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How to convert JSON string to Map using Jackson API?


This page shows how to convert JSON string to java map object 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;
import org.codehaus.jackson.type.TypeReference;

public class JsonToMapEx {

	public static void main(String a[]){
		
		String jsonStr = "{\"name\":\"Nataraj\", \"job\":\"Programmer\"}";
		Map<String,String> resultMap = new HashMap<String,String>();
		ObjectMapper mapperObj = new ObjectMapper();
		
		System.out.println("Input Json: "+jsonStr);
		try {
			resultMap = mapperObj.readValue(jsonStr, 
							new TypeReference<HashMap<String,String>>(){});
			System.out.println("Output Map: "+resultMap);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

Output:
Input Json: {"name":"Nataraj", "job":"Programmer"}
Output Map: {name=Nataraj, job=Programmer}
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Jackson JSON examples

  1. How to convert Java object to JSON string?
  2. How to convert JSON string to Java object?
  3. How to convert JSON string to Map using Jackson API?
  4. How to convert Map to JSON string using Jackson API?
  5. Enable JSON pretty print using Jackson API
  6. How to rename JSON properties using Jackson annotations?
  7. How to ignore JSON property using Jackson annotations?
  8. How to order JSON elements using Jackson annotations?
  9. How to ignore json empty or null values using Jackson API in java?
  10. How to handle date in Json using Jackson api in java?
  11. How to read specific json node in Jackson api (tree model)?
  12. Jackson API client - how to read json from URL?
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What is adapter class?
An adapter class provides the default implementation of all methods in an event listener interface. Adapter classes are very useful when you want to process only few of the events that are handled by a particular event listener interface. You can define a new class by extending one of the adapter classes and implement only those events relevant to you.
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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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