Azure Storage Blob TS

MicrosoftOfficialCreated by Microsoft

Skill
Tool integration
Cloud and DevOps
MIT
No issues found

From the author

Azure Blob Storage JavaScript/TypeScript SDK (@azure/storage-blob) for blob operations. Use for uploading, downloading, listing, and managing blobs and containers. Supports block blobs, append blobs, page blobs, SAS tokens, and streaming. Triggers: "blob storage", "@azure/storage-blob", "BlobServiceClient", "ContainerClient", "upload blob", "download blob", "SAS token", "block blob".

— the description by Microsoft

AutoGineer summary

Written by AutoGineer from the skill’s own files, not by the author

The @azure/storage-blob SDK provides a comprehensive interface for interacting with Azure Blob Storage. It supports various authentication methods, including Microsoft Entra ID and connection strings, and facilitates operations such as uploading, downloading, listing, and managing blobs and containers. The library is designed for both Node.js and browser environments, offering specialized features like streaming for large files, SAS token generation for secure access, and support for block, append, and page blobs.

What it does

Manage storage containers and blobs via a hierarchical client structure.
Upload and download data using buffers, streams, or direct file paths.
Generate Service, Account, and User Delegation SAS tokens for secure access.
Configure blob properties, metadata, and HTTP headers.
Support for block, append, and page blob types.
Handle storage errors with specific status code reporting.

When to use it

When building applications that require cloud-based object storage on Azure.
When you need to implement secure, time-limited access to storage resources via SAS tokens.
When handling large file uploads or downloads that require streaming.
When integrating Azure storage operations into TypeScript or JavaScript projects.

Advantages

Official Microsoft support for Azure Blob Storage.
Strong TypeScript support with comprehensive type definitions.
Flexible authentication options including modern Entra ID integration.
Optimized for large data transfers with built-in streaming and concurrency controls.
Cross-platform compatibility for both Node.js and browser environments.

Usage examples

“How do I upload a local file to Azure Blob Storage using the SDK?”: The agent provides a code snippet using BlockBlobClient.uploadFile, demonstrating how to initialize the client and perform the upload operation.
“Show me how to generate a read-only SAS token for a specific blob.”: The agent provides a function using generateBlobSASQueryParameters, specifying the container, blob name, read permissions, and expiration time.
“How can I list all blobs in a container that start with a specific prefix?”: The agent demonstrates using the listBlobsFlat method on a ContainerClient with a prefix filter option.
“What is the best way to handle errors when creating a container?”: The agent shows a try-catch block using RestError to check for specific HTTP status codes like 404, 409, or 403.

Install

Download the skill as a ZIP:
https://autogineer.com/agent-skills/microsoft/azure-storage-blob-ts/download

Unzip it into the cross-client skills folder of your project:

mkdir -p .agents/skills && unzip azure-storage-blob-ts.zip -d .agents/skills

Documentation by Microsoft

@azure/storage-blob (TypeScript/JavaScript)

SDK for Azure Blob Storage operations — upload, download, list, and manage blobs and containers.

Installation

npm install @azure/storage-blob @azure/identity

Current Version: 12.x
Node.js: >= 18.0.0

Environment Variables

AZURE_STORAGE_ACCOUNT_NAME=<account-name>
AZURE_STORAGE_ACCOUNT_KEY=<account-key>
# OR connection string
AZURE_STORAGE_CONNECTION_STRING=DefaultEndpointsProtocol=https;AccountName=...
AZURE_TOKEN_CREDENTIALS=prod # Required only if DefaultAzureCredential is used in production

Authentication

Microsoft Entra Token Credential (Recommended)

import { BlobServiceClient } from "@azure/storage-blob";
import { DefaultAzureCredential, ManagedIdentityCredential } from "@azure/identity";

// Local dev: DefaultAzureCredential. Production: set AZURE_TOKEN_CREDENTIALS=prod or AZURE_TOKEN_CREDENTIALS=<specific_credential>
const credential = new DefaultAzureCredential({requiredEnvVars: ["AZURE_TOKEN_CREDENTIALS"]});
// Or use a specific credential directly in production:
// See https://learn.microsoft.com/javascript/api/overview/azure/identity-readme?view=azure-node-latest#credential-classes
// const credential = new ManagedIdentityCredential();

const accountName = process.env.AZURE_STORAGE_ACCOUNT_NAME!;
const client = new BlobServiceClient(
  `https://${accountName}.blob.core.windows.net`,
  credential
);

