!!install!! — .env.local.production

: Tells the framework to load these variables only when the app is running in a production environment (e.g., after running npm run build ).

Most modern frameworks follow a specific priority list when loading variables. If the same variable (like API_URL ) exists in multiple files, the framework chooses the "most specific" one. Generally, the order of priority looks like this: .env.local.production

Ensure your .gitignore includes *.local . You do not want this file in your GitHub repository. : Tells the framework to load these variables

Navigating Environment Variables: Why .env.local.production Matters .env.local.production