The SDK was first made available last December in a preview form, but has now been released to General Availability (GA). According to the Amazon Web Services blog, Amazon has added a number of features since the preview release including bound parameters, streams, IAM roles for EC2 instances, version locking, and proxies.
Bound parameters make it easier to create a service object that is bound to a specific resource, while version locking means you can lock service objects to specific API versions, so ensuring the service behaves the same in a production app even if the API version changes.
Using the SDK means you can write apps that work with a wide range of Amazon cloud services such as Relational Database Service (RDS), and the Virtual Private Cloud that lets you create logically isolated virtual servers. The release of the SDK for Node.js follows the recent release of Elastic Beanstalk for Node.js. Elastic Beanstalk provides a simple way to deploy and manage applications in the AWS cloud.
The AWS SDK for Node.js can be installed using the npm package manager for Node.js and there’s a developer guide with code samples.