{
    "first_name":   { "min_length": 3 },
    "last_name":    { "min_length": [4] },
    "middle_name": [{ "min_length": [5] }],
    "number1":    {"min_length": 2},
    "empty_name":   { "min_length": 3 },
    "missed_name":  { "min_length": 3 }
}