JSON Parse Error

Question

I am using SBJson framework (also known as json-framework) for the iOS.

When parsing a certain JSON file, I am getting the following error: -JSONValue failed. E

Answer 1

Have a look at http://www.json.org/ There are some characters that need to be escaped to be properly parsed by JSON. This is the cause. The file is not proper JSON.

Answer 2

I have a great solution for it. Apply this method for remove escaped characters.

-(NSString *)removeUnescapedCharacter:(NSString *)inputStr
{

NSCharacterSet *controlChars = [NSCharacterSet controlCharacterSet];

NSRange range = [inputStr rangeOfCharacterFromSet:controlChars];

  if (range.location != NSNotFound) 
  {

      NSMutableString *mutable = [NSMutableString stringWithString:inputStr];

      while (range.location != NSNotFound) 
      {

          [mutable deleteCharactersInRange:range];

          range = [mutable rangeOfCharacterFromSet:controlChars];

      }

      return mutable;

   }

  return inputStr;
}

Call this method with passing your output string like this

NSString *output = [NSString stringWithContentsOfURL:[NSURL URLWithString:@"yourUrlString"] encoding:NSUTF8StringEncoding error:nil];

output = [self removeUnescapedCharacter:output];

Answer 3

If your file is having '\n' or '\r' kind of html qoutes then it may cause error in obj-c. You can add :

[jsonString stringByReplacingOccurrencesOfString:@"\r\n" withString:@"<br />"]

I was having same problem and solved using this.

Answer 4

I guess your file contain an unencoded tab (ascii 0x09) that should be replaced with \t according to the json grammar.