Converting `NSString` to proper JSON format..

```
NSString *input_json = [NSString stringWithFormat:@"{\"id\":\"%@\",\"seconds\":\"%d\",\"buttons\": \"%@\"}", reco_id, interactionTime, json_Buttons];

```

Here `json_Button` is in json format converted from nsdictionary..

My input\_json result is:

```

{"id":"119","seconds":"10","buttons": "{
  "update" : "2",
  "scan" : "4"
}"}

```

It is not in a proper JSON format. key buttons contain "{}" I want to remove these quotes.

Expected Result is:

```

{
    "id": "119",
    "seconds": "10",
    "buttons": {
        "update": "2",
        "scan": "4"
    }
}

```