{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "type": "object",
    "properties": {
        "name": {
            "type": "string",
            "maxLength": 40
        },
        "email": {
            "type": "string",
            "maxLength": 60
        },
        "theme": {
            "type": "string",
            "maxLength": 40
        }
    },
    "required": [
        "name",
        "email",
        "theme"
    ],
    "additionalProperties": false
}