In this tutorials, I am going to show you how to format JSON output using Jackson’s PrettyPrinter.
Format JSON Output PrettyPrinter :
We can format the JSON string with a readable format. In the previous tutorials, when we convert java Employee object to JSON, or convert Java Map to JSON string in both cases we got the JSON output in a single line like below:
{"studentId":1001,"studentName":"Rahul","roleNumber":"54","standard":"5th"}
If we want to format the above output like below:
{ "studentId" : "1001", "studentName" : "Rahul", "roleNumber" : "54", "standard" : "5th" }
We can format the JSON output using writerWithDefaultPrettyPrinter() method available in ObjectMapper class.
Format JSON Output Example :
[java]
package com.onlinetutorialspoint.json;
import java.util.HashMap;
import java.util.Map;
import org.codehaus.jackson.map.ObjectMapper;
public class Formate_JSON_Output {
public static void main(String[] args) {
Map<String,String> scoreMap = new HashMap<String,String>();
scoreMap.put("Dhoni", "102");
scoreMap.put("Yuvraj", "94");
scoreMap.put("Raina", "82");
scoreMap.put("Kohli", "120");
ObjectMapper mapperObj = new ObjectMapper();
try {
String jsonFormat = mapperObj.writerWithDefaultPrettyPrinter().writeValueAsString(scoreMap);
System.out.println(jsonFormat);
} catch (Exception e) {
e.printStackTrace();
}
}
}
[/java]
Output:
{ "Kohli" : "120", "Yuvraj" : "94", "Dhoni" : "102", "Raina" : "82" }
Happy Learning 🙂