Connection String

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

const client = BlobServiceClient.fromConnectionString(
  process.env.AZURE_STORAGE_CONNECTION_STRING!
);

StorageSharedKeyCredential (Node.js only)

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

const accountName = process.env.AZURE_STORAGE_ACCOUNT_NAME!;
const accountKey = process.env.AZURE_STORAGE_ACCOUNT_KEY!;

const sharedKeyCredential = new StorageSharedKeyCredential(accountName, accountKey);
const client = new BlobServiceClient(
  `https://${accountName}.blob.core.windows.net`,
  sharedKeyCredential
);

SAS Token

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

const accountName = process.env.AZURE_STORAGE_ACCOUNT_NAME!;
const sasToken = process.env.AZURE_STORAGE_SAS_TOKEN!; // starts with "?"

const client = new BlobServiceClient(
  `https://${accountName}.blob.core.windows.net${sasToken}`
);

Client Hierarchy

BlobServiceClient (account level)
└── ContainerClient (container level)
    └── BlobClient (blob level)
        ├── BlockBlobClient (block blobs - most common)
        ├── AppendBlobClient (append-only blobs)
        └── PageBlobClient (page blobs - VHDs)

Container Operations

Create Container

const containerClient = client.getContainerClient("my-container");
await containerClient.create();

// Or create if not exists
await containerClient.createIfNotExists();

List Containers

for await (const container of client.listContainers()) {
  console.log(container.name);
}

// With prefix filter
for await (const container of client.listContainers({ prefix: "logs-" })) {
  console.log(container.name);
}

Delete Container

await containerClient.delete();
// Or delete if exists
await containerClient.deleteIfExists();

Blob Operations

Upload Blob (Simple)

const containerClient = client.getContainerClient("my-container");
const blockBlobClient = containerClient.getBlockBlobClient("my-file.txt");

// Upload string
await blockBlobClient.upload("Hello, World!", 13);

// Upload Buffer
const buffer = Buffer.from("Hello, World!");
await blockBlobClient.upload(buffer, buffer.length);

Upload from File (Node.js only)

const blockBlobClient = containerClient.getBlockBlobClient("uploaded-file.txt");
await blockBlobClient.uploadFile("/path/to/local/file.txt");

Upload from Stream (Node.js only)

import * as fs from "fs";

const blockBlobClient = containerClient.getBlockBlobClient("streamed-file.txt");
const readStream = fs.createReadStream("/path/to/local/file.txt");

await blockBlobClient.uploadStream(readStream, 4 * 1024 * 1024, 5, {
  // bufferSize: 4MB, maxConcurrency: 5
  onProgress: (progress) => console.log(`Uploaded ${progress.loadedBytes} bytes`),
});

Upload from Browser

const blockBlobClient = containerClient.getBlockBlobClient("browser-upload.txt");

// From File input
const fileInput = document.getElementById("fileInput") as HTMLInputElement;
const file = fileInput.files![0];
await blockBlobClient.uploadData(file);

// From Blob/ArrayBuffer
const arrayBuffer = new ArrayBuffer(1024);
await blockBlobClient.uploadData(arrayBuffer);

Download Blob

const blobClient = containerClient.getBlobClient("my-file.txt");
const downloadResponse = await blobClient.download();

// Read as string (browser & Node.js)
const downloaded = await streamToText(downloadResponse.readableStreamBody!);

async function streamToText(readable: NodeJS.ReadableStream): Promise<string> {
  const chunks: Buffer[] = [];
  for await (const chunk of readable) {
    chunks.push(Buffer.from(chunk));
  }
  return Buffer.concat(chunks).toString("utf-8");
}

Download to File (Node.js only)

const blockBlobClient = containerClient.getBlockBlobClient("my-file.txt");
await blockBlobClient.downloadToFile("/path/to/local/destination.txt");

Download to Buffer (Node.js only)

const blockBlobClient = containerClient.getBlockBlobClient("my-file.txt");
const buffer = await blockBlobClient.downloadToBuffer();
console.log(buffer.toString());

List Blobs

// List all blobs
for await (const blob of containerClient.listBlobsFlat()) {
  console.log(blob.name, blob.properties.contentLength);
}

// List with prefix
for await (const blob of containerClient.listBlobsFlat({ prefix: "logs/" })) {
  console.log(blob.name);
}

// List by hierarchy (virtual directories)
for await (const item of containerClient.listBlobsByHierarchy("/")) {
  if (item.kind === "prefix") {
    console.log(`Directory: ${item.name}`);
  } else {
    console.log(`Blob: ${item.name}`);
  }
}

Delete Blob

const blobClient = containerClient.getBlobClient("my-file.txt");
await blobClient.delete();

// Delete if exists
await blobClient.deleteIfExists();

// Delete with snapshots
await blobClient.delete({ deleteSnapshots: "include" });

Copy Blob

const sourceBlobClient = containerClient.getBlobClient("source.txt");
const destBlobClient = containerClient.getBlobClient("destination.txt");

// Start copy operation
const copyPoller = await destBlobClient.beginCopyFromURL(sourceBlobClient.url);
await copyPoller.pollUntilDone();

Blob Properties & Metadata

Get Properties

const blobClient = containerClient.getBlobClient("my-file.txt");
const properties = await blobClient.getProperties();

console.log("Content-Type:", properties.contentType);
console.log("Content-Length:", properties.contentLength);
console.log("Last Modified:", properties.lastModified);
console.log("ETag:", properties.etag);

Set Metadata

await blobClient.setMetadata({
  author: "John Doe",
  category: "documents",
});

Set HTTP Headers

await blobClient.setHTTPHeaders({
  blobContentType: "text/plain",
  blobCacheControl: "max-age=3600",
  blobContentDisposition: "attachment; filename=download.txt",
});

SAS Token Generation (Node.js only)

Generate Blob SAS

import {
  BlobSASPermissions,
  generateBlobSASQueryParameters,
  StorageSharedKeyCredential,
} from "@azure/storage-blob";

const sharedKeyCredential = new StorageSharedKeyCredential(accountName, accountKey);

const sasToken = generateBlobSASQueryParameters(
  {
    containerName: "my-container",
    blobName: "my-file.txt",
    permissions: BlobSASPermissions.parse("r"), // read only
    startsOn: new Date(),
    expiresOn: new Date(Date.now() + 3600 * 1000), // 1 hour
  },
  sharedKeyCredential
).toString();

const sasUrl = `https://${accountName}.blob.core.windows.net/my-container/my-file.txt?${sasToken}`;

Generate Container SAS

import { ContainerSASPermissions, generateBlobSASQueryParameters } from "@azure/storage-blob";

const sasToken = generateBlobSASQueryParameters(
  {
    containerName: "my-container",
    permissions: ContainerSASPermissions.parse("racwdl"), // read, add, create, write, delete, list
    expiresOn: new Date(Date.now() + 24 * 3600 * 1000), // 24 hours
  },
  sharedKeyCredential
).toString();

Generate Account SAS

import {
  AccountSASPermissions,
  AccountSASResourceTypes,
  AccountSASServices,
  generateAccountSASQueryParameters,
} from "@azure/storage-blob";

const sasToken = generateAccountSASQueryParameters(
  {
    services: AccountSASServices.parse("b").toString(), // blob
    resourceTypes: AccountSASResourceTypes.parse("sco").toString(), // service, container, object
    permissions: AccountSASPermissions.parse("rwdlacupi"), // all permissions
    expiresOn: new Date(Date.now() + 24 * 3600 * 1000),
  },
  sharedKeyCredential
).toString();

Blob Types

Block Blob (Default)

Most common type for text and binary files.

const blockBlobClient = containerClient.getBlockBlobClient("document.pdf");
await blockBlobClient.uploadFile("/path/to/document.pdf");

Append Blob

Optimized for append operations (logs, audit trails).

const appendBlobClient = containerClient.getAppendBlobClient("app.log");

// Create the append blob
await appendBlobClient.create();

// Append data
await appendBlobClient.appendBlock("Log entry 1\n", 12);
await appendBlobClient.appendBlock("Log entry 2\n", 12);

Page Blob

Fixed-size blobs for random read/write (VHDs).

const pageBlobClient = containerClient.getPageBlobClient("disk.vhd");

// Create 512-byte aligned page blob
await pageBlobClient.create(1024 * 1024); // 1MB

// Write pages (must be 512-byte aligned)
const buffer = Buffer.alloc(512);
await pageBlobClient.uploadPages(buffer, 0, 512);

Error Handling

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

try {
  await containerClient.create();
} catch (error) {
  if (error instanceof RestError) {
    switch (error.statusCode) {
      case 404:
        console.log("Container not found");
        break;
      case 409:
        console.log("Container already exists");
        break;
      case 403:
        console.log("Access denied");
        break;
      default:
        console.error(`Storage error ${error.statusCode}: ${error.message}`);
    }
  }
  throw error;
}

