Blob Storage — TypeScript SDK Quick Reference

Condensed from azure-storage-blob-ts. Full patterns (SAS generation, append/page blobs, streaming, browser uploads, error handling) in the azure-storage-blob-ts plugin skill if installed.

Install

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

Quick Start

import { BlobServiceClient } from "@azure/storage-blob";
import { DefaultAzureCredential } from "@azure/identity";
const client = new BlobServiceClient(`https://${accountName}.blob.core.windows.net`, new DefaultAzureCredential());

Best Practices

• Use DefaultAzureCredential for local development only — in production, use ManagedIdentityCredential. See auth-best-practices.md
• 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 — good practice in long-running apps