Convert Java Object to Json String using Jackson API

JSON Stand for JavaScript Object Notation. It’s a standard text-based format which shows structured data based on JavaScript object syntax. It is commonly used for transmitting data in web applications. JSON is highly recommended to transmit data between a server and web application.

To convert a Java object into JSON, the following methods can be used:

  • GSON
  • JACKSON API

In this article, Java object is converted into the JSON using Jackson API:

The steps to do this are as follows:

  1. Add jar files of Jackson (in case of Maven project add Jackson dependencies in pom.xml file)
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    <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.5.3</version>
    </dependency>

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    Below is the screenshot showing this step:

  2. Create a POJO (Plain Old Java Object) to be converted into JSON

    Java Class

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    package com.Geeks;
      
    public class Organisation {
        private String organisation_name;
        private String description;
        private int Employees;
      
        // Calling getters and setters
        public String getOrganisation_name()
        {
            return organisation_name;
        }
      
        public void setOrganisation_name(String organisation_name)
        {
            this.organisation_name = organisation_name;
        }
      
        public String getDescription()
        {
            return description;
        }
      
        public void setDescription(String description)
        {
            this.description = description;
        }
      
        public int getEmployees()
        {
            return Employees;
        }
      
        public void setEmployees(int employees)
        {
            Employees = employees;
        }
      
        // Creating toString
        @Override
        public String toString()
        {
            return "Organisation [organisation_name="
                + organisation_name
                + ", description="
                + description
                + ", Employees="
                + Employees + "]";
        }
    }

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    Below is the screenshot showing this step:

  3. Create a Java class for converting the Organisation object into JSON. Convert the object into JSON using ObjectMapper class of Jackson API.
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    package com.Geeks;
      
    import java.io.IOException;
    import org.codehaus.jackson.map.ObjectMapper;
    import com.Geeks.Organisation;
      
    public class ObjectToJson {
        public static void main(String[] a)
        {
      
            // Creating object of Organisation
            Organisation org = new Organisation();
      
            // Insert the data into the object
            org = getObjectData(org);
      
            // Creating Object of ObjectMapper define in Jakson Api
            ObjectMapper Obj = new ObjectMapper();
      
            try {
      
                // get Oraganisation object as a json string
                String jsonStr = Obj.writeValueAsString(org);
      
                // Displaying JSON String
                System.out.println(jsonStr);
            }
      
            catch (IOException e) {
                e.printStackTrace();
            }
        }
      
        // Get the data to be inserted into the object
        public static getObjectData(Organisation org)
        {
      
            // Insert the data
            org.setName("GeeksforGeeks");
            org.setDescription("A computer Science portal for Geeks");
            org.setEmployees(2000);
      
            // Return the object
            return org;
        }

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  4. Execute the process.
  5. The output in the JSON will be as below:
    Output
    {
      "organisation_name" : "GeeksforGeeks",
      "description" : "A computer Science portal for Geeks",
      "Employee" : "2000"
    }
    

    Below is the screenshot showing this output:



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