TypeScript Types Reference

import {
  // Clients
  BlobServiceClient,
  ContainerClient,
  BlobClient,
  BlockBlobClient,
  AppendBlobClient,
  PageBlobClient,

  // Authentication
  StorageSharedKeyCredential,
  AnonymousCredential,

  // SAS
  BlobSASPermissions,
  ContainerSASPermissions,
  AccountSASPermissions,
  AccountSASServices,
  AccountSASResourceTypes,
  generateBlobSASQueryParameters,
  generateAccountSASQueryParameters,

  // Options & Responses
  BlobDownloadResponseParsed,
  BlobUploadCommonResponse,
  ContainerCreateResponse,
  BlobItem,
  ContainerItem,

  // Errors
  RestError,
} from "@azure/storage-blob";

Best Practices

Use DefaultAzureCredential for local development; use ManagedIdentityCredential or WorkloadIdentityCredential for production
Use streaming for large files — uploadStream/downloadToFile for files > 256MB
Set appropriate content types — Use setHTTPHeaders for correct MIME types
Use SAS tokens for client access — Generate short-lived tokens for browser uploads
Handle errors gracefully — Check RestError.statusCode for specific handling
Use *IfNotExists methods — For idempotent container/blob creation
Close clients — Not required but good practice in long-running apps

Platform Differences

Feature	Node.js	Browser
`StorageSharedKeyCredential`	✅	❌
`uploadFile()`	✅	❌
`uploadStream()`	✅	❌
`downloadToFile()`	✅	❌
`downloadToBuffer()`	✅	❌
`uploadData()`	✅	✅
SAS generation	✅	❌
DefaultAzureCredential	✅	❌
Anonymous/SAS access	✅	✅

Files

ATTRIBUTION.mdAdded by AutoGineer982 B
LICENSELicence file added by AutoGineer1.1 KiB
SKILL.md12.8 KiB
references/sas-tokens.md12.7 KiB
references/streaming.md10.2 KiB

ATTRIBUTION.md

Attribution

This folder is an unmodified copy of the Agent Skill "azure-storage-blob-ts", distributed by AutoGineer (https://autogineer.com/agent-skills).

Source: https://github.com/microsoft/skills/tree/0696600436a9669184ce47e8d8b2ceac62e4bfac/.github/plugins/azure-sdk-typescript/skills/azure-storage-blob-ts
Commit: 0696600436a9669184ce47e8d8b2ceac62e4bfac
Created by: Microsoft (https://github.com/microsoft/skills/tree/0696600436a9669184ce47e8d8b2ceac62e4bfac/.github/plugins/azure-sdk-typescript/skills/azure-storage-blob-ts)
Publisher: Microsoft (https://github.com/microsoft)
Licence: MIT License (https://spdx.org/licenses/MIT.html)
Licence evidence: declared in the frontmatter ("license: MIT")
Retrieved: 2026-11-07

The skill's own files are unmodified copies. AutoGineer is not affiliated with or endorsed by the author or the publisher.

Files added by AutoGineer

ATTRIBUTION.md: this file, written by AutoGineer
LICENSE: copied from LICENSE

Requirements and compatibility

Works with: Claude Code, Claude apps, OpenAI Codex, GitHub Copilot, Cursor, Gemini CLI, Kiro, OpenCode, Goose, Amp, Roo Code, JetBrains Junie, Factory Droid, Devin (ex-Windsurf), Mistral Vibe, OpenHands, Letta

“Works with” means the tool reads the open Agent Skills format; a skill written for one tool may use features others lack.

Needs: Needs Node.js

Security

No issues found by our static scan· No issues found

A static scan is not a guarantee. Skills are third-party content: review a skill before you let an agent use it.

Attribution and licence

Created by

Microsoft

Publisher

Microsoft (Official)

Source

microsoft/skills · .github/plugins/azure-sdk-typescript/skills/azure-storage-blob-ts · commit 0696600

Licence

MIT License (redistribution allowed)

LICENSE (added by AutoGineer from LICENSE)
ATTRIBUTION.md (written by AutoGineer)

Synced

2026-11-09

AutoGineer is not affiliated with or endorsed by Microsoft or Microsoft.

Download ZIP

The ZIP holds the skill’s files, its licence files and an ATTRIBUTION.md. Download azure-storage-blob-ts.zip