{
  "app": {
    "name": "my-app",
    "port": 8080,
    "environment": "staging"
  },
  "database": {
    "host": "staging-db.example.com",
    "port": 5432,
    "name": "staging_db",
    "user": "${DB_USER}",
    "password": "${DB_PASSWORD}"
  },
  "api": {
    "base_url": "https://staging-api.example.com",
    "timeout": 8000,
    "retries": 3
  },
  "logging": {
    "level": "warn",
    "format": "json",
    "output": "console"
  },
  "monitoring": {
    "enabled": true,
    "metrics": {
      "port": 9090,
      "path": "/metrics"
    }
  }
}