Retrieve cities informations from a string / build an autocomplete

{
  "type": "object",
  "properties": {
    "countrycode": {
      "type": "string"
    },
    "language": {
      "type": "string"
    },
    "q": {
      "type": "string"
    },
    "sort": {
      "type": "string"
    }
  },
  "required": [
    "language",
    "q",
    "sort"
  ],
  "additionalProperties": false
}