Get a value from an environment variable

To get the value of an environment variable, use code like the following. This code gets the value of the environment variable MYBUCKET.

TypeScript

// Sets bucket_name to undefined if environment variable not set
var bucket_name = process.env.MYBUCKET;

// Sets bucket_name to a default if env var doesn't exist
var bucket_name = process.env.MYBUCKET || "DefaultName";

JavaScript

// Sets bucket_name to undefined if environment variable not set
var bucket_name = process.env.MYBUCKET;

// Sets bucket_name to a default if env var doesn't exist
var bucket_name = process.env.MYBUCKET || "DefaultName";

Python

import os

# Raises KeyError if environment variable doesn't exist
bucket_name = os.environ["MYBUCKET"]
        
# Sets bucket_name to None if environment variable doesn't exist
bucket_name = os.getenv("MYBUCKET")

# Sets bucket_name to a default if env var doesn't exist
bucket_name = os.getenv("MYBUCKET", "DefaultName")

Java

// Sets bucketName to null if environment variable doesn't exist
String bucketName = System.getenv("MYBUCKET");

// Sets bucketName to a default if env var doesn't exist
String bucketName = System.getenv("MYBUCKET");
if (bucketName == null) bucketName = "DefaultName";

C#

using System;

// Sets bucket name to null if environment variable doesn't exist
string bucketName = Environment.GetEnvironmentVariable("MYBUCKET");

// Sets bucket_name to a default if env var doesn't exist
string bucketName = Environment.GetEnvironmentVariable("MYBUCKET") ?? "DefaultName";