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// Install dotenv: // npm install dotenv // .env file (add to .gitignore!): // PORT=3000 // DB_HOST=localhost // DB_PORT=5432 // DB_NAME=myapp // DB_USER=admin // DB_PASS=supersecret // JWT_SECRET=my_super_secret_key // NODE_ENV=development // app.js — load .env at the top: require('dotenv').config(); const PORT = process.env.PORT || 3000; const DB_HOST = process.env.DB_HOST || 'localhost'; const NODE_ENV = process.env.NODE_ENV || 'development'; console.log(`Environment: ${NODE_ENV}`); console.log(`DB: ${DB_HOST}`); // Validate required env vars at startup: const required = ['DB_HOST', 'DB_USER', 'DB_PASS', 'JWT_SECRET']; for (const key of required) { if (!process.env[key]) { console.error(`Missing required env var: ${key}`); process.exit(1); } } // .gitignore — always include: // .env // .env.local // .env.*.local
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