How to NSLog NSData JSON response in JSON format?

Question

Is there a way I can NSLog JSON response of NSData in JSONformat?

NSLog(@"JSON NSString: %@" ,jsonData);

In this post they are printing NSDictionary,I can convert it to NSDictionary. and this solution returns (null).

How can I NSLog in JSON format?

@Lamre jsonData is NSData. I need code to print it. I can convert it to NSDictionary but it can't be compared in codebeautify. — Shuvo Joseph, Aug 31 '16 at 10:00
if you've successfully converted the NSData to NSDictionary than there should be no problem in printing the dictionary try checking the error and try to access object at index or object for keys to check if they exist. — tryKuldeepTanwar, Aug 31 '16 at 10:33
@dreamBegin I can print the dictionary but can't use the data in codebeautify. — Shuvo Joseph, Aug 31 '16 at 11:07
Possible duplicate of [Convert UTF-8 encoded NSData to NSString](http://stackoverflow.com/questions/2467844/convert-utf-8-encoded-nsdata-to-nsstring) — Desdenova, Aug 31 '16 at 11:21
@ShuvoJoseph: You need to understand a thing or two. If you transform the NSData into a NSDictionary with NSJSONSerialization, and you print it, it will use the description method of NSDictionary. Not a "JSON" stuff. You need to use `initWithData:encoding:` — Larme, Aug 31 '16 at 11:25
If there is no "private" info in the JSON, can you give us the `NSData` object? — Larme, Aug 31 '16 at 11:32
@Larme I tried to comment here, but it's too big. Is there a way I can send you the NSData and NSDictionary? — Shuvo Joseph, Aug 31 '16 at 11:33
You can edit the question with it, or use pastern or other similar services. — Larme, Aug 31 '16 at 11:34
How did you get `jsonDictionary`? I tried some stuff from `jsonData`, and it seems that you use `NSKeyedArchiver`, trying to save the `NSDictionary` and not the JSON. — Larme, Aug 31 '16 at 12:14
NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:nil]; — Shuvo Joseph, Aug 31 '16 at 12:17
It shouldn't, since with the `jsonData` you gave, I can't have your result. — Larme, Aug 31 '16 at 12:27

score 1 · Accepted Answer · edited May 23 '17 at 12:08

• What's wrong:
jsonData (as you gave) IS NOT a hexData representing a JSON.

• Quick hack (not viable solution!) to get your JSON to use in your site CodeBeautify:

NSDictionary *dictFromData = [NSKeyedUnarchiver unarchiveObjectWithData:jsonData];
NSData *realJSONData = [NSJSONSerialization dataWithJSONObject:dictFromData options:0 error:nil];
NSString *strFINAL = [[NSString alloc] initWithData:realJSONData encoding:NSUTF8StringEncoding];
NSLog(@"StrFINAL: %@", strFINAL);

Note: Yeah, I bypassed the error parameters, and we shouldn't. With NSJSONWritingPrettyPrinted instead of 0 in options: parameter, you have a result almost similar to the one of CodeBeautify.

• How did I get there:
Firt, I copy/paste your bump string of NSData with this answer. That way, I got jsonData as you got. Then, I tried simply what it should be given your informations:

NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingAllowFragments error:&errorJSON];

Which didn't work giving the error:

Error Domain=NSCocoaErrorDomain Code=3840 "The operation couldn’t be completed. (Cocoa error 3840.)" (Invalid value around character 0.) UserInfo=0x17598540 {NSDebugDescription=Invalid value around character 0.}

But with NSDictionary *dictWithData = [NSKeyedUnarchiver unarchiveObjectWithData:jsonData];, I managed to get the real NSDictionary. But NSKeyedArchiver/NSKeyedUnarchiver are doing something "equivalent" to NSJSONSerialization: it serializes, transforming a NSObject into NSData (and vice-versa). But more powerful: for any kind of object that are NSCoding compliant. Here, since it's originally from a JSON (only NSString, NSNumber, NSArray and NSDictionary objects, and not a custom one), it's working without any more code. Did you for instance tried to save it into NSUserDefaults and it's not a .plist either (that was also one on my tries, I saved jsonData into memory, and used dictionaryWithContentsOfFile: giving me weird answer, but a important one in the bump of it: ""$class" = "{value = 23}";" which lead me to NSKeyArchiver/NSKeyUnarchiver). I don't know what you did exactly.

• Conclusion:
So clearly, somewhere, you mixed stuff found on the web. You need to rework that. You can't let it like this. There is issue in your code elsewhere. Where did you get jsonData from? What did you do with it?

I don't have the source code right now. I can try this when I get back to office on Sunday. The data is coming from .Net server. You are guru. — Shuvo Joseph, Aug 31 '16 at 17:39

score 0 · Answer 2 · edited Aug 31 '16 at 11:12

0

Code:

NSLog("Formatted JSON : %@" ,[[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding]);

edited Aug 31 '16 at 11:12

karan

3,319
1
35
44

answered Aug 31 '16 at 10:02

Max Martyniuk

19
3

score 0 · Answer 3 · answered Aug 31 '16 at 12:32

There are different situations. If parsing the JSON data was fine, then you just want to log the result (dictionary or array). If parsing the JSON data failed, and you suspect there is something wrong with the JSON data, then you convert the JSON data to an NSString and log that. And finally, if either conversion to NSString failed, or you look at the NSString and can't find what's wrong with it, then you log the NSData itself to be able to see the bytes. That's useful if someone managed to put control characters or some other nonsense into your JSON data.

The best is to write a method (warning! not for the timid! requires writing code yourself) that takes the NSData, analyses it and prints out the information that you need.

The issue is that the author is mixing too much stuff. For instance, with `jsonData` you can't retrieve "JSON" (as normally in 99,9% cases), but with `[NSKeyedUnarchiver unarchiveObjectWithData:jsonData]` you can. But he/she used `NSCoding` somewhere. — Larme, Aug 31 '16 at 12:57

How to NSLog NSData JSON response in JSON format?

3 Answers3