(Highest priority for local development) .env.local .env.development .env (Lowest priority; general defaults)
: It is designed to override default settings found in .env or .env.development .
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 .env.development.local
Managing configuration across different environments is a cornerstone of modern web development. While standard .env files are common, the specifically named plays a critical role in local workflows, particularly within ecosystems like Next.js and Create React App . What is .env.development.local ?
: Safely enable experimental features on your machine without forcing them on other developers. Best Practices Environment variables - Vercel (Highest priority for local development)
: It is strictly for local use and should never be committed to version control (Git).
: If you are running a local instance of MongoDB or PostgreSQL, you can define your DATABASE_URL here. While standard
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: