How can I convert String to JSON object in Java

Question

I am working on a String. I want to convert it into JSONobject. How can I do this?

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Answer 1

Hi @Daisy

You can use Google gson 

for more details

The object in examples:

class BagOfPrimitives {
  private int value1 = 1;
  private String value2 = "abc";
  private transient int value3 = 3;
  BagOfPrimitives() {
    // no-args constructor
  }
} 

Serialization

BagOfPrimitives obj = new BagOfPrimitives();
Gson gson = new Gson();
String json = gson.toJson(obj); 
==> json is {"value1":1,"value2":"abc"} 

Note that you can not serialize objects with circular references since that will result in infinite recursion.

(Deserialization)

BagOfPrimitives obj2 = gson.fromJson(json, BagOfPrimitives.class);  
==> obj2 is just like obj

Another example of Gson:

Gson is easy to learn and implement, you need to know is the following two methods:

-> toJson() – convert java object to JSON format

-> fromJson() – convert JSON into java object

import com.google.gson.Gson;

public class TestObjectToJson {
  private int data1 = 100;
  private String data2 = "hello";

  public static void main(String[] args) {
      TestObjectToJson obj = new TestObjectToJson();
      Gson gson = new Gson();

      //convert java object to JSON format
      String json = gson.toJson(obj);

      System.out.println(json);
  }

}
Output

{"data1":100,"data2":"hello"}

Resources.

Google Gson project home

Thanks 

Sureshprabhu

Answer 2

If you have a String and want to convert it into JSONObject, you should use or.json library.

JSONObject jsonObj = new JSONObject("{\"firstname\":\"John\",\"lastname\":\"Lee\"}");

Answer 3

Try GSON, GSON directly converts a string to a java object

Example:

String jsonString = {"Name": "Harry Potter"}
create a new class:
class Name {
@SerializedName("name")
private String name;
public void setname(String name) {
this.name = name;
}
public String getname(){
return name;
}
}

// in java

Gson gson = new Gson();
Name name = gson.fromJson(jsonString, Name.class);
System.out.println("Name is "+name.getname());

Answer 4

JSONParser parser = new JSONParser();
JSONObject json = (JSONObject) parser.parse(stringToParse);

You can use this code.
Hope this helps.

Comments

The type JSONParser is deprecated

The type JSONObject is deprecated

---

What application are you running it on?

---

I did a little research and found that the use of JSONParser is deprecated. The documentation says:

JSONParser is deprecated. The new usage is JSONParser(JSONParser.MODE_*)

Try the new usage and see if it works.

Answer 5

Another simple approach:

Name name = new ObjectMapper().readValue(jsonString, Player.class);

Answer 6

import javax.json.*;

...

String TEXT;
JsonObject body = Json.createReader(new StringReader(TEXT)).readObject()

Answer 7

You can use Gson it is an open source library to deal with JSON. You can convert JSON String to Java object in just 2 lines by using Gson as shown below :
Gson g = new Gson(); Player p = g.fromJson(jsonString, Player.class)

You can also convert a Java object to JSON by using toJson() method as shown below

String str = g.toJson(p);

Answer 8

You can use google-gson:

class Phone {
 public String name;
}


...
String jsonString = "{\"name\":\"WP\"}";
Gson gson = new Gson();
Phone fooFromJson = gson.fromJson(jsonString, Phone.class);
...

Answer 9

JSON-Simple is open source library which supports JSON parsing and formatting.

JSONParser parser = new JSONParser();
JSONObject json = (JSONObject) parser.parse(stringToParse);

Comments

The type JSONParser is deprecated

The type JSONObject is deprecated

---

I am getting different error:

---

you need to add jar in build path. perhaps this is deprecated.

use the new way https://www.edureka.co/community/2351/how-can-i-convert-string-to-json-object-in-java?start=10#a_list_title.

---

Tried that, no luck!

Answer 10

The simplest way to achieve this 

JSONParser parser = new JSONParser(); 
JSONObject json = (JSONObject) parser.parse(stringToParse);

Comments

The type JSONParser is deprecated

The type JSONObject is deprecated

Answer 11

object name = new ObjectMapper().readValue(jsonString, object.class);

Hope this helps

Answer 12

//package details

import org.json.simple.JsonObject;

import org.json.simple.Jsoner;

//logic

JsonObject jsonObject = (JsonObject) Jsoner.deserialize(JSON_STRING_VALUE);

Answer 13

{
"method" : "conferenceCallout",
"conferenceCallout" :
{
"cli" : "amanda",
"destination" : { "type" : "number", "endpoint" : "+919986351005" },
"domain" : "pstn",
"custom" : "customData",
"locale" : "en-US",
"greeting" : "Welcome to my conference",
"conferenceId" : "myConference",
"enableAce": false,
"enableDice" : false
}
}

Answer 14

Gson g = new Gson();
Player p = g.fromJson(jsonString, Player.class)

example of json are

jsonString = {
  "name" : "rajesh",
  "sport" : "cricket",
  "age" : 25,
  "id" : 121,
  "lastScores" : [ 20, 10, 3o, 5, 10, 0, 11, 100 ]
}

 

