send JSON object in POST request AFNetworking , iOS

Question

I'm using AFNetworking to post data into the web. The information I have is the URI which is baseURL/post_user_info and they want input as A JSON object containing each of the name-value pairs. In the code written below I've set the name-value pair in a dictionary. My question is how to make it's json and send it as input value?

NSString *string = [NSString stringWithFormat:@"%@?post_user_info",BaseURLString];
NSString *escapedPath = [string stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];

    NSDictionary *params = @{@"input_1": @"hello world",
                             @"input_2": @"my@you.com",
                             @"input_3": @"newworldorder"};
NSData* jsonData = [NSJSONSerialization dataWithJSONObject:params options:kNilOptions error:nil];

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setHTTPMethod:@"POST"];
[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
[request setHTTPBody:jsonData];

[manager POST:escapedPath parameters:[[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding] progress:nil success:^(NSURLSessionTask *task, id responseObject)
 {
     NSLog(@"%@",responseObject);
 }failure:^(NSURLSessionTask *operation, NSError *error)
 {
     NSLog(@"%@",[error localizedDescription]);
 }];

I've updated the code because now I have generated the JSON but if I run the code now it give me Error: 400 which means If input_values is empty, a bad request error will be output.

Answer 1

@interface AFJSONRequestSerializer : AFHTTPRequestSerializer

AFJSONRequestSerializeris a subclass ofAFHTTPRequestSerializerthat encodes parameters as JSON using NSJSONSerialization.

add this AFJSONRequestSerializer is used for send JSON not a Raw Data add this and try once

    manager.responseSerializer = [AFHTTPResponseSerializer serializer];
    manager.requestSerializer = [AFJSONRequestSerializer serializer];

e.g

NSString *string = [NSString stringWithFormat:@"%@?post_user_info",BaseURLString];
NSString *escapedPath = [string stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];

 /**************  karthik Code added  ******************/
 AFHTTPSessionManager* manager = [[AFHTTPSessionManager alloc] initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
 manager.responseSerializer = [AFHTTPResponseSerializer serializer];
 manager.requestSerializer = [AFJSONRequestSerializer serializer];
      /**************  karthik Code added  ******************/

    NSDictionary *params = @{@"1": @"hello world",
                             @"2": @"my@you.com",
                             @"3": @"newworldorder"};
[manager POST:escapedPath parameters:params progress:nil success:^(NSURLSessionTask *task, id responseObject)
     {
         NSLog(@"%@",responseObject);
          NSError *error = nil;
        NSDictionary *json = [NSJSONSerialization JSONObjectWithData:responseObject options:0 error:nil];
           NSLog(@"json == %@", json);

     } failure:^(NSURLSessionTask *operation, NSError *error) {
         NSLog(@"%@", [error localizedDescription]);
     }];

Update Params

NSDictionary *params = @{@"1": @"hello world",
                         @"2": @"my@you.com",
                         @"3": @"newworldorder"};
 NSMutableDictionary *modify = [NSMutableDictionary new];
[modify  setObject:params forKey:@"input_values"];

you get output of