We announced
Loading Credentials in Node.js from Environment Variables
The SDK automatically detects AWS credentials set as variables in your environment and uses them for SDK requests, eliminating the need to manage credentials in your application. The environment variables that you set to provide your credentials are:
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AWS_ACCESS_KEY_ID
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AWS_SECRET_ACCESS_KEY
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AWS_SESSION_TOKEN
For more details on setting environment variables, see Environment variables support in the AWS SDKs and Tools Reference Guide.