NSJSONSerialization does not return data, but its showing data in json viewer

Question

NSJSONSerialization returns null when i try to implement a particular api from the server, but other api's from the server works fine , when i tried the api in web it returns data of json type , and i have checked it in json viewer also , and it worked fine , NSData also returns some data, can Anyone help me get through it ?

NSString *urlString = @"url";        
NSURL *url = [NSURL URLWithString:urlString];
NSError *error = nil;
NSData *data = [NSData dataWithContentsOfURL:url];
_dict = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error];

if(error != nil){

    NSLog(@"JSON Error: %@", error);
    return;
}

I have tried the above written code.

---Edited----- Since it was a issue from server side as server was sending an Invalid Character along with response, In json validator it was passing but not in a actual Program , Hence closing the question.

thanks guys for your useful answers. actually the problem was with the server , they have added an invalid character in the json. — vinay, Jul 13 '13 at 16:45
I hav checked it using `[NSJSONSerialization isValidJson]` which tells weather the json returned is a valid one or not. — vinay, Jul 13 '13 at 16:47
I'm voting to close this question as off-topic because the problem was not in the code but in the server data coming as response. — vinay, Nov 15 '19 at 05:34

score 2 · Answer 1 · edited May 23 '17 at 12:05

2

The Problem is of Escape Sequences in your URL and you are not escaping them. You have to escape those sequences properly.

NSString *urlString = @"url";        
NSString *encodedString = [urlString stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSURL *url = [NSURL URLWithString:encodedString];

Take a Look at Documentation.
Check also the Escape Sequences.

Try this :

NSString *urlString = @"url";        
NSURL *myUrl = [NSURL URLWithString:[urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];

edited May 23 '17 at 12:05

Community

1
1

answered Jul 11 '13 at 13:14

Bhavin

27,155
11
55
94

@vinay.bn : If your URL is working in browser and not working in xcode then it is the problem of escape sequences only. Check the Documentation also. – Bhavin Jul 11 '13 at 13:26
@vinay.bn: Take a look at my Update Section. – Bhavin Jul 11 '13 at 13:32
:the url doesn't contain any escape character. – vinay Jul 11 '13 at 13:32
@vinay.bn: Just use that code in Update and let me know if it's working or not. – Bhavin Jul 11 '13 at 13:34
`NSString *s = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];` Use this line to fetch the data and then `NSLog` it. – Bhavin Jul 11 '13 at 13:43
@vinay.bn: What was the result of that `NSLog` ? – Bhavin Jul 11 '13 at 13:59
I encoded the data and it returns the desired result, but not able to get form the NSJsonserialization class... – vinay Jul 11 '13 at 14:17
@vinay.bn: What's the result that you are getting ? Is it an Error Message ? – Bhavin Jul 11 '13 at 14:21
when i try to read the nsdata through encoding it returns result as i xpected, but not able to get it form nsjsonserialization – vinay Jul 11 '13 at 14:47
:is there a way to parse json data without using nsserialization, bcoz i am getting data correct but not able to parse it using nsjsonsserialization – vinay Jul 11 '13 at 14:57
1

@vinay.bn: That means your JSON Data is not in proper format. – Bhavin Jul 12 '13 at 06:40
I am getting NSdata and if I encode the data i will get the nsstring of values, to check weather its problem in server return format I have tried in `http://jsonviewer.stack.hu` website and it returns the value which i need inthe format of json,probably it might be the problem in NSJSONSerialization. – vinay Jul 12 '13 at 12:25
`NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];` Try this way. I think the problem is in initialization of your Dictionary. – Bhavin Jul 13 '13 at 11:27
1

@vinary.bn Would you please mark the answer as correct? It is only fair that you give Vin the reps since he helped a lot and you solved you issue due to his help, so I think it would be more than appropriate after more than a month... – HAS Aug 17 '13 at 15:47

soryngod · Answer 2 · 2013-07-11T13:34:49.427

1

Make a NSURLConnection and request the JSON with NSURLRequest because I don't think the 'json' is an actual file that has content so you could use dataWithContentsOfURL:

edited Jul 11 '13 at 13:34

answered Jul 11 '13 at 13:10

soryngod

1,827
1
14
13

ya its get replaced by actual url , i tried switching that 0 into NSJSONReadingMutableContainers but same result. – vinay Jul 11 '13 at 13:20
Check the NSLog to see what you receive. – soryngod Jul 11 '13 at 13:21
i tried the NSlog option you have given, but it returns null, may i know what would be the reson , is it from server side or in my coding ? – vinay Jul 11 '13 at 13:29
I think you don't receive the NSData corectly , I think you should use NSURLConnnection and make a request to the server instead. – soryngod Jul 11 '13 at 13:29
1

It'll be the `XML Code` representing the `Error Message`. – Bhavin Jul 11 '13 at 13:42
@Vin Yeah, I figured out later the page isn't static – soryngod Jul 11 '13 at 13:43

NSJSONSerialization does not return data, but its showing data in json viewer

2 Answers2