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How to convert Map to JSON string using Jackson API?


This page shows how to convert java map to JSON string using Jackson's data binding.

Note: Refer How to convert Java object to JSON string? page for dependent libraries.

package com.java2novice.json.examples;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import org.codehaus.jackson.map.ObjectMapper;

public class MapToJsonEx {

	public static void main(String a[]){
		
		ObjectMapper mapperObj = new ObjectMapper();
		Map<String, String> inputMap = new HashMap<String, String>();
		inputMap.put("name", "Java2Novice");
		inputMap.put("site", "http://java2novice.com");
		// convert map to JSON String
		try {
			String jsonResp = mapperObj.writeValueAsString(inputMap);
			System.out.println(jsonResp);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

Output:
{"site":"http://java2novice.com","name":"Java2Novice"}
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Transient: The transient modifier applies to variables only and it is not stored as part of its object's Persistent state. Transient variables are not serialized.

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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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