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How to enable pretty printing in Google gson APIs?


This page shows how to enable pretty printing in Google gson APIs.

Note: Refer How to convert java object to json string using Gson APIs? page for dependent libraries.

Here is the example to enable pretty printing in Google gson APIs:

package com.java2novice.json.gson;

import java.util.HashMap;
import java.util.Map;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

public class MapToJsonEx {

	public static void main(String a[]){
		
		Map<String, String> inputMap = new HashMap<String, String>();
		inputMap.put("name", "Java2Novice");
		inputMap.put("site", "http://java2novice.com");
		// convert map to JSON String
		// notice that we enabled pretty printing in the below line
		Gson gsonObj = new GsonBuilder().setPrettyPrinting().create();
		String jsonStr = gsonObj.toJson(inputMap);
		System.out.println(jsonStr);
	}
}

Output:
{
  "site": "http://java2novice.com",
  "name": "Java2Novice"
}
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Google gson examples

  1. How to convert java object to json string using Gson APIs?
  2. How to convert json string to java object using Gson APIs?
  3. How to convert map to json string using Gson APIs?
  4. How to enable pretty printing in Google gson APIs?
  5. How to rename JSON properties (@SerializedName) using Gson APIs?
  6. How to exclude json fields in Gson APIs?
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String Vs StringBuffer
We know that String is immutable object. We can not change the value of a String object once it is initiated. If we try to change the value of the existing String object then it creates new object rather than changing the value of the existing object. So incase, we are going to do more modificatios on String, then use StringBuffer. StringBuffer updates the existing objects value, rather creating new object.
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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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