JSONKit Parsing Nested JSON with Objective-C - objective-c

Question

I am trying to parse my nested JSON with JSONKit and the 2nd level JSON isn't being parsed correctly.
Here's sample JSON...
{
"app": {
"content": "[{\\\"Id\\\":\\\"1\\\",\\\"Name\\\":\\\"John\\\"},{\\\"Id\\\":\\\"2\\\",\\\"Name\\\":\\\"John\\\"}]"
}
}
and Here's my code...
NSString *jsonString = "...long nested json string...";
NSDictionary *jsonParsed = [jsonString objectFromJSONString];
NSString *content = [[jsonParsed objectForKey:#"app"] objectForKey:#"content"];
NSDictionary *jsonContent = [content objectFromJSONString];
NSLog(#"%#", jsonContent);
Where am I going wrong?

Answer 1

This is quite easy to answer: You are escaping \ as well as ". So your result in the NSString* content will be \". This is something your JSON parser won't digest. So use instead of \\\" this \".

Answer 2

If you replace the content string with following:
"[{\"Id\":\"1\",\"Name\":\"John\"},{\"Id\":\"2\",\"Name\":\"John\"}]"
It will be parsed correctly.
JSON.parse("[{\"Id\":\"1\",\"Name\":\"John\"},{\"Id\":\"2\",\"Name\":\"John\"}]")
>>> [Object { Id="1", Name="John"}, Object { Id="2", Name="John"}]
Maybe you have escaped the content string twice at somewhere in your code.
I just used firebug to see if the JSON was correct. JSONKit is the same:
clowwindy:~ clowwindy$ cat /tmp/input.txt
{
"app": {
"content": "[{\"Id\":\"1\",\"Name\":\"John\"},{\"Id\":\"2\",\"Name\":\"John\"}]"
}
}
NSError *error;
NSString *input = [NSString stringWithContentsOfFile:#"/tmp/input.txt" encoding:NSUTF8StringEncoding error:&error];
NSString *jsonString = input;
NSDictionary *jsonParsed = [jsonString objectFromJSONString];
NSString *content = [[jsonParsed objectForKey:#"app"] objectForKey:#"content"];
NSDictionary *jsonContent = [content objectFromJSONString];
NSLog(#"%#", jsonContent);
NSLog(#"%#", content);
2012-01-02 00:26:39.818 testjson[12700:707] (
{
Id = 1;
Name = John;
},
{
Id = 2;
Name = John;
}
)
2012-01-02 00:26:39.822 testjson[12700:707] [{"Id":"1","Name":"John"},{"Id":"2","Name":"John"}]