Trouble parsing JSON to string in Java

Question

I have the following JSON:

{
    data: [
    {
        objectType: "ServiceForbiddenException",
        item: {
            service: "users",
            action: "index",
            code: 403,
            message: "Access to the service [users] is forbidden."
        }
    }
    ]
}

I tried parsing it using the following snippet:

       String bodyData = iRes.body().string();
       try{
            JSONObject body = new JSONObject(bodyData);
            JSONArray data = body.getJSONArray("data");
            JSONObject type =  data.getJSONObject(0);
            JSONArray item = data.getJSONArray(1);

        }
        catch (Exception e)
        {
            e.printStackTrace();
        }

the problem is that is that JSONArray data = body.getJSONArray("data");is actually the whole data, and not an array.

How do I parse it correctly? are there better libs / ways to parse a json in Java (Android)

This isn't valid JSON. You could look in to gson for a JSON parser. — tachyonflux
– tachyonflux, Commented Jul 8, 2015 at 22:46
@karaokyo thanks for assisting. I tested it in Link and came out valid — Gil404
– Gil404, Commented Jul 8, 2015 at 22:48
@GabeSechan, where is the error? how should I parse it? thank you — Gil404
– Gil404, Commented Jul 8, 2015 at 22:49
To make it proper JSON you would need to surround keys with ". — Pshemo
– Pshemo, Commented Jul 8, 2015 at 22:53

Pshemo · Accepted Answer · 2015-07-08 23:01:04Z

1

Objects are created using {}, arrays are created using []. So

data:[
 { }
]

is array labelled as data which contains only one object (unlabelled, but indexed as 0), so calling

data.getJSONArray(1);

doesn't make sense here, because it would try to find

data:[
 { }
 [ ] <-this, but you don't have it in your JSON
]

What you seem to want is getting item object which is part of object you already got from array and stored in type.

So instead of

JSONArray item = data.getJSONArray(1);

use

JSONObject item = type.getJSONObject("item");
^^^^^^^^^^        ^^^^    ^^^^^^^^^^ - things you need to change

edited Jul 8, 2015 at 23:01

answered Jul 8, 2015 at 22:58

Pshemo

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Pshemo Over a year ago

Actually there is not many things to read. I think json.org covers all important details about JSON structure.

Gabe Sechan · Accepted Answer · 2015-07-08 22:57:19Z

1

Data is an array of objects (with only 1 object in the example). So your type should be type = data.getJSONObject(0).getString("objectType"); and item = type = data.getJSONObject(0).getJSONObject("item"); Notice item is a JSONObject, not a JSONArray.

If you need to process all the items in data, loop over them and change the index you're getting from 0.

Actually looking at your code- you seem to be a little confused on Objects and Arrays in general. You might want to read up on them, with respect to JSON.

edited Jul 8, 2015 at 22:57

answered Jul 8, 2015 at 22:49

Gabe Sechan

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1 Comment

Gil404 Over a year ago

You are quite right here :) now, I am confused. Can you point out what I am missing? or recommend any good article? Thank you :)

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