Pretty Print JSON with Java

Note: This has been adapted from steps from

When we want to pretty print a JSON object in Java, we can take advantage of the Jackson library's serialisation of objects.

For this to happen, all we need is to have a Plain Old Java Object (POJO) that is the data object for the class, with the relevant markup for JSON properties:

import com.fasterxml.jackson.annotation.JsonProperty;

class TheObject {
    public String wibble;

    public int foo;

Now we can use an instance of Jackson's ObjectMapper class to return a String with the pretty-printed JSON value, which we can then print out as we want:

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

public void prettyPrintObject() {
    ObjectMapper objectMapper = new ObjectMapper();
    TheObject o = new TheObject();
    o.wibble = "hello there"; = 1234; = new HashMap<>();"abc", "def");

    String value = objectMapper.writerWithDefaultPrettyPrinter()

This gives us a nice pretty-printed result:

  "wibble" : "hello there",
  "foo" : 1234,
  "map" : {
    "abc" : "def"

This was tested with Jackson v2.9.8.

Written by Jamie Tanna's profile image Jamie Tanna on , and last updated on .

Content for this article is shared under the terms of the Creative Commons Attribution Non Commercial Share Alike 4.0 International, and code is shared under the Apache License 2.0.


This post was filed under articles.

This post is part of the series pretty-print-json.

Related Posts

Other posts you may be interested in:

Interactions with this post

Interactions with this post

Below you can find the interactions that this page has had using WebMention.

Have you written a response to this post? Let me know the URL:

Do you not have a website set up with WebMention capabilities? You can use Comment Parade.