Error Domain=NSCocoaErrorDomain Code=3840 "Invalid escape sequence around character 746."

Question

I am getting this error

Error Domain=NSCocoaErrorDomain Code=3840 "Invalid escape sequence around character 746." UserInfo={NSDebugDescription=Invalid escape sequence around character 746.}

Here is my code to parse JSON:

NSString *strResponse = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
strResponse=[self stringByRemovingControlCharacters:strResponse];
NSData *jsonData =  [strResponse dataUsingEncoding:NSUTF8StringEncoding];
responseObject = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:&serializationError

Using this code I am getting response object in other API. but in my API contains HTML tags.

My issue is I am getting JSON string but it is not parsing in JSON. for this API I am getting error

"Error Domain=NSCocoaErrorDomain Code=3840".

My conclusion is that JSON is not parsing properly in above code.

@iYoung that is me.in that question i did not add any code.so i ask separate questio — Krutarth Patel, Dec 29 '16 at 06:22
Then why this separate question you must have updated that question. — iYoung, Dec 29 '16 at 06:23
I think your API doesn't return valid JSON or maybe some error in backend .. better to contact your backend developer — Bhavin Bhadani, Dec 29 '16 at 06:23
This is not at all a good practise to ask same question as 2 different question. You must edit your main question to add details. If you think you are not getting much attention try to give bounty to that question. — iYoung, Dec 29 '16 at 06:25
@KrutarthPatel I would suggest do that this time as well delete either of your question as this is not a good impression. — iYoung, Dec 29 '16 at 06:26
@Wolverine when i add response in json viewer.error showing in html string.and when i parse that html string in html viewer it is showing. but it is also showing \n\n. — Krutarth Patel, Dec 29 '16 at 06:43
can you please log **strResponse** value and add to question, By which we can see what things you should remove. Other wise no one's will able to help you... — Wolverine, Dec 29 '16 at 06:47
@KrutarthPatel Kindly add value of strResponse which you are parsing so that we can get to know where it is getting wrong. — iYoung, Dec 29 '16 at 06:53
@iYoung sorry i can't share response.but when i paste response in jsonlint.i am getting error at html value ."Expecting 'STRING', 'NUMBER', 'NULL', 'TRUE', 'FALSE', '{', '[', got 'undefined' " — Krutarth Patel, Dec 29 '16 at 07:28
http://stackoverflow.com/questions/28014855/json-wont-compile-gives-expecting-string-number-null-true-false — Krutarth Patel, Dec 29 '16 at 07:34
@iYoung can you check this question. so at least we can get conclusion.error is from backend or my side — Krutarth Patel, Dec 29 '16 at 07:35
unless you show the *strResponse* we cannot completely say that its a backend problem. so update the question and provide the *strResponse* — Joshua, Dec 29 '16 at 08:34
@KrutarthPatel I think you responce not json formatter some html tag available so the parser show error. You can change your serialisation method to `AFHTTPResponseSerializer`. I hope its helpful to you. Thanks — Ilesh P, Dec 29 '16 at 09:04
@ilesh i change. self.requestSerializer = [AFHTTPRequestSerializer serializer]; self.responseSerializer = [AFHTTPResponseSerializer serializer]; right? — Krutarth Patel, Dec 29 '16 at 09:12

score 0 · Answer 1 · answered Dec 29 '16 at 06:37

0

The string from Ur backend may be invalid JSON，it may contain "\s""\n""\t" or other tab character。And in Xcode u print it will not see the tab character,the console will not print them.You may get the JSON and find if there are tab characters.

answered Dec 29 '16 at 06:37

zacks

86
5

score 0 · Answer 2 · answered Jul 27 '23 at 07:37

0

NSJSONSerialization throw an error if you try to escape ” character using \”. Only " need to be escaped

answered Jul 27 '23 at 07:37

backspace83

342
4
10

Error Domain=NSCocoaErrorDomain Code=3840 "Invalid escape sequence around character 746."

2 Answers2