title: Fail to serialize JSON Objective-c
body: <p>I have a problem. When I try to make test my json, it says that it is not valid. But when I test it with online services, it reads it well.</p>
  
  <p>The code I use to test if json is valid is:</p>
  
  <pre><code>NSString* stringRes = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
  [NSJSONSerialization isValidJSONObject:stringRes];
  </code></pre>
  
  <p>Where stringRes is son string in NSString format.(From data response)
  JSON :</p>
  
  <pre><code>{
  "response": [
  9,
  {
    "id": 47,
    "from_id": 211551056,
    "to_id": -101815039,
    "date": 1442585775,
    "post_type": "post",
    "text": "Кто на андроид кодит хоть немножк ? Хотя бы hello world ?",
    "can_edit": 1,
    "created_by": 211551056,
    "can_delete": 1,
    "post_source": {
      "type": "api",
      "platform": "iphone"
    },
    "comments": {
      "count": 0,
      "can_post": 1
    },
    "likes": {
      "count": 0,
      "user_likes": 0,
      "can_like": 1,
      "can_publish": 0
    },
    "reposts": {
      "count": 0,
      "user_reposted": 0
    },
    "online": 1,
    "reply_count": 0
  },
  {
    "id": 43,
    "from_id": 217702824,
    "to_id": -101815039,
    "date": 1442555658,
    "post_type": "post",
    "text": "Учебник по географии",
    "can_delete": 1,
    "attachment": {
      "type": "doc",
      "doc": {
        "did": 419802605,
        "owner_id": 217702824,
        "title": "11_geo_m_2012.pdf",
        "size": 92318316,
        "ext": "pdf",
        "url": "http://vk.com/doc217702824_419802605?hash=5eb9bb9753a6f88e88&amp;dl=fcadca27db5845a002&amp;api=1",
        "access_key": "8e4218746055687cc2"
      }
    },
    "attachments": [
      {
        "type": "doc",
        "doc": {
          "did": 419802605,
          "owner_id": 217702824,
          "title": "11_geo_m_2012.pdf",
          "size": 92318316,
          "ext": "pdf",
          "url": "http://vk.com/doc217702824_419802605?hash=5eb9bb9753a6f88e88&amp;dl=fcadca27db5845a002&amp;api=1",
          "access_key": "8e4218746055687cc2"
        }
      }
    ],
    "post_source": {
      "type": "api",
      "platform": "android"
    },
    "comments": {
      "count": 0,
      "can_post": 1
    },
    "likes": {
      "count": 3,
      "user_likes": 0,
      "can_like": 1,
      "can_publish": 0
    },
    "reposts": {
      "count": 0,
      "user_reposted": 0
    },
    "online": 0,
    "reply_count": 0
  },
  {
    "id": 37,
    "from_id": 211551056,
    "to_id": -101815039,
    "date": 1442502437,
    "post_type": "post",
    "text": "У кого айфон, + в комменты",
    "can_delete": 1,
    "attachment": {
      "type": "poll",
      "poll": {
        "poll_id": 195892301,
        "question": "Удобно смотреть расписание ?(На сайте)"
      }
    },
    "attachments": [
      {
        "type": "poll",
        "poll": {
          "poll_id": 195892301,
          "question": "Удобно смотреть расписание ?(На сайте)"
        }
      }
    ],
    "post_source": {
      "type": "api",
      "platform": "iphone"
    },
    "comments": {
      "count": 5,
      "can_post": 1
    },
    "likes": {
      "count": 0,
      "user_likes": 0,
      "can_like": 1,
      "can_publish": 0
    },
    "reposts": {
      "count": 0,
      "user_reposted": 0
    },
    "online": 1,
    "reply_count": 5
  },
  {
    "id": 36,
    "from_id": 249011483,
    "to_id": -101815039,
    "date": 1442500757,
    "post_type": "post",
    "text": "Домашку выложить не забудьте ",
    "can_delete": 1,
    "post_source": {
      "type": "api",
      "platform": "iphone"
    },
    "comments": {
      "count": 0,
      "can_post": 1
    },
    "likes": {
      "count": 1,
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    "reposts": {
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    },
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    "reply_count": 0
  },
  {
    "id": 28,
    "from_id": 211551056,
    "to_id": -101815039,
    "date": 1442306249,
    "post_type": "post",
    "text": "",
    "can_delete": 1,
    "media": {
      "type": "photo",
      "owner_id": -101815039,
      "item_id": 381477357,
      "thumb_src": "http://cs624425.vk.me/v624425056/49e35/_w_YDirrrQU.jpg"
    },
    "attachment": {
      "type": "photo",
      "photo": {
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        "aid": -8,
        "owner_id": -101815039,
        "user_id": 211551056,
        "src": "http://cs624425.vk.me/v624425056/49e35/_w_YDirrrQU.jpg",
        "src_big": "http://cs624425.vk.me/v624425056/49e36/439edT8aXks.jpg",
        "src_small": "http://cs624425.vk.me/v624425056/49e34/uLxZj9yF1F4.jpg",
        "src_xbig": "http://cs624425.vk.me/v624425056/49e37/nhvaG43cV-Y.jpg",
        "src_xxbig": "http://cs624425.vk.me/v624425056/49e38/Ox54xM039hg.jpg",
        "width": 960,
        "height": 720,
        "text": "",
        "created": 1442306250,
        "lat": 55.785025,
        "long": 37.706605,
        "post_id": 28,
        "access_key": "454823aa95a2ee9fbc"
      }
    },
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        "photo": {
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          "aid": -8,
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          "user_id": 211551056,
          "src": "http://cs624425.vk.me/v624425056/49e35/_w_YDirrrQU.jpg",
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          "src_small": "http://cs624425.vk.me/v624425056/49e34/uLxZj9yF1F4.jpg",
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          "height": 720,
          "text": "",
