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Editorial Team
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Asked: 2026-05-31T22:38:24+00:00

I request a JSON response from a home controlling device: NSData* responseData = [NSData

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I request a JSON response from a home controlling device:

NSData* responseData = [NSData dataWithContentsOfURL:url];

The JSON data in responseData is complete and valid. However, if I try

NSDictionary* dict = [NSJSONSerialization 
                          JSONObjectWithData:responseData                          
                          options:kNilOptions 
                          error:&error];
NSLog("Error: %@", error);

it gives me the following error:

Error: Error Domain=NSCocoaErrorDomain Code=3840 “The operation couldn’t be completed. (Cocoa error 3840.)” (Duplicate key for object around character 0.) UserInfo=0x6a8b8e0 {NSDebugDescription=Duplicate key for object around character 0.}

I searched the web but couldn’t find anything helpful so far.

Edit: The JSON response it quite long, so instead of posting it here, please find it here.

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1 Answer

  1. Editorial Team

    It looks like the JSON is fine by pasting it into http://jsonformat.com/ – maybe you found an Apple bug? Another way to try and validate would be to use a third-party iOS library and see if it gives you the same error? Say, TouchJSON?

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