.env.development.local [hot] | Premium Quality

The most critical concept in understanding .env.development.local is the order of precedence. The loading order is a cascade, where each subsequent file has the power to override the values set in the files that came before. The general rule for almost all modern frameworks (like Next.js and Create React App) is that the most specific and most local overrides always win.

# .env.example (committed to the repository) REACT_APP_API_BASE_URL= REACT_APP_GOOGLE_MAPS_API_KEY= DATABASE_URL=postgresql://user:password@localhost/db NEXT_PUBLIC_ANALYTICS_ID= .env.development.local

: A plain text file used to store environment variables (key-value pairs) so you don't have to hardcode sensitive data like API keys or database URLs. The most critical concept in understanding

Security is paramount when dealing with environment variables, and this is where understanding your framework's behavior is crucial. What is

(Highest priority for local dev overrides)

This article explores what .env.development.local is, how it fits into the environment variable hierarchy, why it is critical for security, and best practices for using it in your projects. What is .env.development.local ?