org.json.JSONException: JSONArray[0] is not a JSONObject - Java

Question

Hello I am trying to read and parse a JSON file, when I attempt to read it I got exception of =org.json.JSONException: JSONArray[0] is not a JSONObject. The JSON is shorten for sake of example. Provided will be my code,json and desired output.
Code:
public void Trial () throws JSONException {
        String json = "[[{"appId": "MBSP","askPrice": 0,"bidPrice": 0,"collectionDataSource": "ExternalTick","collectionName": "FRM_MBS_TBA_FN_15Y_0.03_FWD0","collectionObservationTime": "2020-09-21T17:47:59.703Z","collectionType": "LIVE","coupon": 1.03,"createdBy": "Test","createdOn": "2020-09-21T17:47:59.703Z","createdOnDate": 0,"forward": 0,"issuingAgency": "FF","lastUpdated": "2020-09-21T17:47:59.703Z","lastUpdatedBy": "string","lastUpdatedDate": 0,"maturity": ,"midPrice":0 ,"mtaVersionNumber": 0,"settlementDate": "2020-09-21T17:47:59.703Z"}]]
 ";
        JSONArray jsonObj = new JSONArray(json);
        for (int i = 0; i < jsonObj.length(); i++) {
            JSONObject jsonobject = jsonObj.getJSONObject(i);
            String Coupon = jsonobject.getString("Coupon");
            System.out.println(Coupon);
        }
    }

JSON:
[[
  {
    "appId": "MBSP",
    "askPrice": 0,
    "bidPrice": 0,
    "collectionDataSource": "ExternalTick",
    "collectionName": "FRM_MBS_TBA_FN_15Y_0.03_FWD0",
    "collectionObservationTime": "2020-09-21T17:47:59.703Z",
    "collectionType": "LIVE",
    "coupon": 1.03,
    "createdBy": "Test",
    "createdOn": "2020-09-21T17:47:59.703Z",
    "createdOnDate": 0,
    "forward": 0,
    "issuingAgency": "FF",
    "lastUpdated": "2020-09-21T17:47:59.703Z",
    "lastUpdatedBy": "string",
    "lastUpdatedDate": 0,
    "maturity": ,
    "midPrice":0 ,
    "mtaVersionNumber": 0,
    "settlementDate": "2020-09-21T17:47:59.703Z"
  }
]]

Wanted ooutput
 1.03

Any help would be appreciated.

Anish B. · Accepted Answer

The valid JSON should be :
[
  {
    "appId": "MBSP",
    "askPrice": 0,
    "bidPrice": 0,
    "collectionDataSource": "ExternalTick",
    "collectionName": "FRM_MBS_TBA_FN_15Y_0.03_FWD0",
    "collectionObservationTime": "2020-09-21T17:47:59.703Z",
    "collectionType": "LIVE",
    "coupon": 1.03,
    "createdBy": "Test",
    "createdOn": "2020-09-21T17:47:59.703Z",
    "createdOnDate": 0,
    "forward": 0,
    "issuingAgency": "FF",
    "lastUpdated": "2020-09-21T17:47:59.703Z",
    "lastUpdatedBy": "string",
    "lastUpdatedDate": 0,
    "maturity": 0,
    "midPrice":0 ,
    "mtaVersionNumber": 0,
    "settlementDate": "2020-09-21T17:47:59.703Z"
  }
]

Update the code as well :
public class Sample {

public static void main(String[] args) {
        String json = "[{n" + 
                "   "appId": "MBSP",n" + 
                "   "askPrice": 0,n" + 
                "   "bidPrice": 0,n" + 
                "   "collectionDataSource": "ExternalTick",n" + 
                "   "collectionName": "FRM_MBS_TBA_FN_15Y_0.03_FWD0",n" + 
                "   "collectionObservationTime": "2020-09-21T17:47:59.703Z",n" + 
                "   "collectionType": "LIVE",n" + 
                "   "coupon": 1.03,n" + 
                "   "createdBy": "Test",n" + 
                "   "createdOn": "2020-09-21T17:47:59.703Z",n" + 
                "   "createdOnDate": 0,n" + 
                "   "forward": 0,n" + 
                "   "issuingAgency": "FF",n" + 
                "   "lastUpdated": "2020-09-21T17:47:59.703Z",n" + 
                "   "lastUpdatedBy": "string",n" + 
                "   "lastUpdatedDate": 0,n" + 
                "   "maturity": 0,n" + 
                "   "midPrice": 0,n" + 
                "   "mtaVersionNumber": 0,n" + 
                "   "settlementDate": "2020-09-21T17:47:59.703Z"n" + 
                "}]";
        JSONArray jsonObj = new JSONArray(json);
        for (int i = 0; i < jsonObj.length(); i++) {
            JSONObject jsonobject = jsonObj.getJSONObject(i);
            double Coupon = jsonobject.getDouble("coupon");
            System.out.println(Coupon);
        }
    }

}

Output :
1.03

Toàn Nguyễn Hải · Answer

Your JSON input seems invalid:

No [[...]]
"maturity": , maybe not valid json node
code String Coupon = jsonobject.getString("Coupon"); not correct

Solution:

Update JSON input like. [...]
Update maturity to a valid even value is empty/null
Change you code to String coupon = jsonobject.getString("coupon");

Nícolas Sims Botelho · Answer

if you check again your json you will notice there is array in array and then object.
[ [ { } ] ]
Try this input, [ { } ]
 [ { "appId": "MBSP", "askPrice": 0, "bidPrice": 0, "collectionDataSource": "ExternalTick", "collectionName": "FRM_MBS_TBA_FN_15Y_0.03_FWD0", "collectionObservationTime": "2020-09-21T17:47:59.703Z", "collectionType": "LIVE", "coupon": 1.03, "createdBy": "Test", "createdOn": "2020-09-21T17:47:59.703Z", "createdOnDate": 0, "forward": 0, "issuingAgency": "FF", "lastUpdated": "2020-09-21T17:47:59.703Z", "lastUpdatedBy": "string", "lastUpdatedDate": 0, "maturity": , "midPrice":0 , "mtaVersionNumber": 0, "settlementDate": "2020-09-21T17:47:59.703Z" } ]
Another way is handle in code to access json array inside a
json array to get json object.
Thanks, I hope that helps you.

org.json.JSONException: JSONArray[0] is not a JSONObject - Java

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