Converting DynamoDB JSON to Standard JSON with Java

Question

I need to convert a AWS DYNAMODB JSON to a standard JSON object. so I can remove the data type from the DynamoDB JSON Something more like:

in DYNAMODB JSON:

Answer 1

Amazon has an internal utility that can do the core of the job in 1 line.

Map jsonMapWithId = InternalUtils.toSimpleMapValue(attributeValueMap);

A long version which contains some configurations:

import com.amazonaws.services.dynamodbv2.document.internal.InternalUtils;
import com.amazonaws.services.dynamodbv2.model.AttributeValue;
import java.lang.Map;
import java.lang.HashMap;

public class JsonConvert {
    public static void main(String[] args) {
        Map jsonMap = new HashMap();
        jsonMap.put("string", "foo");
        jsonMap.put("number", 123);
        Map innerMap = new HashMap();
        innerMap.put("key", "value");
        jsonMap.put("map", innerMap);
        AttributeValue attributeValue = InternalUtils.toAttributeValue(jsonMap);
        Map attributeValueMap = new HashMap();
        attributeValueMap.put("id", attributeValue);

        Map jsonMapWithId = InternalUtils.toSimpleMapValue(attributeValueMap);
        Map jsonMap = jsonMapWithId.get("id"); // This is a regular map, values are not Amazon AttributeValue

        Gson gson = new Gson(); 
        String json = gson.toJson(jsonMap); 

        System.out.println(json);
    }
}