{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "type": "object",
  "properties": {
    "key": {
      "type": "string",
      "minLength": 1,
      "maxLength": 255
    },
    "value": {}
  },
  "additionalProperties": false,
  "required": [
    "key"
  ]
}