JSON

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{

    [mdata  setLength:0];

}

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{

    [mdata appendData:data];

}

-(void)connectionDidFinishLoading:(NSURLConnection *)connection{

    NSError *err;

    NSString *str=[[NSJSONSerialization JSONObjectWithData:mdata options:-1 error:&err] description];

    //NSLog(@"%@",err.localizedDescription);

  t1.text=str;

 NSLog(@"Succeeded! Received %d bytes of data",[mData length]);//Bytes Received

   NSLog(@"The received data are%@",mData); 

}

- (IBAction)click:(id)sender {

    NSMutableURLRequest *request=[NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https://www.googleapis.com/youtube/v3/videos"]];

    

    NSURLConnection *connection=[NSURLConnection connectionWithRequest:request delegate:self];

    if(connection)

    {

        mdata=[NSMutableData data];

        [connection start];

    }

}