NSJSONSerialization

Syntax#

(id)JSONObjectWithData:(NSData *)data options:(NSJSONReadingOptions)opt error:(NSError * _Nullable *)error

Parameters#

Operator	Description
data	A data object containing JSON data
opt	Options for reading the JSON data and creating the Foundation objects.
error	If an error occurs, upon return contains an NSError object that describes the problem.

Remarks#

NSJSONSerialization is Available in iOS 5.0 and later An object that may be converted to JSON must have the following properties:

The top level object is an NSArray or NSDictionary.
All objects are instances of NSString, NSNumber, NSArray, NSDictionary, or NSNull.
All dictionary keys are instances of NSString.
Numbers are not NaN or infinity.

JSON Parsing using NSJSONSerialization Objective c

NSError *e = nil;
NSString *jsonString = @"[{\"id\": \"1\", \"name\":\"sam\"}]";
NSData *data = [jsonString dataUsingEncoding:NSUTF8StringEncoding];

NSArray *jsonArray = [NSJSONSerialization JSONObjectWithData: data options:  NSJSONReadingMutableContainers error: &e];

if (!jsonArray) {
    NSLog(@"Error parsing JSON: %@", e);
} else {
    for(NSDictionary *item in jsonArray) {
        NSLog(@"Item: %@", item);
    }
}

Output:

Item: {
    id = 1;
    name = sam;
}

Example 2:Using contents of url:

//Parsing:

NSData *data = [NSData dataWithContentsOfURL:@“URL HERE”];
NSError *error;
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
NSLog(@“json :%@”,json);

Sample response:

json: {
    MESSAGE = “Test Message";
    RESPONSE =(
                {
            email = "test@gmail.com";
            id = 15;
            phone = 1234567890;
            name = Staffy;
        }
    );
    STATUS = SUCCESS;
}


 NSMutableDictionary *response = [[[json valueForKey:@"RESPONSE"] objectAtIndex:0]mutableCopy];
 NSString *nameStr = [response valueForKey:@"name"];
 NSString *emailIdStr = [response valueForKey:@"email"];