How to create JSON Object using String?

Question

I want to create a JSON Object using String.

Example : JSON {"test1":"value1","test2":{"id":0,"name":"testName"}}

In order to create the above JSON I am using this.

String message;
JSONObject json = new JSONObject();

json.put("test1", "value1");

JSONObject jsonObj = new JSONObject();

jsonObj.put("id", 0);
jsonObj.put("name", "testName");
json.put("test2", jsonObj);

message = json.toString();
System.out.println(message);

I want to know how can I create a JSON which has JSON Array in it.

Below is the sample JSON.

{
  "name": "student",
   "stu": {
    "id": 0,
    "batch": "batch@"
  },
  "course": [
    {
      "information": "test",
      "id": "3",
      "name": "course1"
    }
  ],
  "studentAddress": [
    {
      "additionalinfo": "test info",
      "Address": [
        {
          "H.No": "1243",
          "Name": "Temp Address",
          "locality": "Temp locality",
           "id":33          
        },
        {
           "H.No": "1243",
          "Name": "Temp Address",
          "locality": "Temp locality", 
           "id":33                   
        },        
        {
           "H.No": "1243",
          "Name": "Temp Address",
          "locality": "Temp locality", 
           "id":36                   
        }
      ],
"verified": true,
    }
  ]
}

Thanks.

Sridhar Sarnobat · Accepted Answer · 2022-08-17 03:10:48Z

265

org.json.JSONArray may be what you want.

String message;
JSONObject json = new JSONObject();
json.put("name", "student");

JSONArray array = new JSONArray();
JSONObject item = new JSONObject();
item.put("information", "test");
item.put("id", 3);
item.put("name", "course1");
array.put(item);

json.put("course", array);

message = json.toString();

// message
// {"course":[{"id":3,"information":"test","name":"course1"}],"name":"student"}

edited Aug 17, 2022 at 3:10

Sridhar Sarnobat

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answered Nov 21, 2013 at 9:37

srain

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4 Comments

morha13 Over a year ago

How do I convert it back to a JSONObject from a string?

Camille Over a year ago

JSONObject jsonObj = new JSONObject("your_json_string");

user2490003 Over a year ago

FYI that this will fail to parse JSON arrays (even though they are technically valid JSON). For example, trying JSONObject("[{\"foo\":2, \"bar\": 3}]"); results in A JSONObject text must begin with '{' at 1 [character 2 line 1]

sareem Over a year ago

JSONArray uses the "add" rather than the "put" method. Change array.put(item); to array.add(item);

BDL · Accepted Answer · 2018-08-22 07:55:49Z

13

In contrast to what the accepted answer proposes, the documentation says that for JSONArray() you must use put(value) no add(value).

https://developer.android.com/reference/org/json/JSONArray.html#put(java.lang.Object)

(Android API 19-27. Kotlin 1.2.50)

edited Aug 22, 2018 at 7:55

BDL

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answered Aug 22, 2018 at 6:51

Walter Palacios

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Comments

Lei00 · Accepted Answer · 2020-08-24 09:48:00Z

4

If you use the gson.JsonObject you can have something like that:

import com.google.gson.JsonObject;
import com.google.gson.JsonParser;

String jsonString = "{'test1':'value1','test2':{'id':0,'name':'testName'}}"
JsonObject jsonObject = (JsonObject) jsonParser.parse(jsonString)

answered Aug 24, 2020 at 9:48

Lei00

411 bronze badge

1 Comment

Akbar Inam Over a year ago

updated code that worked for me import com.google.gson.JsonObject; import com.google.gson.JsonParser; public class Main { public static void main(String[] args) { String jsonString = "{'test1':'value1','test2':{'id':0,'name':'testName'}}"; JsonParser jsonParser = new JsonParser(); JsonObject jsonObject = (JsonObject) jsonParser.parse(jsonString); // Print the parsed JsonObject System.out.println(jsonObject); } }

Carlos Noé · Accepted Answer · 2022-03-10 17:20:33Z

3

 String jsonString = "{'element1':'value1','element2':{'id':0,'name':'testName'}}";
        JsonObject jsonObject = (JsonObject) JsonParser.parseString(jsonString);

answered Mar 10, 2022 at 17:20

Carlos Noé

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Comments

Valentyn Kolesnikov · Accepted Answer · 2022-08-11 11:20:42Z

1

Underscore-java can create json from an object.

import com.github.underscore.U;

    String message = U.objectBuilder()
            .add("course", U.arrayBuilder()
                    .add(U.objectBuilder()
                            .add("id", 3)
                            .add("information", "test")
                            .add("name", "course1")
                    ))
            .add("name", "student")
            .toJson();
    System.out.println(message);

// {
//   "course": [
//     {
//       "id": 3,
//       "information": "test",
//       "name": "course1"
//     }
//   ],
//   "name": "student"
// }

edited Aug 11, 2022 at 11:20

answered Mar 5, 2021 at 11:21

Valentyn Kolesnikov

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Comments

Akbar Inam · Accepted Answer · 2023-06-16 14:36:59Z

0

Code that worked for me

import com.google.gson.JsonObject;
import com.google.gson.JsonParser;

public class Main {
    public static void main(String[] args) {
        String jsonString = "{'test1':'value1','test2':{'id':0,'name':'testName'}}";
        JsonParser jsonParser = new JsonParser();
        JsonObject jsonObject = (JsonObject) jsonParser.parse(jsonString);

        // Print the parsed JsonObject
        System.out.println(jsonObject);
    }
}

answered Jun 16, 2023 at 14:36

Akbar Inam

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