{"cover":"http:\/\/files.domain.com\/some_file\/1234.jpg_thumb.png"}
This is my JSON code and when I tries to parse, it returns Unexpected Token error. I checked on http://jsonlint.com/ but it didn't go well.
I used php json_encode function to encode JSON.
++ update It works fine when I copy JSON string and paste it in Notepad or other plain text editors and re-copy that. I think it must be some encoding error or something. I'll try.