```
item = {
    "obj": TabellaDettagliataVoceSingola
}

$.ajax({
    url: "/Richieste/SalvaDatiPreventivo",
    contentType: 'application/json',
    type: "POST",
    data: JSON.stringify(item),
    success: function (response) {
    },
    complete: function (response) {
    },
    fail: function (response) {
    }
})

```

This is the code with a problem: json stringify return "object object" because the parameter that I pass to json stringify is an object. Then how can I do for return the records of the object instead "object object"?