Frameworks like Next.js and tools like dotenv-flow support multiple .env files. Understanding the hierarchy and execution order prevents unexpected configuration bugs. Should It Be Committed to Git? .env Default values for all environments. .env.development Values specific to the development environment. .env.production Values specific to the production build. Local overrides for all environments. NO (Never commit this file) .env.development.local Local overrides specifically for development. NO .env.production.local Local overrides specifically for production. NO The Priority Hierarchy
Since .env.local is ignored, how do other developers know what variables your application needs to run?
If you are using platforms like Vercel, you can use their CLI commands (e.g., vercel env pull ) to automatically generate a local file with the correct development variables. js or Python ? .env.local
: Frameworks use .env.local to override default values set in a shared .env file.
To get the most out of your environment variables and keep your application secure, follow these industry-standard workflows. 1. Never Commit .env.local to Git Frameworks like Next
Are you trying to share non-sensitive environment variables across a ?
The .env.local file is an indispensable tool for local web development. It allows you to customize your local runtime environment safely, keeps sensitive credentials out of source control, and ensures seamless collaboration across development teams when paired with a .env.example file. Local overrides for all environments
In modern software development, keeping configuration separate from application code is a core architectural principle. The twelve-factor app methodology explicitly states that an application’s configuration should be stored in the environment.
To ensure .env.local takes priority over a standard .env file in vanilla Node, you can configure dotenv manually: javascript
DB_HOST=prod-db-host DB_PORT=5432 API_KEY=YOUR_PROD_API_KEY
By default, modern frameworks like Next.js and Vercel automatically add .env.local to the .gitignore file to prevent accidental leaks.