Parse JSON file using AFNetworking

Question

I have a link which contains the a json file. I mean if I launch that link in chrome a file is downloaded on my computer which is of .json extension. say the link is www.foffa.com/sampleList.json I am new to AFNetworking and not sure how to parse this json, with or without having to write this file down to the disk.

My code looks like below and I am pretty sure that I have to use streams and all for this but I am not sure how. As of now I get an error "Request failed: unacceptable content-type: text/plain" I guess it expects the content type to be "Content-Type" = "application/octet-stream";

    AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
    operation.responseSerializer = [AFHTTPResponseSerializer serializer];
    operation.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"application/octet-stream"];
    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
             NSLog(@"Data retrived");       
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {

        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Error Retrieving Weather"
                                                            message:[error localizedDescription]
                                                           delegate:nil
                                                  cancelButtonTitle:@"Ok"
                                                  otherButtonTitles:nil];
        [alertView show];
    }];

Content type of your response seems to be set to text/plain. Either you need to get it changed from your server side to the one you are accepting or you need to add text/plain as acceptable content types. — dispatchMain
– dispatchMain, Commented Jul 27, 2015 at 10:29

sbarow · Accepted Answer · 2015-07-27 11:35:08Z

2

Change the second line in this:

AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
operation.responseSerializer = [AFHTTPResponseSerializer serializer];

to this:

AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
operation.responseSerializer = [AFJSONResponseSerializer serializer];

Note you are using the AFJSONResponseSerializer response serialised.

Update

Updating my answer from info in the below comments, it appears you actually want to download a JSON file from a server and then parse it as opposed to parsing JSON directly from the HTTP response:

In order to do that change the content type to text/plain and with the downloaded file/data parse either as a String or a JSON object like this:

AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:nil];
operation.responseSerializer = [AFHTTPResponseSerializer serializer];
operation.responseSerializer.acceptableContentTypes =
    [NSSet setWithObjects:@"application/octet-stream", @"text/plain", nil];
[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
  NSError *error;
  id json = [NSJSONSerialization JSONObjectWithData:responseObject options:0 error:&error];
  if (error) {
      NSLog(@"Error: %@", error);
  } else {
      NSLog(@"JSON: %@", json);
  }
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {

  UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Error Retrieving Weather"
                                                      message:[error localizedDescription]
                                                     delegate:nil
                                            cancelButtonTitle:@"Ok"
                                            otherButtonTitles:nil];
  [alertView show];
}];

edited Jul 27, 2015 at 11:35

answered Jul 27, 2015 at 9:38

sbarow

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7 Comments

Ankit Srivastava Over a year ago

Yes... I think the idea here is to download the file first and then parse it. May be afnetworking can't do it on the fly

sbarow Over a year ago

I couldn't get that url to work when testing (404), so I tested with http://ip.jsontest.com and the above works but you need to change the expected type to application/json not application/octet-stream I would test with that http://ip.jsontest.com or some other valid JSON response vs the one you had as it seems the URL is forcing a download of that file.

Ankit Srivastava Over a year ago

can you give this in objective-c please.. I m not familiar with swift.

Ankit Srivastava Over a year ago

I was practically doing the same thing except for the @"text/plain" value in acceptable content types.. why do you thing it used to fail..?

sbarow Over a year ago

@AnkitSrivastava AFNetworking is pretty particular in the response it expects. You were saying that you are expecting a application/octet-stream response but in fact were getting a text/plain response so it was throwing an error saying you are getting the wrong type of data back.

|

Sergii Martynenko Jr · Accepted Answer · 2015-07-27 09:18:42Z

0

AFNetwroking won't parse income data for you.

Use NSJSONSerialization's class method +JSONObjectWithData:options:error:. If your data is valid, result will be NSDictionary with same structure as original JSON file

You should place it inside success block

answered Jul 27, 2015 at 9:18

Sergii Martynenko Jr

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