12factor and dotenv for node
also
dotenv is also available for golang, php, python and ruby
# aptitude search dotenv
p golang-github-joho-godotenv-dev - Go port of Ruby's dotenv library p php-symfony-dotenv - .env files parser to make environment variables accessible p python3-dotenv - Get and set values in the .env file in local and production servers p ruby-dotenv - configuration variable loader