.env.development.local ❲UHD❳

: It is designed to override default settings found in .env or .env.development .

: Safely enable experimental features on your machine without forcing them on other developers. Best Practices Environment variables - Vercel .env.development.local

: Variables here only load when the application is running in "development" mode (e.g., via npm run dev or npm start ). The Hierarchy of .env Files : It is designed to override default settings found in

Tools like Next.js follow a strict load order to determine which variable takes precedence. Generally, the more specific a file is, the higher its priority: The Hierarchy of

By using .env.development.local , a developer can test features with their own unique database string or API key without affecting the rest of the team's shared .env.development file. Key Use Cases

: When working with third-party services like OpenAI, you can store your personal OPENAI_API_KEY here so it doesn't leak into the repository.