{
  "_main": {
    "DATA_ROOT": "https://${app_domain}/data",
    "APP_PREFIX": "${app_prefix}",
    "APP_NAME": "${app_name}",
    "SOURCE_PATH": "./src"
  },
  "development": {
    "NODE_ENV": "development",
    "SITE_ROOT": "http://localhost:4000"
  },
  "production": {
    "PORT": "4000",
    "NODE_ENV": "production",
    "SITE_ROOT": "https://${app_domain}"
  }
}