JSON parse array

Question

I have been struggling with this for hours, what am I doing wrong.

I am trying to parse data from this API using org.json library.

    JSONParser jsonParser = new JSONParser();
    JSONObject obj = (JSONObject) jsonParser.parse(getAllCustomers());


    JSONArray arr = obj.getJSONArray("data");
    for (int i = 0; i < arr.length(); i++) {
        String name = arr.getJSONObject(i).getString("name");     
    }

I dont even know if my code is correct, but I get an error saying that .getJSONArray() cannot find symbol, same with .getJSONObject.

What am I doing wrong here.

JSON:

"data": [
    {
        "id": 1, 
        "name": "Bitcoin", 
        "symbol": "BTC", 
        "website_slug": "bitcoin"
    }, 
    {
        "id": 2, 
        "name": "Litecoin", 
        "symbol": "LTC", 
        "website_slug": "litecoin"
    }, 
    {
        "id": 3, 
        "name": "Namecoin", 
        "symbol": "NMC", 
        "website_slug": "namecoin"
    }, 
    {
        "id": 4, 
        "name": "Terracoin", 
        "symbol": "TRC", 
        "website_slug": "terracoin"
    }, 
    {
        "id": 5, 
        "name": "Peercoin", 
        "symbol": "PPC", 
        "website_slug": "peercoin"
    }, 
    {
        "id": 6, 
        "name": "Novacoin", 
        "symbol": "NVC", 
        "website_slug": "novacoin"
    }, 
    {
        "id": 8, 
        "name": "Feathercoin", 
        "symbol": "FTC", 
        "website_slug": "feathercoin"
    }, 
    {
        "id": 9, 
        "name": "Mincoin", 
        "symbol": "MNC", 
        "website_slug": "mincoin"
    },

}

EDIT changed from "posts" to "data". Still issues with the above methods

You give us the wrong API. In your API we do not see posts — Mạnh Quyết Nguyễn
– Mạnh Quyết Nguyễn, Commented Jun 12, 2018 at 11:53

Amit Kumar · Accepted Answer · 2018-06-12 11:57:28Z

1

Here you need to do,

JSONArray arr = obj.getJSONArray("data");

instead of

JSONArray arr = obj.getJSONArray("posts");

Since, JsonObject have value key named 'data' not 'posts'

answered Jun 12, 2018 at 11:57

Amit Kumar

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VAluvila · Accepted Answer · 2018-06-12 15:04:04Z

1

Check 1: If you are trying to parse the given API, then there is no array with name "posts" at all!! Try with "data" instead :-)

JSONArray arr = obj.getJSONArray("data");

Check 2: You say, you still have the error even after using "data". In that case look at what getAllCustomers() returns. Does it return a valid json string??

Check 3: In case the getAllCustomers() returns a valid JSON, does it contain a "data" element? If yes, is that an Array?

edited Jun 12, 2018 at 15:04

answered Jun 12, 2018 at 12:13

VAluvila

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