Johathan  Boehm

Johathan Boehm


Reading and Writing JSON in Kotlin with Jackson

In this article we’ll be taking a look at how to read and write JSON files in Kotlin, specifically, using the Jackson library.

Jackson Dependency

To utilize Jackson, we’ll want to add its jackson-module-kotlin dependency to our project. If you’re using Maven, you can simply add:


Or, if you’re using Gradle, you can add:

implementation 'com.fasterxml.jackson.module:jackson-module-kotlin:2.12.1'

With the dependency in place, let’s define a JSON object we’ll want to read:

   "fullName":"Best Admin"

Reading a JSON Object to Kotlin Object

Let’s take a look at how we can deserialize a JSON object into a Kotlin object. Since we’ll want to convert the JSON contents into a Kotlin object, let’s define a User data class:

data class User (
    val id: Int,
    val username: String,
    val password: String,
    val fullName: String

Then, we’ll want to instantiate the object mapper, which can easily be done with:

import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper

// Registering the Kotlin module with the ObjectMpper instance
val mapper = jacksonObjectMapper()

// JSON String
val jsonString = """{
    "fullName":"Best Admin"

With that done, we can pass JSON contents into our ObjectMapper methods, such as readValue(), as usual for Jackson:

// Read data from a JSON string
val userFromJson = mapper.readValue<User>(jsonString)
// Or
val userFromJsonWithType: User = mapper.readValue(jsonString)

If we print the value of userFromJson we’ll see something like this:

User(id=101, username=admin, password=Admin123, fullName=Best Admin)

The readValue() function can be used with or without the Class parameter, as you saw a little earlier with the two variables (userFromJson and userFromJsonWithType).

Note: Using the function without the Class parameter will materialize the type and automatically create a TypeReference for Jackson.


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Reading and Writing JSON in Kotlin with Jackson
Brandon  Adams

Brandon Adams


What is JSON? | JSON Objects and JSON Arrays | Working with JSONs Tutorial

In this video, we work with JSONs, which are a common data format for most web services (i.e. APIs). Thank you for watching and happy coding!

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Kotlin - Convert Object to/from JSON with Jackson 2.x » grokonez

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:

More at:

#kotlin #json #jackson

Juned Ghanchi


Kotlin App Development Company in India, Hire Kotlin Developers

We are a prime Kotlin app developer in India. We build and provide the best personalized Android apps, migration services, ongoing maintenance, and management.

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Autumn  Blick

Autumn Blick


JSON Parsing in Android - Step by Step Implementation

JSON Structures in Android

JSON uses two types of brackets that are as follows:

  • [] – To declare the elements of Array in JSON, they’re written in square brackets.
  • {} – To create JSON objects, the elements are written in curly brackets.

JSON has the following types of structures that are:

1. JSON Objects

The elements inside the curly brackets are known as Objects.

2. JSON Array

A list of values, known as Arrays.

3. JSON Key-Value

This data is stored as a pair of keys and values. Here the keys can be a name, a number for which the values can be Seema, 98767586 etc.

Why JSON Parsing in Android over XML?

Let us see some reasons for why to choose JSON over XML:

  • It is much easier and quicker with high performance
  • It can use arrays
  • Its libraries do not depend on other libraries
  • The codes written in JSON are short, clean and easy to understand
  • It is free to open use and open-source tool
  • In JSON value retrieval is easy
  • It has a fully automated way of serializing/deserializing JavaScript.
  • It is supported by many Ajax toolkits and most of the backend technologies.

Examples of XML and JSON

Let us see the code difference of JSON and XML files:

XML Example:

<?xml version= “1.0” encoding= “” ?>
  <name> Sia Sharma</name>
  <city> Chandigarh</city>
  <name>Dimple D’souza</name>
  <city> Nagpur</city>
  <name>Anna Jones</name>
  <city> Mumbai</city>

JSON Example:

{ “students”: [
{ “name”: “Sia Sharma”, “city”: “Chandigarh”},
{ “name”: “Prachi D’Souza”, “city”: “Nagpur”},
{ “name”: “Annas Jones”, “city”: “Mumbai”}

I hope the difference is all clear in front of you. This is how simple JSON is and how easily it could be understood.

#android tutorials #json parsing in android #json parsing in android example #json parsing in android step by step #json parsing with android #read json file android

Kennith  Blick

Kennith Blick


Reading and Writing to Files in Python - Intermediate Python Tutorial #2

In this Python tutorial, we will learn how to deal with text files in Python using the built-in open function. You will understand how to use the most important modes: read, write and append.
That’s not all! We will discuss about file parsing and touch important string methods used for that such as: strip( ) and split( ). Finally we wrap up with a parsing file exercise to practice the new concepts. After that video you will be confident to deal with text files which is a very important skill to have as a programmer.

Playlist: Intermediate Python Tutorials | Video #2
Access the codes here:

00:00 - Summary of the video
00:17 - Types of files
00:43 - How to open a file
01:17 - File modes
02:15 - How to read data from a file
03:00 - with statement
04:10 - readlines( ) method
05:05 - String: strip( ) method
06:22 - How to iterate over a file line by lin
08:47 - How to write data to a file
11:43 - How to append data to a file
12:37 - Exercise: Parsing a text file
16:14 - Converting data types
17:00 - Next video announcement

Photo by Mario Ho on Unsplash

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