.env.development Jun 2026

: Keeping development settings separate ensures that production secrets (API keys, database passwords, etc.) never accidentally leak into your codebase. The principle of "separation of concerns" here means developers can use different credentials locally without ever touching sensitive production data.

An application behaves differently depending on where it runs. For example: .env.development

This comprehensive guide explores everything you need to know about .env.development , how it works across various popular frameworks, and best practices for secure and efficient local environment management. What is .env.development? .env.development

Team members can copy this to .env.development.local and fill in their own values. .env.development