{
    "type": "object",
    "properties": {
        "user": {
            "type": "string"
        },
        "roomId": {
            "type": "number"
        },
        "text": {
            "type": "string"
        },
        "html": {
            "type": "string"
        }
    },
    "required": [
        "user", "roomId", "text", "html"
    ],
    "additionalProperties": false
}