Answer 15

public class HelloWord{

    public static void main(String []args){

       String s = "{\"swagger\\\":\\\"2.0\\\",\\\"paths\\\":{\\\"/upi/ReqPay\\\":{\\\"post\\\":{\\\"parameters\\\":[{\\\"name\\\":\\\"Payload\\\",\\\"description\\\":\\\"Request Body\\\",\\\"required\\\":false,\\\"in\\\":\\\"body\\\",\\\"schema\\\":{\\\"type\\\":\\\"object\\\",\\\"properties\\\":{\\\"payload\\\":{\\\"type\\\":\\\"string\\\"}}}}],\\\"responses\\\":{\\\"200\\\":{\\\"description\\\":\\\"\\\"}},\\\"produces\\\":[\\\"application/xml\\\"],\\\"consumes\\\":[\\\"application/xml\\\"],\\\"x-auth-type\\\":\\\"Application & Application User\\\",\\\"x-throttling-tier\\\":\\\"Unlimited\\\"}}},\\\"info\\\":{\\\"title\\\":\\\"RequestPay\\\",\\\"version\\\":\\\"1.0.0\\\",\\\"description\\\":\\\"API is used for both Direct Pay and Collect Pay transaction\\\\ninitiation by the PSPs and processing the transaction through\\\\none of the following channels IMPS,AEPS etc. \\\"}}\"";

       System.out.println(s.replace("\\"," "));

    }

}

Answer 16

example of convert String to JSON object in Java?

jsonstring

jsonString = {
  "name" : "Ronaldo",
  "sport" : "soccer",
  "age" : 25,
  "id" : 121,
  "lastScores" : [ 2, 1, 3, 5, 0, 0, 1, 1 ] 

}

string to json object with using gson

The Gson is an open source library to deal with JSON in Java programs.You can convert JSON String to Java object in just 2 lines by using Gson as shown below

Gson g = new Gson(); 

Player p =g.fromJson(jsonString, Player.class)

You can also convert a Java object to JSON by using to Json() method as shown below

String str = g.toJson(p);

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Answer 17

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}

Comments

What about this?

Answer 18

There are lots of tools for this....

Comments

Which tools can be used??

Answer 19

String prams="{"field1":"value","field2":"value2" }";

JSONObject json = new JSONObject(prams); // just this line is enough

make sure the String is alredy in proper json format as shown above

Comments

Thanks, @Edd for your contribution.

Please register at Edureka Community and earn credits for every contribution. A contribution could be asking a question, answering, commenting or even upvoting/downvoting an answer or question.

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Cheers!

Answer 20

you can use google gson.

Answer 21

Here, you can use the content of Google's gson, serialization, and deserialization.

Answer 22

String to JSON Object using Gson

The Gson is an open-source library to deal with JSON in Java programs. It comes from none other than Google, which is also behind Guava, a common purpose library for Java programmers. You can convert JSON String to Java object in just 2 lines by using Gson as shown below :
 

Gson g = new Gson();
Player p = g.fromJson(jsonString, Player.class)

You can also convert a Java object to JSON by using toJson() method as shown below
 

String str = g.toJson(p);

The good thing about Gson is that it's feature-rich and comes from Google, which is known for performance.

 

Answer 23

Another approach could be:

In the following program, we have converted a JSON String to JSON Object.

JsonStringToJsonObjectExample.java

1. import org.json.JSONObject;  

2. import org.json.JSONArray;  

3. public class JsonStringToJsonObjectExample   

4. {  

5. public static void main(String args[])   

6. {  

7. String str = "[{\"No\":\"17\",\"Name\":\"Andrew\"},{\"No\":\"18\",\"Name\":\"Peter\"}, {\"No\":\"19\",\"Name\":\"Tom\"}]";  

8. JSONArray array = new JSONArray(str);  

9. for(int i=0; i < array.length(); i++)   

10. {  

11. JSONObject object = array.getJSONObject(i);  

12. System.out.println(object.getString("No"));  

13. System.out.println(object.getString("Name"));  

14. }  

15. }  

16. }  

Output:

17
Andrew
18
Peter
19
Tom

Let's see another example.

JsonStringToJsonObjectExample2.java

1. import org.json.*;  

2. public class JsonStringToJsonObjectExample2  

3. {  

4. public static void main(String[] args)   

5. {  

6. String string = "{\"name\": \"Sam Smith\", \"technology\": \"Python\"}";  

7. JSONObject json = new JSONObject(string);  

8. System.out.println(json.toString());  

9. String technology = json.getString("technology");  

10. System.out.println(technology);  

11. }  

12. }  

Output:

Sam Smith
Python

Answer 24

Using org.json library:

try {
     JSONObject jsonObject = new JSONObject("{\"phonetype\":\"N95\",\"cat\":\"WP\"}");
}catch (JSONException err){
     Log.d("Error", err.toString());
}

Answer 25

you to create JSON object from JSON formatted String e.g. Gson from Google, Jackson, and json-simple. In this tutorial, you will learn how to use these 3 main libraries to do this conversion with step by step examples.

Even though you can use a simple or complex JSON String like with lots of attributes and JSON arrays, I'll use following JSON String for example purpose:

jsonString = {
  "name" : "Ronaldo",
  "sport" : "soccer",
  "age" : 25,
  "id" : 121,
  "lastScores" : [ 2, 1, 3, 5, 0, 0, 1, 1 ]
}

It's simple, has 5 attributes, two of which are String and the other two are numeric. One attribute, lastScore is a JSON array.
 

String to JSON Object using Gson

The Gson is an open-source library to deal with JSON in Java programs. It comes from none other than Google, which is also behind Guava, a common purpose library for Java programmers. You can convert JSON String to Java object in just 2 lines by using Gson as shown below :
 

Gson g = new Gson();
Player p = g.fromJson(jsonString, Player.class)

You can also convert a Java object to JSON by using toJson() method as shown below
 

String str = g.toJson(p);

JSON String to Java object using JSON-Simple

The JSON-Simple is another open-source library which supports JSON parsing and formatting. The good thing about this library is its small size, which is perfect for memory constraint environments like J2ME and Android.
 

JSONParser parser = new JSONParser();
JSONObject json = (JSONObject) parser.parse(stringToParse);

The good thing about json-simple is that it is also JDK 1.2 compatible, which means you can use it on a legacy project which is not yet in Java 5.