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

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

Hope this helps

Answer 2

//package details

import org.json.simple.JsonObject;

import org.json.simple.Jsoner;

//logic

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

Answer 3

{
"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 4

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 5

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 6

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 7

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      "url": "https://api.github.com/users/helios66",
      "html_url": "https://github.com/helios66",
      "followers_url": "https://api.github.com/users/helios66/followers",
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      "gists_url": "https://api.github.com/users/helios66/gists{/gist_id}",
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      "following_url": "https://api.github.com/users/KingsMentor/following{/other_user}",
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      "starred_url": "https://api.github.com/users/KingsMentor/starred{/owner}{/repo}",
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      "organizations_url": "https://api.github.com/users/KingsMentor/orgs",
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      "following_url": "https://api.github.com/users/kizitonwose/following{/other_user}",
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      "url": "https://api.github.com/users/emmanuelkehinde",
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      "following_url": "https://api.github.com/users/emmanuelkehinde/following{/other_user}",
      "gists_url": "https://api.github.com/users/emmanuelkehinde/gists{/gist_id}",
      "starred_url": "https://api.github.com/users/emmanuelkehinde/starred{/owner}{/repo}",
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      "organizations_url": "https://api.github.com/users/emmanuelkehinde/orgs",
      "repos_url": "https://api.github.com/users/emmanuelkehinde/repos",
      "events_url": "https://api.github.com/users/emmanuelkehinde/events{/privacy}",
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      "type": "User",
      "site_admin": false,
      "score": 1.0
    },
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      "gravatar_id": "",
      "url": "https://api.github.com/users/SeunAdelekan",
      "html_url": "https://github.com/SeunAdelekan",
      "followers_url": "https://api.github.com/users/SeunAdelekan/followers",
      "following_url": "https://api.github.com/users/SeunAdelekan/following{/other_user}",
      "gists_url": "https://api.github.com/users/SeunAdelekan/gists{/gist_id}",
      "starred_url": "https://api.github.com/users/SeunAdelekan/starred{/owner}{/repo}",
      "subscriptions_url": "https://api.github.com/users/SeunAdelekan/subscriptions",
      "organizations_url": "https://api.github.com/users/SeunAdelekan/orgs",
      "repos_url": "https://api.github.com/users/SeunAdelekan/repos",
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      "received_events_url": "https://api.github.com/users/SeunAdelekan/received_events",
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      "site_admin": false,
      "score": 1.0
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      "gravatar_id": "",
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      "html_url": "https://github.com/cornzyblack",
      "followers_url": "https://api.github.com/users/cornzyblack/followers",
      "following_url": "https://api.github.com/users/cornzyblack/following{/other_user}",
      "gists_url": "https://api.github.com/users/cornzyblack/gists{/gist_id}",
      "starred_url": "https://api.github.com/users/cornzyblack/starred{/owner}{/repo}",
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      "organizations_url": "https://api.github.com/users/cornzyblack/orgs",
      "repos_url": "https://api.github.com/users/cornzyblack/repos",
      "events_url": "https://api.github.com/users/cornzyblack/events{/privacy}",
      "received_events_url": "https://api.github.com/users/cornzyblack/received_events",
      "type": "User",
      "site_admin": false,
      "score": 1.0
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      "html_url": "https://github.com/timi-codes",
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      "following_url": "https://api.github.com/users/chalu/following{/other_user}",
      "gists_url": "https://api.github.com/users/chalu/gists{/gist_id}",
      "starred_url": "https://api.github.com/users/chalu/starred{/owner}{/repo}",
      "subscriptions_url": "https://api.github.com/users/chalu/subscriptions",
      "organizations_url": "https://api.github.com/users/chalu/orgs",
      "repos_url": "https://api.github.com/users/chalu/repos",
      "events_url": "https://api.github.com/users/chalu/events{/privacy}",
      "received_events_url": "https://api.github.com/users/chalu/received_events",
      "type": "User",
      "site_admin": false,
      "score": 1.0
    },
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      "gravatar_id": "",
      "url": "https://api.github.com/users/yomiolatunji",
      "html_url": "https://github.com/yomiolatunji",
      "followers_url": "https://api.github.com/users/yomiolatunji/followers",
      "following_url": "https://api.github.com/users/yomiolatunji/following{/other_user}",
      "gists_url": "https://api.github.com/users/yomiolatunji/gists{/gist_id}",
      "starred_url": "https://api.github.com/users/yomiolatunji/starred{/owner}{/repo}",
      "subscriptions_url": "https://api.github.com/users/yomiolatunji/subscriptions",
      "organizations_url": "https://api.github.com/users/yomiolatunji/orgs",
      "repos_url": "https://api.github.com/users/yomiolatunji/repos",
      "events_url": "https://api.github.com/users/yomiolatunji/events{/privacy}",
      "received_events_url": "https://api.github.com/users/yomiolatunji/received_events",
      "type": "User",
      "site_admin": false,
      "score": 1.0
    },
    {
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      "avatar_url": "https://avatars2.githubusercontent.com/u/2240178?v=4",
      "gravatar_id": "",
      "url": "https://api.github.com/users/larikraun",
      "html_url": "https://github.com/larikraun",
      "followers_url": "https://api.github.com/users/larikraun/followers",
      "following_url": "https://api.github.com/users/larikraun/following{/other_user}",
      "gists_url": "https://api.github.com/users/larikraun/gists{/gist_id}",
      "starred_url": "https://api.github.com/users/larikraun/starred{/owner}{/repo}",
      "subscriptions_url": "https://api.github.com/users/larikraun/subscriptions",
      "organizations_url": "https://api.github.com/users/larikraun/orgs",
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}

Comments

What about this?

Answer 8

There are lots of tools for this....

Comments

Which tools can be used??

Answer 9

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 10

you can use google gson.

Answer 11

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

Answer 12

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 13

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 14

Using org.json library:

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

Answer 15

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.