AWS SDK for JavaScript v3
Official AWS SDK for JavaScript and TypeScript (v3). Modular architecture where each AWS service is a separate npm package (@aws-sdk/client-s3, @aws-sdk/client-dynamodb, etc.) — import only what you need. Built with TypeScript-first design, native ESM support, middleware stack for custom behavior, and support for Node.js, browser, and React Native. Replaces the monolithic aws-sdk v2 package.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
TLS enforced for all AWS API calls. IAM roles preferred over static credentials. Fine-grained IAM policies. Modular design reduces dependency attack surface vs monolithic v2.
⚡ Reliability
Best When
You're building JavaScript or TypeScript applications (Node.js, browser, Lambda) that need to interact with AWS services — especially when bundle size matters thanks to modular imports.
Avoid When
You're using Python (use boto3) or need a single monolithic AWS SDK import pattern — v3's modular design requires separate imports per service.
Use Cases
- • Upload and download S3 objects from Node.js serverless functions or agents using @aws-sdk/client-s3 with stream support
- • Invoke Lambda functions and read responses from TypeScript agent orchestration code using @aws-sdk/client-lambda
- • Read/write DynamoDB tables with typed Item interfaces using @aws-sdk/client-dynamodb and @aws-sdk/lib-dynamodb
- • Send SQS messages and process queues in TypeScript event-driven agent pipelines using @aws-sdk/client-sqs
- • Call any of 300+ AWS services from browser-based applications with tree-shakeable imports that minimize bundle size
Not For
- • Python AWS access — use boto3 for Python; SDK v3 is JavaScript/TypeScript only
- • Multi-cloud abstraction — SDK v3 is AWS-specific; use cloud-agnostic SDKs for provider-independent code
- • Legacy aws-sdk v2 codebases without migration budget — v2 reaches EOL Sept 2025, but migration requires code changes
Interface
Authentication
Credentials resolved via credential provider chain: environment variables, shared credentials file, IAM instance/task roles, SSO. @aws-sdk/credential-providers package provides fromEnv(), fromIni(), fromInstanceMetadata(), fromSSO() helpers. IAM roles are best practice for production.
Pricing
Apache 2.0 licensed, free to use. AWS service call costs apply based on the service and usage.
Agent Metadata
Known Gotchas
- ⚠ V3 is modular — install @aws-sdk/client-s3 separately from @aws-sdk/client-dynamodb; agents must import from the correct service package, not a monolithic aws-sdk
- ⚠ Command pattern: all operations use send(new CommandClass(input)) — not service.operationName(); this is the primary v3 API change from v2
- ⚠ Pagination: use paginateXxx() helpers from @aws-sdk/client-*/pagination for full result sets — send() returns only first page
- ⚠ Credentials are resolved lazily — credential errors surface on first API call, not on client construction; always test credentials before production use
- ⚠ Region must be specified per client construction — no global default; cross-region calls need separate client instances with correct region
- ⚠ Middleware stack is powerful for cross-cutting concerns but complex — adding custom middleware requires understanding the handler chain structure and input/output types
Alternatives
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Scores are editorial opinions as of 2026-03-06.