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