The AWS SDK for JavaScript V3 API Reference Guide describes in detail all the API operations for the AWS SDK for JavaScript version 3 (V3).

Create and call service objects

The JavaScript API supports most available AWS services. Each service in the JavaScript API provides a client class with a send method that you use to to invoke every API the service supports. For more information about service classes, operations, and parameters in the JavaScript API, see the API Reference.

When using the SDK in Node.js, you add the SDK package for each service you need to your application using import, which provides support for all current services. The following example creates an Amazon S3 service object in the us-west-1 Region.

// Import the Amazon S3 service client
import { S3Client } from "@aws-sdk/client-s3"; 
// Create an S3 client in the us-west-1 Region
const s3Client = new S3Client({
    region: "us-west-1"
  });

Specify service object parameters

When calling a method of a service object, pass parameters in JSON as required by the API. For example, in Amazon S3, to get an object for a specified bucket and key, pass the following parameters to the GetObjectCommand method from the S3Client. For more information about passing JSON parameters, see Work with JSON.

s3Client.send(new GetObjectCommand({Bucket: 'bucketName', Key: 'keyName'}));

For more information about Amazon S3 parameters, see @aws-sdk/client-s3 in the API Reference.