Error converting a String to a JSONObject

Question

I'm having some issues with my android application. I currently have a String with my JSON in it.

 HttpResponse response = null;
        HttpClient httpClient = new DefaultHttpClient();

        HttpPost httpPost = new HttpPost("http://www.brocksportfolio.com/GetPendingRequests.php");

        List<NameValuePair> nameValuePair = new ArrayList<NameValuePair>();
        nameValuePair.add(new BasicNameValuePair("Username", "Brock"));

        try {
            httpPost.setEntity(new UrlEncodedFormEntity(nameValuePair));
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        try {
            response = httpClient.execute(httpPost);

            // writing response to log
            Log.d("Http Response:", response.toString());
        } catch (IOException e) {
            e.printStackTrace();
        }

        String jsonStr = response.toString();

I am trying to initialize a JSONObject with that string in it like so.

JSONObject jsonObj = new JSONObject(jsonString);

I am getting this error.

org.json.JSONException: Value org.apache.http.message.BasicHttpResponse@3526f881 of type java.lang.String cannot be converted to JSONObject

I believe the reason for this error is because I am converting an HTTPPostResponse to a string and then trying to pass that string through to a JSONObject but i'm just really not sure how to fix it. Thanks for the help!

possible duplicate of How to print out returned message from HttpResponse? — Paul Woitaschek
– Paul Woitaschek, Commented Mar 18, 2015 at 17:14
@Fahim thanks for the support but looks like the answer below worked! I added a comment of a problem that occured after fixing this problem that I ran into earlier and couldn't fix so help on that would be much appreciated as well! — PurpSchurp
– PurpSchurp, Commented Mar 18, 2015 at 17:20

Sam Dozor · Accepted Answer · 2015-03-18 17:14:06Z

2

Give this a shot:

try {
    response = httpClient.execute(httpPost);
    String responseBody = EntityUtils.toString(response.getEntity());
} catch (IOException e) {
    e.printStackTrace();
}

JSONObject jsonObj = new JSONObject(responseBody);

answered Mar 18, 2015 at 17:14

Sam Dozor

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6 Comments

PurpSchurp Over a year ago

This worked for converting! I have one more problem that just occured. I'm now getting this issue. org.json.JSONException: Value [{"fromUser":"Andrew"},{"fromUser":"Jimmy"},{"fromUser":"Mac"}] of type org.json.JSONArray cannot be converted to JSONObject And the line of code is this pendingRequests = jsonObj.getJSONArray(TAG_FROMUSER); Any ideas?

P-a Bäckström Over a year ago

The string is an JSONArray, but you are trying to convert it to a JSONObject.

PurpSchurp Over a year ago

@P-aBäckström what shall I do to fix that.

P-a Bäckström Over a year ago

JSONArray jsonArray = new JSONArray(responseBody);

P-a Bäckström Over a year ago

A JSONArray is an array, so in order to get your object you can do like this: JSONObject jsonObj = jsonArray.getJSONObject(0);

|

P-a Bäckström · Accepted Answer · 2015-03-18 17:20:52Z

The actual message is contained by the HttpEntity which the BasicHttpReponse holds. You can retrieve an InputStream from the HttpEntity, make a String out of its contents and then make a JSONObject out of it. Of course you will need to check the response code (i.e. is it a 200?) first. All of this is quite cumbersome and error-prone.

I would recommend you to check out Volley instead, a simple JsonObjectRequest can be as easy as this (from the linked developer docs):

String url = "http://my-json-feed";

JsonObjectRequest jsObjRequest = new JsonObjectRequest
    (Request.Method.GET, url, null, new Response.Listener<JSONObject>()     {

    @Override
    public void onResponse(JSONObject response) {
        mTxtDisplay.setText("Response: " + response.toString());
    }
}, new Response.ErrorListener() {

    @Override
    public void onErrorResponse(VolleyError error) {
    // TODO Auto-generated method stub

    }
});

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