Kotlin – Convert Object to/from JSON with Jackson 2.x

This tutorial shows you how to use Jackson 2.x to convert Kotlin object to/from JSON.

I. Technology

– Java 1.8
– Kotlin 1.1.2
– Maven 3.5.1

II. Overview

1. Goal

Convert JSON string/JSON file/JSON url to Person(name:String,age:Int,messages:List) Kotlin Object, then convert Person object to JSON string/JSON file.

2. Steps to do

– add Dependency:

– import com.fasterxml.jackson.module.kotlin.*
– use ObjectMapper instance:

III. Practice

0. Person Class

1. Json String/URL/File to Object

Check Result:

2. Object to Json String/File

Check Result:

IV. More Practice

1. Json array format to List

Result:

2. Json to Map

Result:

By JavaSampleApproach | August 29, 2017.


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