Dotenv is a lightweight module that loads environment variables from a .env file into your application's process. It promotes keeping configuration separate from code, following The Twelve-Factor App methodology. The article covers installation, usage, multiline values, comments, and advanced features like encryption and syncing with dotenvx.

Dotenvx is a secure, cross-platform environment variable manager that allows users to easily manage and encrypt their environment variables. It can be installed locally or globally, and supports multiple programming languages and frameworks, enabling seamless integration across different environments. The tool features capabilities for variable expansion, command substitution, and encryption of .env files.