title: SyntaxError: JSON.parse: unexpected character
body: <p>I'm having a problem. I have a json code as below. 
  I want to parse them but get an error:
  SyntaxError: JSON.parse: unexpected character
  I don't know where is the error. Would anyone help?</p>
  
  <p>My js code:</p>
  
  <pre><code>  function retreive() {
    var userInfo = new Array();
    userInfo[0] = $("#contactId").val();
    userInfo[1] = $("#pw").val();
    var cId = $.ajax({ 
      url: "server.php", 
      type: "POST", 
  data: {phpData : userInfo}, 
      datatype: "json",
  success:function(msg) {
      responseJson = JSON.parse(msg.responseText);
  var outputHtml = "";
      for (var i=0; i&lt;responseJSON.user.mary.length; i++) {
  outputHtml += responseJSON.user.mary[i].sender[i].sendDate + 
  ", " + responseJSON.user.mary[i].sender[i].time + 
  ", " + responseJSON.user.mary[i].sender[i].timezone + 
  ", " + responseJSON.user.mary[i].sender[i].message + "&lt;br/&gt;"}
  divMessage = document.getElementById("message");
      divMessage.innerHTML = outputHtml;
  }
  });   
  </code></pre>
  
  <p>}  </p>
  
  <p>my php code:</p>
  
  <pre><code>    $data = '{
    "user" : 
      [
        {
      "mary" :
        [
          {
            "sender1" :
          [
                {
                  "sendDate"     : "2012-01-13",
                  "time"     : "15:00:21",
                  "timezone" : "Asia/Hong_Kong",
                  "message"  : "hi"
            },
            {
                  "sendDate"     : "2012-01-18",
                  "time"     : "16:00:01",
                  "timezone" : "Asia/Hong_Kong",
              "message"  : "how are you"
                },
                {
                  "sendDate"     : "2012-01-21",
                  "time"     : "14:31:42",
                  "timezone" : "Asia/Hong_Kong",
              "message"  : "good"
            }  
          ],
            "sender2" :
          [
            {
                  "sendDate"     : "2012-01-14",
                  "time"     : "09:01:25",
                  "timezone" : "Asia/Hong_Kong",
                  "message"  : "good morning"
            },
                {
                  "sendDate"     : "2012-01-14",
                  "time"     : "09:03:41",
              "timezone" : "Asia/Hong_Kong",
                  "message"  : "where are you"
            },
            {
                  "sendDate"     : "2012-01-14",
                  "time"     : "09:05:42",
                  "timezone" : "Asia/Hong_Kong",
                  "message"  : "me too"
            }
              ],
          }  
        ],    
      "peter" :
        [
          {
            "sender1" :
              [         
                {
                  "sendDate"     : "2012-01-13",
                  "time"     : "10:44:28",
              "timezone" : "Asia/Hong_Kong",
                  "message"  : "hey man"
            },
            {
                  "sendDate"     : "2012-01-13",
                  "time"     : "10:46:11",
                  "timezone" : "Asia/Hong_Kong",
                  "message"  : "what are you doing"
                },
                {
                  "sendDate"     : "2012-01-13",
                  "time"     : "10:48:33",
                  "timezone" : "Asia/Hong_Kong",
                  "message"  : "nice"
            }
          ],
            "sender3" :
              [
                {
                  "sendDate"     : "2012-01-18",
                  "time"     : "14:23:58",
              "timezone" : "Asia/Hong_Kong",
                  "message"  : "Had you send the file to me"
                },
            {
                  "sendDate"     : "2012-01-18",
                  "time"     : "15:01:39",
              "timezone" : "Asia/Hong_Kong",
                  "message"  : "i have not receive yet"
            },
                {
                  "sendDate"     : "2012-01-19",
                  "time"     : "09:08:32",
                  "timezone" : "Asia/Hong_Kong",
                  "message"  : "received"
            },
          ],  
          }
        ],
        }
      ],
  }';
  echo $data;
  </code></pre>