
About
Azure Blob Storage JavaScript/TypeScript SDK (@azure/storage-blob) for blob operations. Use for uploading, downloading, listing, and managing blobs and containers.
name: azure-storage-blob-ts description: Azure Blob Storage JavaScript/TypeScript SDK (@azure/storage-blob) for blob operations. Use for uploading, downloading, listing, and managing blobs and containers. risk: unknown source: community date_added: '2026-02-27'
@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=...
Authentication
DefaultAzureCredential (Recommended)
import { BlobServiceClient } from "@azure/storage-blob";
import { DefaultAzureCredential } from "@azure/identity";
const accountName = process.env.AZURE_STORAGE_ACCOUNT_NAME!;
const client = new BlobServiceClient(
`https://${accountName}.blob.core.windows.net`,
new DefaultAzureCredential()
);
Connection String
import { BlobServiceClient } from "@azure/storage-blob";
const client = BlobServiceClient.fromConnectionString(
process.env.AZURE_STORAGE_CONNECTION_STRING!
);
StorageSharedKeyCredential (Node.js only)
import { BlobServiceClient, StorageSharedKeyCredential } from "@azure/storage-blob";
const accountName = process.env.AZURE_STORAGE_ACCOUNT_NAME!;
const accountKey = process.env.AZURE_STORAGE_ACCOUNT_KEY!;
const sharedKeyCredential = new StorageSharedKeyCredential(accountName, accountKey);
const client = new BlobServiceClient(
`https://${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).toS
Compatible Tools
Claude CodeCursor
Tags
Backend
