Environment Variables

# .env file — KABHI git mein mat dalo!
# .gitignore mein add karo

NODE_ENV=development
PORT=3000

# Database
MONGODB_URI=mongodb://localhost:27017/myapp

# Authentication
JWT_SECRET=your-super-secret-key-min-32-chars
JWT_EXPIRES_IN=15m
REFRESH_TOKEN_SECRET=another-secret-key

# External APIs
GOOGLE_CLIENT_ID=...
GOOGLE_CLIENT_SECRET=...

# Email
SMTP_HOST=smtp.gmail.com
SMTP_PORT=587
SMTP_USER=your@gmail.com
SMTP_PASS=your-app-password

# .env.example — ye share karo (without values)
PORT=3000
MONGODB_URI=mongodb://localhost:27017/appname
JWT_SECRET=

// app.js ke top par — sab se pehle
require("dotenv").config();

// Access karo
const PORT = process.env.PORT || 3000;
const MONGO_URI = process.env.MONGODB_URI;

// Validate on startup — missing vars early catch karo
function validateEnv() {
  const required = ["JWT_SECRET", "MONGODB_URI", "NODE_ENV"];
  const missing = required.filter(key => !process.env[key]);
  
  if (missing.length > 0) {
    console.error("Missing env vars:", missing.join(", "));
    process.exit(1); // start mat karo
  }
}

validateEnv();