Error

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/postalcodes-info/main/json-schema/postalcodes-info-error-schema.json",
  "title": "Error",
  "description": "Minimal error envelope returned by PostalCodes.info JSON endpoints.",
  "type": "object",
  "properties": {
    "error": {
      "type": "string",
      "description": "Human-readable error message."
    }
  },
  "required": ["error"],
  "additionalProperties": false
}