php - json parsing failed - cocoa error 3840 and invalid value around character 0

Solution:

Updated answer:

I think now that you have posted the Objective-C code that uses this received JSON, it becomes clear what the actual problem is.

It sounds to me that you are using Core Data (PersonStore) to persist your incoming data.

If you are making Core Data calls from the same thread thatconnectionDidFinishLoading: is being called on, you are most likely running into a threading issue where Core Data is not happy that you call it from a thread other than the main thread.

Give this a try: in yourconnectionDidFinishLoading: wrap your code in the following:

dispatch_async(dispatch_get_main_queue(), ^{
    // Include the code here that walks over the incoming JSON
    // and creates new `Person` instances.
});
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This will execute everything in that block, on the main thread. Which is generally a good idea for Core Data usage. (Probably even required, check the documentation, there is a special section on Core Data & Threads if I remember correctly).

Very curious if this does the trick.

Old answer:

The output ofvardump is not actually valid JSON. You need to use thejson_encode() function instead.

You can turn theNSData that you received from the server into a string by doing something like this:

if let s = String(data: data, encoding: NSUTF8StringEncoding) {
    println(s)
}
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You did not mention if you work in Swift or Objective-C but the above translates easily to Objective-C.

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