Pretty Print JSON Using Jackson Library in Java

A Jackson API is a java based library and it can be useful to convert Java objects to JSON and JSON to Java Object. A Jackson API is faster than other API, needs less memory area and is good for the large objects. We can process a JSON in three different ways using Streaming API, Tree Model, and Data Binding.

We can Pretty print JSON using the writerWithDefaultPrettyPrinter() of ObjectMapper class, it is a factory method for constructing ObjectWriter that will serialize objects using the default pretty printer for indentation.

Syntax

public ObjectWriter writerWithDefaultPrettyPrinter()

Example

import java.io.IOException;
import com.fasterxml.jackson.databind.ObjectMapper;
public class PrettyPrintJsonJacksonTest {
   public static void main(String[] args) throws IOException {
      String data = "{\"Age\":30,\"Technologies\":            [\"Java\",\"Spark\",\"Python\"],\"Name\":\"Adithya\"}";
      ObjectMapper mapper = new ObjectMapper();
      Object json = mapper.readValue(data, Object.class);
      String jsonStr = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(json); // Pretty         print JSON
      System.out.println(jsonStr);
   }
}

Output

{
 "Age" : 30,
 "Technologies" : [ "Java", "Spark", "Python" ],
 "Name" : "Adithya"
}