Retrieving Lambda environment variables

To retrieve environment variables in your function code, use the standard method for your programming language.

Node.js

let region = process.env.AWS_REGION

Python

import os
  region = os.environ['AWS_REGION']

Note

In some cases, you may need to use the following format:

region = os.environ.get('AWS_REGION')

Ruby

region = ENV["AWS_REGION"]

Java

String region = System.getenv("AWS_REGION");

Go

var region = os.Getenv("AWS_REGION")

C#

string region = Environment.GetEnvironmentVariable("AWS_REGION");

PowerShell

$region = $env:AWS_REGION

Lambda stores environment variables securely by encrypting them at rest. You can configure Lambda to use a different encryption key, encrypt environment variable values on the client side, or set environment variables in an AWS CloudFormation template with AWS Secrets Manager.