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How to convert map to json string using Gson APIs?


This page shows how to convert map object to json string using Google gson API.

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

Here is the example to convert map to json string:

package com.java2novice.json.gson;

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

import com.google.gson.Gson;

public class MapToJsonEx {

	public static void main(String a[]){
		
		Gson gsonObj = new Gson();
		Map<String, String> inputMap = new HashMap<String, String>();
		inputMap.put("name", "Java2Novice");
		inputMap.put("site", "http://java2novice.com");
		// convert map to JSON String
		String jsonStr = gsonObj.toJson(inputMap);
		System.out.println(jsonStr);
	}
}

Output:
{"site":"http://java2novice.com","name":"Java2Novice"}
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Knowledge Centre
Procedural Vs Object-oriented Programs
In procedural program, programming logic follows certain procedures and the instructions are executed one after another. In OOP program, unit of program is object, which is nothing but combination of data and code.

In procedural program, data is exposed to the whole program whereas in OOPs program, it is accessible with in the object and which in turn assures the security of the code.
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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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