - standard File methods
const retrieved = await disk.get("avatars/photo.jpg");
if (retrieved) {
  const buffer = await retrieved.arrayBuffer(); // Standard File.arrayBuffer()
  const text = await retrieved.text(); // Standard File.text()
  const stream = retrieved.stream(); // Standard File.stream()
}

// Delete file
await disk.delete("avatars/photo.jpg");

With CDN URL

typescript

const disk = createDisk({
  driver: createAzureBlobDriver({
    connectionString: process.env.AZURE_STORAGE_CONNECTION_STRING!,
    container: "uploads",
    publicUrl: "https://mycdn.azureedge.net", // Azure CDN endpoint
  }),
});

await disk.put("images/logo.png", logoBuffer);

// Get CDN URL
const url = await disk.url("images/logo.png");
console.log(url); // https://mycdn.azureedge.net/images/logo.png

Direct Azure Blob URL (without CDN)

When no publicUrl is set, disk.url() returns the direct Azure Blob Storage URL:

typescript

const disk = createDisk({
  driver: createAzureBlobDriver({
    connectionString: process.env.AZURE_STORAGE_CONNECTION_STRING!,
    container: "uploads",
  }),
});

const url = await disk.url("images/logo.png");
console.log(url);
// https://<account>.blob.core.windows.net/uploads/images/logo.png

Multi-Container Setup

When container is NOT set in the driver, use full Azure Blob URLs:

typescript

const disk = createDisk({
  driver: createAzureBlobDriver({
    connectionString: process.env.AZURE_STORAGE_CONNECTION_STRING!,
    // No container specified
  }),
});

// Specify container in the full URL
await disk.put("https://<account>.blob.core.windows.net/images/logo.png", logoBuffer);
await disk.put("https://<account>.blob.core.windows.net/documents/report.pdf", pdfBuffer);

const file = await disk.get("https://<account>.blob.core.windows.net/images/logo.png");

Using an Existing BlobServiceClient

If you already have a BlobServiceClient instance (e.g., with custom authentication), pass it directly:

typescript

import { BlobServiceClient } from "@azure/storage-blob";
import { createAzureBlobDriver } from "@minimajs/azure-blob";
import { createDisk } from "@minimajs/disk";

const client = new BlobServiceClient(
  `https://${process.env.AZURE_STORAGE_ACCOUNT}.blob.core.windows.net`,
  credential // DefaultAzureCredential, SAS token, etc.
);

const disk = createDisk({
  driver: createAzureBlobDriver(client, {
    container: "uploads",
    publicUrl: "https://mycdn.azureedge.net",
  }),
});

Configuration

typescript

interface AzureBlobDriverOptions {
  /**
   * Azure Storage connection string.
   * Required when not passing a BlobServiceClient directly.
   */
  connectionString: string;

  /**
   * Default container name.
   * Optional - can use full Azure Blob URLs instead.
   */
  container?: string;

  /**
   * Public URL for serving files (e.g., Azure CDN endpoint).
   * When set, disk.url() returns URLs with this prefix.
   */
  publicUrl?: string;
}

Examples

Upload with Metadata

typescript

await disk.put("documents/report.pdf", pdfBuffer, {
  type: "application/pdf",
  metadata: {
    author: "Jane Doe",
    department: "Finance",
    year: "2024",
  },
});

// Retrieve with metadata
const file = await disk.get("documents/report.pdf");
console.log(file.type); // "application/pdf"
console.log(file.metadata); // { author: "Jane Doe", ... }

Update Metadata

The AzureBlobDriver supports updating metadata and content type without re-uploading:

typescript

import { AzureBlobDriver } from "@minimajs/azure-blob";

const driver = createAzureBlobDriver({ ... }) as AzureBlobDriver;

await driver.updateMetadata("documents/report.pdf", {
  type: "application/pdf",
  metadata: { reviewed: "true", reviewedBy: "admin" },
});

List Blobs

typescript

// List all blobs in the container
for await (const file of disk.list()) {
  console.log(file.href, file.size);
}

// List with prefix
for await (const file of disk.list("uploads/2024/")) {
  console.log(file.name, file.type, file.lastModified);
}

// List with limit
for await (const file of disk.list("uploads/", { limit: 50 })) {
  console.log(file.href);
}

Copy and Move

typescript

// Copy within same container
await disk.copy("originals/photo.jpg", "thumbnails/photo.jpg");

// Move (copy + delete source)
await disk.move("uploads/temp/file.jpg", "uploads/processed/file.jpg");

// Copy using DiskFile reference
const source = await disk.get("originals/photo.jpg");
await disk.copy(source, "backups/photo.jpg");

Streaming Large Files

typescript

// Upload a large file from a ReadableStream
const stream = fs.createReadStream("large-video.mp4");
await disk.put("videos/large-video.mp4", Readable.toWeb(stream));

