带有Ajax响应字符串的JSON解析错误

Question

I have been working on this issue and i have searched for the solution in the web and stackoverflow, but I cant get whats the error exactly.

this is the json string coming from the server through the ajax call.

{root:{name: "root",description: "root description",checked: false,1:{name: "item1",description: "item1 description",checked: true,1.1:{name: "item1.1",description: "item1.1 description",checked: true}}, 2:{name: "item2",description: "item2 description",checked: true}}}

using the below code i am getting the string after xmlhttp.readyState == 4 && xmlhttp.status == 200

var aData;
        try{
        aData =JSON.parse(xmlhttp.responseText);
        }
        catch(err){
        alert(err);
        }

it shows the error like

Json.parse expected property name or '}'

but if use eval() function it works fine

var aData;
        try{
        aData =eval('(' + xmlhttp.responseText + ')');
        }
        catch(err){
        alert(err);
        }

please exaplin what is the error here.

Thanks.

EDIT:

I have checked the string in json viewer and its worked fine. http://jsonviewer.stack.hu/">

Answer 1

That's because that's invalid JSON, you cannot use numbers as key names. So, you can either skip the numbers or put them in quotes so that they are "strings".

Validator output and fixed JSON are below:

Fixed JSON:

{
   "root":{
      "name":"root",
      "description":"root description",
      "checked":false,
      "1":{
         "name":"item1",
         "description":"item1 description",
         "checked":true,
         "1.1":{
            "name":"item1.1",
            "description":"item1.1 description",
            "checked":true
         }
      },
      "2":{
         "name":"item2",
         "description":"item2 description",
         "checked":true
      }
   }
}

Validator output:

Error:Strings should be wrapped in double quotes.[Code 17, Structure 2]
Error:Strings should be wrapped in double quotes.[Code 17, Structure 5]
Error:Strings should be wrapped in double quotes.[Code 17, Structure 9]
Error:Strings should be wrapped in double quotes.[Code 17, Structure 13]
Error:Expecting string, not number.[Code 8, Structure 17]
Error:Expecting comma or }, not colon.[Code 13, Structure 18]
Error:Strings should be wrapped in double quotes.[Code 17, Structure 20]
Error:Strings should be wrapped in double quotes.[Code 17, Structure 24]
Error:Strings should be wrapped in double quotes.[Code 17, Structure 28]
Error:Expecting string, not number.[Code 8, Structure 32]
Error:Expecting comma or }, not colon.[Code 13, Structure 33]
Error:Strings should be wrapped in double quotes.[Code 17, Structure 35]
Error:Strings should be wrapped in double quotes.[Code 17, Structure 39]
Error:Strings should be wrapped in double quotes.[Code 17, Structure 43]
Error:Expecting string, not number.[Code 8, Structure 49]
Error:Expecting comma or }, not colon.[Code 13, Structure 50]
Error:Strings should be wrapped in double quotes.[Code 17, Structure 52]
Error:Strings should be wrapped in double quotes.[Code 17, Structure 56]
Error:Strings should be wrapped in double quotes.[Code 17, Structure 60]