: The base file extension used by tools like dotenv to load key-value pairs into your application's environment (e.g., process.env in Node.js).

To get the most out of .env.development.local , follow these best practices:

Enabling a specific experimental feature on one developer's machine without affecting the rest of the team. Security and Best Practices

Environment variables are injected into your application when the process starts. If you modify a value inside .env.development.local , the changes will not take effect automatically through hot-module reloading. You your development server (e.g., cancel the terminal process and run npm run dev again). Pitfall 3: Mixing Client and Server Secrets

# Local environment files .env.local .env.development.local .env.test.local .env.production.local Use code with caution. Step 2: Create a Template File ( .env.example )

How do I use an env file with GitHub Actions? - Stack Overflow

It allows you to override default settings (defined in .env.development or .env ) without changing the code for other team members [3jop].

Because .env.development.local is not committed, new developers won't have it. Create a .env.example or a README.md that lists what keys a developer should place in their local file.