IOS - How to convert json string into object

use this code it will help you to convert your Response string

NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&err];

after getting values add received values in Dictionary then use it according to your need

NSData *data = [responseString dataUsingEncoding:NSUTF8StringEncoding];
NSLog(@"data1: %@",data);

NSError *error;
NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&error];
NSLog(@"Result = %@", dict);

if (error == nil) {

    if([dict valueForKey:@"result"]) {

        NSLog(@"%@", [[dict valueForKey:@"result"] objectAtIndex:0]);

        //you need to do loop to get all transcript data
        //NSArray *array = [[[dict valueForKey:@"result"] objectAtIndex:0] valueForKey:@"alternative"];

        NSString *transcript = [[[[[dict valueForKey:@"result"] objectAtIndex:0] valueForKey:@"alternative"] objectAtIndex:1] valueForKey:@"transcript"];

        NSLog(@"transcript = %@", transcript);
    }

} else {
    NSLog(@"Error = %@",error);
}

I hope it will help you.

You already have data as a parameter in your function

then why you convert it to string and back to data again

- (BOOL)didReceiveVoiceResponse:(NSData *)data
{
//    NSLog(@"data :%@",data);
//    NSError *jsonError = nil;
   NSError *error;

   NSDictionary  *json = [NSJSONSerialization JSONObjectWithData:data options:0  error:&error];
if (error == nil) {
    // no error
 NSLog(@"====%@",json);
 NSLog(@"%@",[json objectForKey:@"result"]);
} else {
    NSLog(@"error");
}

}

try this may be it will help you-

 NSData* jsonData = [yourJsonString dataUsingEncoding:NSUTF8StringEncoding];


    NSError *error = nil;
   NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&error];
NSLog(@"Result = %@", dict);

    if(! error) {
        NSArray *Array1 = [dict objectForKey:@"result"];
//now you will go inside dict having key "result"
        for (NSDictionary *dict2 in Array1) {
            NSArray *Array2 = [dict2 objectForKey:@"result"];
            for (NSDictionary *dict3 in Array2) {
                NSArray *array3 = [dict3 objectForKey:@"alternative"]);
for(NSDictionary *dict4 in array3)
NSLog(@"transcript--",[dict4 objectForKey:@"transcript"]);
            }
        }

    } else {
        NSLog(@"Error");
    }

your json string is not well formatted:

{"result":[]}
{"result":[{"alternative":[{"transcript":"free","confidence":0.63226712},    {"transcript":"we"}],"final":true}],"result_index":0}

this indicate that the two items should be in a array, but in you json string, they stand alone.

[
    {"result":[]},
    {"result":[{"alternative":[{"transcript":"free","confidence":0.63226712},{"transcript":"we"}],"final":true}],"result_index":0}
]

your code is ok, you can pass an error object into [NSJSONSerialization JSONObjectWithData:data2 options:0 error:nil]; to know what's the matter.

You have to use Object Class(Model Class) generator tool for iOS and Android both, just copy and paste your response and get Object Class from tool.

Its my Duplicate answer for my question but it's very useful.visit my question here

• Download JSON Accelerator from AppStore (Mac AppStore).

• Copy your JSON Responce from browser.(responce must be JSON Validated).

• paste in Json Accelerator >> Click Generate and Save With Your Modelname.

• Select Output language and add base Class name.(Class Prefix Not Required)
• See Below Generated Model Classes and SubModel Classe (It automatically generates All JSON Object Classes)

Use Like This >>> For Example Your JSON Respoce Dictionary is

{"employees":[
    {"firstName":"John", "lastName":"Doe"},
    {"firstName":"Anna", "lastName":"Smith"},
    {"firstName":"Peter", "lastName":"Jones"}
]}

• make Employee Array and then create Object With Created Model Classes like below code and you have to use For loop or enumerateObjectsUsingBlock any one for create and then Add in Mutable Array.

  NSArray *arrTemp = [NSArray arrayWithArray:yourResponceDict[@"employees"]];
  NSMutableArray *myMutableArray = [NSMutableArray array];
  
  [arrTemp enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
      Employee *aObj = [Employee modelObjectWithDictionary:obj];
      [myMutableArray addObject:aObj];
  }];
  

This Tool is Very easy and Time Saving For Creating Json Object Classes for parsing data anywhere in Development.

Try this code

- (BOOL)didReceiveVoiceResponse:(NSData *)data
        NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:0 error:NULL];
        NSLog(@"Dict=%@",dict);
}