AWS Lambda Supports Environment Variables

You can now set environment variables for your Lambda functions, making it easy for you to configure your code for development, test, and production without having to change the function’s implementation. You can provide key-value pairs as part of your function configuration and access them easily within your function code at execution time simply by reading environment variables. You can easily create and modify environment variables from the AWS Lambda Console, CLI or SDKs.  
Quelle: aws.amazon.com