Javascript, Ajax & JSON: weird "xml processing" error when parsing response

Question

I make an ajax call with jquery $.get() which returns a json array and it works fine on some cases. On other cases however, in Firefox i get a weird error saying (translated from german):

XML-processing error: syntax error

This is the structure of the json as shown in my servlet int the java console:

[{"key":"...","type":"...","content":"..."},
 {"key":"...","type":"...","content":"..."},
 ...]

And this is the structure when logged in ff console using JSON.stringify():

[{\"key":\"...",\"type":\"...",\"content":\"..."},
     {\"key":\"...",\"type":\"...",\"content":\"..."},
     ...]

My request simply looks like this:

$.get(url, 
        {"operation": "search", "searchText": searchText, "types": types, "resultNumber": 99},
        function(data, status){
            console.log(JSON.stringify(data));
    });

My java method for creating the JSON array:

private JSONArray parseJSON (ArrayList<ResultObject> aResultList) throws JSONException
    {
        JSONArray resultJSONArray = new JSONArray();

        for (ResultObject resultObject : aResultList)
        {
            JSONObject jsonObject = new JSONObject();
            HashMap<String,String> fields = resultObject.getFields();

            for (Map.Entry<String, String> entry : fields.entrySet())
            {
                jsonObject.put(entry.getKey(), entry.getValue());
            }
            resultJSONArray.put(jsonObject);
        }
        return resultJSONArray;
    }

Whats going on here? Where are all these backslashes in the returned json coming from?

Have you tried UTF-8 encoding on both your code page and the response source? — pokeybit
– pokeybit, Commented Jul 27, 2017 at 11:17

Darkves · Accepted Answer · 2017-07-27 11:51:05Z

1

Looks like that you'r response is not processed by jQuery as you expected. try to add a

dataType:"json"

as option for you'r request, also take care that you'r server-side set's the right header on HTTP response (Content-Type: application/json)

because as I can see from you'r post, looks like that you pass a string to JSON.stringify

I hope that i help you, have a nice day

answered Jul 27, 2017 at 11:51

Darkves

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1 Comment

Sarah Trees Over a year ago

just had the same problem ... had to try the solution. "dataType" is not needed in the version of the pure enumeration. Just add $.get a new parameter "json". <pre> <code> $.get(url, {"operation": "search", "searchText": searchText, "types": types, "resultNumber": 99}, function(data, status){ console.log(JSON.stringify(data)); }, "json" ); </code></pre>

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