{
  "type": "object",
  "properties": {
    "limit": {
      "type": ["number", "string"]
    },
    "prefix": {
      "type": "string"
    },
    "mimetype": {
      "type": "string"
    },
    "encoding": {
      "type": "string"
    }
  },
  "additionalProperties": true
}