// Stream download to HTTP response
const file = await disk.get("videos/large-video.mp4");
return new Response(file.stream(), {
  headers: {
    "Content-Type": file.type,
    "Content-Length": String(file.size),
  },
});

Concurrent Operations

typescript

// Upload multiple files in parallel
await Promise.all([disk.put("file1.txt", "Data 1"), disk.put("file2.txt", "Data 2"), disk.put("file3.txt", "Data 3")]);

// Download multiple files in parallel
const [file1, file2] = await Promise.all([disk.get("file1.txt"), disk.get("file2.txt")]);

Azure Credentials

Connection String (simplest)

bash

AZURE_STORAGE_CONNECTION_STRING="DefaultEndpointsProtocol=https;AccountName=...;AccountKey=...;EndpointSuffix=core.windows.net"

typescript

const disk = createDisk({
  driver: createAzureBlobDriver({
    connectionString: process.env.AZURE_STORAGE_CONNECTION_STRING!,
    container: "uploads",
  }),
});

Managed Identity / DefaultAzureCredential

For production deployments on Azure (App Service, AKS, Azure Functions), use DefaultAzureCredential for passwordless auth:

bash

npm install @azure/identity

typescript

import { BlobServiceClient } from "@azure/storage-blob";
import { DefaultAzureCredential } from "@azure/identity";
import { createAzureBlobDriver } from "@minimajs/azure-blob";
import { createDisk } from "@minimajs/disk";

const client = new BlobServiceClient(
  `https://${process.env.AZURE_STORAGE_ACCOUNT}.blob.core.windows.net`,
  new DefaultAzureCredential()
);

const disk = createDisk({
  driver: createAzureBlobDriver(client, { container: "uploads" }),
});

SAS Token

typescript

import { BlobServiceClient } from "@azure/storage-blob";

const client = new BlobServiceClient(
  `https://${process.env.AZURE_STORAGE_ACCOUNT}.blob.core.windows.net?${process.env.AZURE_SAS_TOKEN}`
);

const disk = createDisk({
  driver: createAzureBlobDriver(client, { container: "uploads" }),
});

href Format

Azure Blob Storage hrefs follow the standard Azure URL format:

https://<account>.blob.core.windows.net/<container>/<blob-path>

When publicUrl is configured and disk.url() is called, the returned URL uses the CDN prefix instead:

https://<cdn>.azureedge.net/<blob-path>

All disk operations (get, copy, move, delete) accept both the full Azure URL and plain paths (when container is configured):

typescript

// These are equivalent when container: "uploads" is set
await disk.get("avatars/photo.jpg");
await disk.get("https://<account>.blob.core.windows.net/uploads/avatars/photo.jpg");

Error Handling

typescript

import { DiskFileNotFoundError, DiskWriteError, DiskReadError } from "@minimajs/disk";

try {
  const file = await disk.get("missing.txt");
} catch (error) {
  if (error instanceof DiskFileNotFoundError) {
    console.log("Blob not found:", error.href);
  } else if (error instanceof DiskReadError) {
    console.log("Failed to read blob:", error.message);
  }
}

try {
  await disk.put("uploads/photo.jpg", imageBuffer);
} catch (error) {
  if (error instanceof DiskWriteError) {
    console.log("Failed to upload blob:", error.message);
  }
}

Key Benefits

Use one application-level API across local, Azure, S3, and memory drivers.
Keep stream-based transfers for large file workflows.
Integrate with CDN/public URL patterns without changing app logic.
Add naming, partitioning, and security policies through plugins.

Azure Blob Driver ​

Features ​

Best Fit ​

Installation ​

Usage ​

Basic Configuration ​

With CDN URL ​

Direct Azure Blob URL (without CDN) ​

Multi-Container Setup ​

Using an Existing BlobServiceClient ​

Configuration ​

Examples ​

Upload with Metadata ​

Update Metadata ​

List Blobs ​

Copy and Move ​

Streaming Large Files ​

Concurrent Operations ​

Azure Credentials ​

Connection String (simplest) ​

Managed Identity / DefaultAzureCredential ​

SAS Token ​

href Format ​

Error Handling ​

See Also ​

Key Benefits ​

Azure Blob Driver

Features

Best Fit

Installation

Usage

Basic Configuration

With CDN URL

Direct Azure Blob URL (without CDN)

Multi-Container Setup

Using an Existing BlobServiceClient

Configuration

Examples

Upload with Metadata

Update Metadata

List Blobs

Copy and Move

Streaming Large Files

Concurrent Operations

Azure Credentials

Connection String (simplest)

Managed Identity / DefaultAzureCredential

SAS Token

href Format

Error Handling

See Also

Key Benefits