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          "long": 37.706605,
          "post_id": 28,
          "access_key": "454823aa95a2ee9fbc"
        }
      }
    ],
    "post_source": {
      "type": "api",
      "platform": "iphone"
    },
    "comments": {
      "count": 0,
      "can_post": 1
    },
    "likes": {
      "count": 1,
      "user_likes": 0,
      "can_like": 1,
      "can_publish": 0
    },
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    "to_id": -101815039,
    "date": 1442306164,
    "post_type": "post",
    "text": "",
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      "owner_id": -101815039,
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      "thumb_src": "http://cs624425.vk.me/v624425056/49e2c/kttj5pUpjTk.jpg"
    },
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      "type": "photo",
      "photo": {
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        "aid": -8,
        "owner_id": -101815039,
        "user_id": 211551056,
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        "src_small": "http://cs624425.vk.me/v624425056/49e2b/GpS0xwCa66c.jpg",
        "src_xbig": "http://cs624425.vk.me/v624425056/49e2e/pe4tflJokqs.jpg",
        "src_xxbig": "http://cs624425.vk.me/v624425056/49e2f/7vkU8nUyNxc.jpg",
        "width": 960,
        "height": 720,
        "text": "",
        "created": 1442306166,
        "lat": 55.785083,
        "long": 37.711116,
        "post_id": 27,
        "access_key": "cb01ac011f4abbc0af"
      }
    },
    "attachments": [
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        "type": "photo",
        "photo": {
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          "aid": -8,
          "owner_id": -101815039,
          "user_id": 211551056,
          "src": "http://cs624425.vk.me/v624425056/49e2c/kttj5pUpjTk.jpg",
          "src_big": "http://cs624425.vk.me/v624425056/49e2d/ihg9szTvLew.jpg",
          "src_small": "http://cs624425.vk.me/v624425056/49e2b/GpS0xwCa66c.jpg",
          "src_xbig": "http://cs624425.vk.me/v624425056/49e2e/pe4tflJokqs.jpg",
          "src_xxbig": "http://cs624425.vk.me/v624425056/49e2f/7vkU8nUyNxc.jpg",
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          "text": "",
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    ],
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      "platform": "iphone"
    },
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    "reposts": {
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  },
  {
    "id": 16,
    "from_id": 249011483,
    "to_id": -101815039,
    "date": 1442069345,
    "post_type": "post",
    "text": "Кто нибудь сделал алгебру ?",
    "can_delete": 1,
    "post_source": {
      "type": "api",
      "platform": "iphone"
    },
    "comments": {
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  },
  {
    "id": 9,
    "from_id": 127082413,
    "to_id": -101815039,
    "date": 1441911418,
    "post_type": "post",
    "text": "Официальная информациия ,староста нашей группы Александр Кондор!",
    "can_delete": 1,
    "post_source": {
      "type": "api",
      "platform": "android"
    },
    "comments": {
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  {
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    "from_id": -101815039,
    "to_id": -101815039,
    "date": 1441656588,
    "post_type": "post",
    "text": "",
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    "media": {
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      "owner_id": -101815039,
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      "thumb_src": "http://cs629111.vk.me/v629111548/e99f/DcV1yHZK1fw.jpg"
    },
    "attachment": {
      "type": "photo",
      "photo": {
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        "owner_id": -101815039,
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        "src": "http://cs629111.vk.me/v629111548/e99f/DcV1yHZK1fw.jpg",
        "src_big": "http://cs629111.vk.me/v629111548/e9a0/Qf8q8PpH7Jg.jpg",
        "src_small": "http://cs629111.vk.me/v629111548/e99e/2Jq8e-0SptQ.jpg",
        "src_xbig": "http://cs629111.vk.me/v629111548/e9a1/Uha0MvOoVCU.jpg",
        "src_xxbig": "http://cs629111.vk.me/v629111548/e9a2/v8hqUldA6Kk.jpg",
        "width": 730,
        "height": 1024,
        "text": "",
        "created": 1441656588,
        "post_id": 1
      }
    },
    "attachments": [
      {
        "type": "photo",
        "photo": {
          "pid": 380592775,
          "aid": -6,
          "owner_id": -101815039,
          "user_id": 100,
          "src": "http://cs629111.vk.me/v629111548/e99f/DcV1yHZK1fw.jpg",
          "src_big": "http://cs629111.vk.me/v629111548/e9a0/Qf8q8PpH7Jg.jpg",
          "src_small": "http://cs629111.vk.me/v629111548/e99e/2Jq8e-0SptQ.jpg",
          "src_xbig": "http://cs629111.vk.me/v629111548/e9a1/Uha0MvOoVCU.jpg",
          "src_xxbig": "http://cs629111.vk.me/v629111548/e9a2/v8hqUldA6Kk.jpg",
          "width": 730,
          "height": 1024,
          "text": "",
          "created": 1441656588,
          "post_id": 1
        }
      }
    ],
    "post_source": {
      "type": "api",
      "platform": "android",
      "data": "profile_photo"
    },
    "comments": {
      "count": 0,
      "can_post": 1
    },
    "likes": {
      "count": 0,
      "user_likes": 0,
      "can_like": 1,
      "can_publish": 0
    },
    "reposts": {
      "count": 0,
      "user_reposted": 0
    },
    "online": 1,
    "reply_count": 0
   }
  ]
  }
  </code></pre>
  
  <p>UPD: Solved by using </p>
  
  <pre><code>NSData* data = [stringRes dataUsingEncoding:NSUTF8StringEncoding];
  </code></pre>