Automated CORS Configuration

For applications with dynamic CORS requirements, you might use environment variables or configuration files to manage allowed origins and settings.

const allowedOrigins = process.env.ALLOWED_ORIGINS.split(',');

const corsOptions = {
  origin: (origin, callback) => {
    if (allowedOrigins.includes(origin) || !origin) {
      callback(null, true);
    } else {
      callback(new Error('Not allowed by CORS'));
    }
  },
};