Nikos Maravitsas

About Nikos Maravitsas

Nikos has graduated from the Department of Informatics and Telecommunications of The National and Kapodistrian University of Athens. Currently, his main interests are system’s security, parallel systems, artificial intelligence, operating systems, system programming, telecommunications, web applications, human – machine interaction and mobile development.

Enable Pretty Print JSON Output using Gson example

In this example we are going to see how to enalbe pretty printing in JSON. As you might have noticed in the previous examples the JSON output of our programs was not properly aligned and thus somehow hard to read.

For this demo we are going to use a simple Java class thay we used in the “Convert Java Object To / From JSON using Gson” tutorial.


import java.util.ArrayList;
import java.util.List;

public class Student {

	private int id;
	private String firstName;
	private String lastName;
	private int age;

	private List<String> list;

	public Student(String fname, String lname, int age, int id) {

		this.firstName = fname;
		this.lastName = lname;
		this.age = age; = id;

		this.list = new ArrayList<String>();


	public void setFirstName(String fname) {
		this.firstName = fname;

	public String getFirstName() {
		return this.firstName;

	public void setLastName(String lname) {
		this.lastName = lname;

	public String getLastName() {
		return this.lastName;

	public void setAge(int age) {
		this.age = age;

	public int getAge() {
		return this.age;

	public void setId(int id) { = id;

	public int getId() {

	public String toString() {
		return new StringBuffer(" First Name : ").append(this.firstName)
				.append(" Last Name : ").append(this.lastName)
				.append(" Age : ").append(this.age).append(" ID : ")
				.append(" " + this.list).toString();



public class GsonPrettyPrintingExample {

	public static void main(String[] args) {

		Student obj = new Student("Jack", "James", 10, 200);

		Gson prettyGson = new GsonBuilder().setPrettyPrinting().create();

		Gson uglyJson = new Gson();

		String pretJson = prettyGson.toJson(obj);

		System.out.println("Pretty printing: "+pretJson);

		String ugJason = uglyJson.toJson(obj);

		System.out.println("\nUgly printing: "+ugJason);



Pretty printing: {
  "id": 200,
  "firstName": "Jack",
  "lastName": "James",
  "age": 10,
  "list": [

Ugly printing: {"id":200,"firstName":"Jack","lastName":"James","age":10,"list":["Str1","Str2","Str3"]}

This was an example on how to enable pretty print JSON Output using Gson.

Do you want to know how to develop your skillset to become a Java Rockstar?

Subscribe to our newsletter to start Rocking right now!

To get you started we give you our best selling eBooks for FREE!

1. JPA Mini Book

2. JVM Troubleshooting Guide

3. JUnit Tutorial for Unit Testing

4. Java Annotations Tutorial

5. Java Interview Questions

6. Spring Interview Questions

7. Android UI Design

and many more ....

Given email address is already subscribed, thank you!
Oops. Something went wrong. Please try again later.
Please provide a valid email address.
Thank you, your sign-up request was successful! Please check your e-mail inbox.
Please complete the CAPTCHA.
Please fill in the required fields.
Examples Java Code Geeks and all content copyright © 2010-2015, Exelixis Media Ltd | Terms of Use | Privacy Policy | Contact
All trademarks and registered trademarks appearing on Examples Java Code Geeks are the property of their respective owners.
Java is a trademark or registered trademark of Oracle Corporation in the United States and other countries.
Examples Java Code Geeks is not connected to Oracle Corporation and is not sponsored by Oracle Corporation.
Do you want to know how to develop your skillset and become a ...
Java Rockstar?

Subscribe to our newsletter to start Rocking right now!

To get you started we give you two of our best selling eBooks for FREE!

Get ready to Rock!
You can download the complementary eBooks using the links below: