.env.development.local

Add to .vscode/settings.json :

.env.development (committed): REACT_APP_API_URL=https://staging-api.example.com FEATURE_X=false

Next.js automatically loads environment variables from .env.development.local when you run next dev . Variables intended for the server look like: SECRET_KEY=123

: Specifies that these variables are only loaded when running the application in a local development environment (e.g., executing npm run dev or npm start ). .env.development.local

// The DATABASE_URL is now accessible ONLY on the server const DATABASE_URL = process.env.DATABASE_URL;

.env.development.local has become a widely accepted best practice for environment-specific configuration in software development. By adopting this approach, developers can ensure a clear separation of concerns, improve security, and facilitate collaboration. By following best practices, such as consistent naming conventions, separating sensitive information, and automating environment configuration, developers can maximize the benefits of using .env.development.local .

export const env = envSchema.parse(process.env); Add to

To maintain a clean and secure project repository, follow these industry best practices: 1. Double-Check Your .gitignore

// app/components/Analytics.tsx 'use client'; // This is a Client Component

: Ensure this file is listed in your .gitignore . Never commit it to a repository. By adopting this approach, developers can ensure a

Tools like dotenv have popularized the use of .env files to load these variables into process.env (or similar global objects), especially during local development. However, a single .env file quickly becomes insufficient for handling the nuances of multiple environments and individual developer preferences.

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