How to convert NSArray of NSStrings into Json String iOS

There is no need to use the following code snippets:

1. [rollArray componentsJoinedByString:@","]
2. NSString *str = [Self convertToJSONString:postDict];

You can create JSON by using the following code:

NSArray *rollArray = [NSArray arrayWithObjects:@"1", @"22", @"24", @"11", nil];NSMutableDictionary *postDict = [[NSMutableDictionary alloc]init];[postDict setValue:rollArray forKey:@"existingRoll"];NSData *jsonData = [NSJSONSerialization dataWithJSONObject:postDict options:0 error:nil];// Checking the formatNSLog(@"%@",[[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding]);

Try this :

NSDictionary *object = @{    @"existingRoll":@[@"22",@"34",@"45",@"56"],    @"deletedRoll":@[@"20",@"34",@"44",@"56"]};if ([NSJSONSerialization isValidJSONObject:object]) {    NSData* data = [ NSJSONSerialization dataWithJSONObject:object options:NSJSONWritingPrettyPrinted error:nil ];    NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];    NSLog(str);}

NSMutableDictionary *postDict = [[NSMutableDictionary alloc] init];    [postDict setValue:@"Login" forKey:@"methodName"];    [postDict setValue:@"admin" forKey:@"username"];    [postDict setValue:@"12345" forKey:@"password"];    [postDict setValue:@"mobile" forKey:@"clientType"];    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:postDict options:0 error:nil];    // Checking the format    NSString *urlString =  [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];    // Convert your data and set your request's HTTPBody property    NSString *stringData = [[NSString alloc] initWithFormat:@"jsonRequest=%@", urlString];    //@"jsonRequest={\"methodName\":\"Login\",\"username\":\"admin\",\"password\":\"12345\",\"clientType\":\"web\"}";    NSData *requestBodyData = [stringData dataUsingEncoding:NSUTF8StringEncoding];