1# Blob Storage — TypeScript SDK Quick Reference
2 
3> Condensed from **azure-storage-blob-ts**. Full patterns (SAS generation,
4> append/page blobs, streaming, browser uploads, error handling)
5> in the **azure-storage-blob-ts** plugin skill if installed.
6 
7## Install
8npm install @azure/storage-blob @azure/identity
9 
10## Quick Start
11```typescript
12import { BlobServiceClient } from "@azure/storage-blob";
13import { DefaultAzureCredential } from "@azure/identity";
14const client = new BlobServiceClient(`https://${accountName}.blob.core.windows.net`, new DefaultAzureCredential());
15```
16 
17## Best Practices
18- Use DefaultAzureCredential for **local development only** — in production, use ManagedIdentityCredential. See [auth-best-practices.md](../auth-best-practices.md)
19- Use streaming for large files — `uploadStream`/`downloadToFile` for files > 256MB
20- Set appropriate content types — use `setHTTPHeaders` for correct MIME types
21- Use SAS tokens for client access — generate short-lived tokens for browser uploads
22- Handle errors gracefully — check `RestError.statusCode` for specific handling
23- Use `*IfNotExists` methods for idempotent container/blob creation
24- Close clients — good practice in long-running apps
25