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How to create Json Array using Object Model?


This page shows how to create Json array using Object Model.

Note: Refer How to read Json data using JsonReader? page for dependent libraries.

Java example to create json array:

package com.javaapi.json.examples;

import java.io.StringWriter;

import javax.json.Json;
import javax.json.JsonArray;
import javax.json.JsonArrayBuilder;
import javax.json.JsonObject;
import javax.json.JsonObjectBuilder;
import javax.json.JsonWriter;

public class CreateJsonObjEx {

	public static void main(String a[]){
		
		JsonObjectBuilder jsonBuilder = Json.createObjectBuilder();
		jsonBuilder.add("emp_name", "Nataraj G");
		jsonBuilder.add("emp_id", 1016);
		jsonBuilder.add("salary", 20000);
		
		// create Json array with only values
		JsonArrayBuilder plnArrBld = Json.createArrayBuilder();
		plnArrBld.add("Rakesh");
		plnArrBld.add("John");
		JsonArray arr = plnArrBld.build();
		// the array got created, add it to the json as a child element
		jsonBuilder.add("direct_contacts", arr);
		
		// create an array of key-value pairs
		JsonArrayBuilder kvArrBld = Json.createArrayBuilder();
		// create each key-value pair as seperate object and add it to the array
		kvArrBld.add(Json.createObjectBuilder().add("email", "[email protected]").build());
		kvArrBld.add(Json.createObjectBuilder().add("mobile", "123123123123").build());
		
		JsonArray contactsArr = kvArrBld.build();
		// add contacts array object
		jsonBuilder.add("contacts", contactsArr);
		
		JsonObject empObj = jsonBuilder.build();
		// here we are writing to String writer. 
		// if you want you can write it to a file as well
		StringWriter strWtr = new StringWriter();
        JsonWriter jsonWtr = Json.createWriter(strWtr);
        jsonWtr.writeObject(empObj);
        jsonWtr.close();
        
        System.out.println(strWtr.toString());
	}
}

Output:
{
    "emp_name": "Nataraj G",
    "emp_id": 1016,
    "salary": 20000,
    "direct_contacts": [
        "Rakesh",
        "John"
    ],
    "contacts": [
        {
            "email": "[email protected]"
        },
        {
            "mobile": "123123123123"
        }
    ]
}
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Java API for JSON processing examples

  1. How to read Json data using JsonReader?
  2. How to read Json array data using JsonArray?
  3. How to create Json Object using Object Model?
  4. How to create Json Array using Object Model?
  5. How to create Json Object using Streaming Model API?
  6. How to create Json Array using Streaming Model API?
Knowledge Centre
What is transient variable?
Transient variables cannot be serialized. During serialization process, transient variable states will not be serialized. State of the value will be always defaulted after deserialization.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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