PrettyPrintedJson.java

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;

/**
 * License : Apache License 2.0
 * 
 * @author Michael Bornholdt Nielsen mni@jarry.dk
 *
 */
public class PrettyPrintedJson {
	
	public static void main(String[] args) {
		
		try {
			
			StringBuilder sb = new StringBuilder();
			
			sb.append("{");
			sb.append("\"error\": \"Expected a ',' or '}' at 15 [character 16 line 1]\",");
			sb.append("\"object_or_array\": \"object\",");
			sb.append("\"error_info\": \"This error came from the org.json reference parser.\",");
			sb.append("\"validate\": false");
			sb.append("}");
			
			String jsonStringNoWhitespace = sb.toString();		
			
			System.out.println(" ..:: jsonStringNoWhitespace ::..");
			System.out.println(jsonStringNoWhitespace);
			System.out.println("");
			
			ScriptEngineManager manager = new ScriptEngineManager();
			ScriptEngine scriptEngine = manager.getEngineByName("nashorn");
			scriptEngine.put("jsonString", jsonStringNoWhitespace);
			scriptEngine.eval("result = JSON.stringify(JSON.parse(jsonString), null, 3)");
			String prettyPrintedJson = (String) scriptEngine.get("result");	
			
			System.out.println(" ..:: prettyPrintedJson ::..");
			System.out.println(prettyPrintedJson);
			
		} catch (Exception e) {
			e.printStackTrace();
		}
		
	}

}