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Enable JSON pretty print using Jackson API


This page shows how to enable JSON pretty print using Jackson APIs.

Note: Refer How to convert Java object to JSON string? page for dependent libraries.

package com.java2novice.json.examples;

import java.io.IOException;

import org.codehaus.jackson.map.ObjectMapper;

import com.java2novice.json.models.Employee;

public class JsonPrettyPrintEx {

	public static void main(String a[]){
		
		Employee emp = new Employee();
		ObjectMapper mapperObj = new ObjectMapper();
		
		try {
			// get Employee object as a json string
			String jsonStr = mapperObj.writeValueAsString(emp);
			System.out.println("json output in compact mode:\n");
			System.out.println(jsonStr);
			String jsonPrettyStr 
					= mapperObj.writerWithDefaultPrettyPrinter().writeValueAsString(emp);
			System.out.println("\n\njson output in pretty print mode:\n");
			System.out.println(jsonPrettyStr);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

Output:
json output is in compact mode:

{"empId":1016,"name":"Nataraja Gootooru","designation":"Programmer","department":"Java2Novice","salary":20000}


json output is in pretty print mode:

{
  "empId" : 1016,
  "name" : "Nataraja Gootooru",
  "designation" : "Programmer",
  "department" : "Java2Novice",
  "salary" : 20000
}
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Jackson JSON examples

  1. How to convert Java object to JSON string?
  2. How to convert JSON string to Java object?
  3. How to convert JSON string to Map using Jackson API?
  4. How to convert Map to JSON string using Jackson API?
  5. Enable JSON pretty print using Jackson API
  6. How to rename JSON properties using Jackson annotations?
  7. How to ignore JSON property using Jackson annotations?
  8. How to order JSON elements using Jackson annotations?
  9. How to ignore json empty or null values using Jackson API in java?
  10. How to handle date in Json using Jackson api in java?
  11. How to read specific json node in Jackson api (tree model)?
  12. Jackson API client - how to read json from URL?
Knowledge Centre
Can you list serialization methods?
Serialization interface does not have any methods. It is a marker interface. It just tells the JVM that your class can be serializable.
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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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