{
    "user": {
        "name": "koorchik",
        "age1": 20,
        "age2": 40,
        "extra_field": "som value"
    },
    "user_custom_error": {
        "name": "koorchik",
        "age1": 33,
        "age2": 22
    },
    "extra_field": 12
}