REACT_APP_API_URL=https://api.myapp.com REACT_APP_DEBUG=false REACT_APP_APP_NAME=MyApp
Add the following patterns to your .gitignore file immediately when starting a project:
: Environment variables in Create React App are embedded at build time , not runtime. If you change your .env files, you need to restart your development server for changes to take effect. .env.development
Your defined environment variables aren't accessible in the application.
A replica of the production system used for final Quality Assurance (QA). Production: The live application used by real customers. REACT_APP_API_URL=https://api
A .env.development file is a plain text file located in the root of a project. It is used to define environment variables that are only active when the application is running in the environment.
// Express.js server example const port = process.env.PORT || 3000; const dbUrl = process.env.DATABASE_URL; app.listen(port, () => console.log(`Server running on port $port`); ); Use code with caution. Frontend Environments (Vite, Webpack, Next.js) A replica of the production system used for
PORT=3000 DATABASE_URL=mongodb://localhost:27017/dev_db API_KEY=your_test_key_here DEBUG=true Use code with caution. Copied to clipboard