.env.development.local [2021] (PLUS | 2025)

: Indicates that the file contains environment variables written in a key-value pair format.

: .env.local is loaded in all environments (except test), while .env.development.local is loaded only when NODE_ENV=development . If your server is not explicitly in development mode (or if NODE_ENV is misconfigured), .env.development.local may be ignored. Use .env.local for truly universal local overrides, and .env.development.local for overrides that should apply only during development.

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From (overrides everything) to lowest priority (fallback defaults), the standard loading order during local development is:

Environment variables are key-value pairs used to configure applications without hardcoding values into the source code. They typically store database connection strings, API keys, authentication secrets, feature flags, and service endpoints. The Twelve-Factor App methodology advocates for storing configuration in the environment to maintain portability, security, and flexibility across different deployment stages. .env.development.local

Vite uses dotenv under the hood.

To maintain a clean and secure project repository, follow these industry best practices: 1. Double-Check Your .gitignore : Indicates that the file contains environment variables

Because this file houses your personal secrets and system-specific paths, committing it creates a massive security vulnerability. Before you write a single line of code inside it, ensure your project's .gitignore file includes the following pattern:

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# .env.development.local DATABASE_URL="postgresql://myuser:mypassword@localhost:5432/myapp_dev" NEXT_PUBLIC_ANALYTICS_ID="G-DEV123ABC"