'JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Unterminated object at line 1 column 30'

Question

I have an API response as below:

[
{
    "id": "123",
    "date": "2016-12-11T12:23:34Z",
    "description": "A bag of spanners",
    "amount": "35.25",
    "currency": "GBP"
},
{
    "id": "124",
    "date": "2016-12-12T01:58:59Z",
    "description": "Hot chocholate",
    "amount": "12.50",
    "currency": "GBP"
},
{
    "id": "125",
    "date": "2016-12-12T06:11:06Z",
    "description": "Subscriptions - Magazine",
    "amount": "5.99",
    "currency": "GBP"
},
{
    "id": "126",
    "date": "2016-12-13T10:03:17Z",
    "description": "Movie rental",
    "amount": "3.99",
    "currency": "GBP"
}]

I tried parsing it using java as follows:

            Object object = (Object) HttpRequest.getInputStreamFromUrl(ApiUtils.getTransactionsUrl(), Object.class, mContext);
            Type typeMyType = new TypeToken<ArrayList<Transaction>>(){}.getType();
            Gson gson = new Gson();
            transactionList = gson.fromJson(object.toString(), typeMyType);

I'm getting 'JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Unterminated object at line 1 column 30'

I also tried some other approaches which caused com.google.gson.internal.LinkedTreeMap cannot be cast to org.json.JSONObject

How to parse this type of JSON object?

There is nothing wrong with the JSON you posted. What does `HttpRequest.getInputStreamFromUrl` return? If you got it from [this question](https://stackoverflow.com/questions/6932369/inputstream-from-a-url), it returns an `InputStream` and not a `String`, which is why your code is complaining. — Sean Bright, Oct 15 '19 at 18:25
Agreed with @Unimportant's comment! If the returned object is an `InputStream`, you can refer to [5 ways to convert Inputstream to String in Java](http://roufid.com/5-ways-convert-inputstream-string-java/) for further parsing. — LHCHIN, Oct 16 '19 at 00:40
getInputStreamFromUrl returns an Object. As @LHCHIN suggested I converted InputStream to String rather than Object. And then converting the string to a list of my class objects- worked. Thank you! — Neeraja Gandla, Oct 16 '19 at 02:36

score 0 · Accepted Answer · answered Oct 16 '19 at 02:44

I was able to solve this issue by converting the InputStream to String rather than Object. I used a method to convert InputStream to Object directly. But it doesn't seem to work at times. I used the following method to convert InputStream to String:

    public static String convertStreamToString(HttpResponse response) {
    String responseBody = null;
    HttpEntity entity = response.getEntity();
    if (entity != null) {
        try {
            responseBody = EntityUtils.toString(entity);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return responseBody;
}

And then converted the returned String to List as follows:

            String responseStr = (String) HttpRequest.getInputStreamFromUrl(ApiUtils.getTransactionsUrl(), mContext);
            Type typeMyType = new TypeToken<ArrayList<Transaction>>(){}.getType();
            Gson gson = new Gson();
            transactionList = gson.fromJson(responseStr.toString(), typeMyType);

Hope it helps someone who faces the same issue.

'JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Unterminated object at line 1 column 30'

1 Answers1