How to Map Each Column Of Json Array In Kotlin?

7 minutes read

To map each column of a JSON array in Kotlin, you can use the Gson library to parse the JSON string into a data class representing the structure of the JSON object. You can then iterate over the array and access each column by its corresponding property in the data class. Alternatively, you can use the kotlinx.serialization library to deserialize the JSON string into a Kotlin data class. Once you have the data class representing the JSON structure, you can easily access each column in the array using the properties of the data class.

Best Kotlin Books to Read in 2024

1
Atomic Kotlin

Rating is 5 out of 5

Atomic Kotlin

2
Kotlin in Action

Rating is 4.9 out of 5

Kotlin in Action

3
Kotlin Cookbook: A Problem-Focused Approach

Rating is 4.8 out of 5

Kotlin Cookbook: A Problem-Focused Approach

4
Head First Kotlin: A Brain-Friendly Guide

Rating is 4.7 out of 5

Head First Kotlin: A Brain-Friendly Guide

5
Kotlin Programming: The Big Nerd Ranch Guide (Big Nerd Ranch Guides)

Rating is 4.6 out of 5

Kotlin Programming: The Big Nerd Ranch Guide (Big Nerd Ranch Guides)

6
Effective Kotlin: Best Practices (Kotlin for Developers Book 5)

Rating is 4.5 out of 5

Effective Kotlin: Best Practices (Kotlin for Developers Book 5)

7
Java to Kotlin: A Refactoring Guidebook

Rating is 4.4 out of 5

Java to Kotlin: A Refactoring Guidebook

8
Learn to Program with Kotlin: From the Basics to Projects with Text and Image Processing

Rating is 4.3 out of 5

Learn to Program with Kotlin: From the Basics to Projects with Text and Image Processing


How to serialize a JSON array in Kotlin?

To serialize a JSON array in Kotlin, you can use the Gson library. First, you need to add the Gson library to your project. You can do this by adding the following dependency in your build.gradle file:

1
implementation 'com.google.code.gson:gson:2.8.5'


Next, you can create a data class to represent the structure of your JSON array. For example:

1
data class Person(val name: String, val age: Int)


Then, you can create a list of Person objects and convert it to a JSON array using Gson:

1
2
3
4
5
6
7
8
9
val personList = listOf(
    Person("John", 30),
    Person("Jane", 25)
)

val gson = Gson()
val jsonArray = gson.toJsonTree(personList).asJsonArray

println(jsonArray)


This will print the JSON array representation of the list of Person objects.


What is JSON mapping in Kotlin?

JSON mapping in Kotlin refers to the process of converting a JSON string (or object) into a Kotlin data class or vice versa. This is often done using a library such as Gson or Moshi, which provide the necessary functionality to serialize and deserialize JSON data. By mapping JSON data to Kotlin data classes, developers can easily work with JSON data in a type-safe manner, making it easier to manipulate and use the data within their Kotlin code.


How to map JSON objects in Kotlin?

To map JSON objects in Kotlin, you can use libraries such as Gson or Jackson. Here's a simple example using Gson:

  1. Add Gson dependency to your app's build.gradle file:
1
2
3
dependencies {
    implementation 'com.google.code.gson:gson:2.8.8'
}


  1. Create a data class that represents the structure of the JSON object:
1
data class Person(val name: String, val age: Int)


  1. Convert JSON string to Kotlin object using Gson:
1
2
3
4
5
6
7
import com.google.gson.Gson

fun main() {
    val json = """{"name": "John", "age": 30}"""
    val person = Gson().fromJson(json, Person::class.java)
    println("Name: ${person.name}, Age: ${person.age}")
}


This will output:

1
Name: John, Age: 30


You can also convert Kotlin object to JSON string using Gson:

1
2
3
4
5
fun main() {
    val person = Person("Jane", 25)
    val json = Gson().toJson(person)
    println(json)
}


This will output:

1
{"name":"Jane","age":25}


This is just a basic example, but Gson and Jackson provide many more features for mapping JSON objects and handling different data structures. You can refer to their official documentation for more information on how to use them.

Twitter LinkedIn Telegram Whatsapp

Related Posts:

To parse JSON in Lua, you can use the JSON library. Here are the steps to achieve this:Install the JSON library: Download and include the JSON.lua file in your Lua project. Import the JSON library: Add the following line of code at the beginning of your Lua sc...
To convert a SQL result set to JSON in Groovy, you can follow these steps:Establish a connection to your database using a library like JDBC.Execute your SQL query and retrieve the result set.Iterate through each row of the result set.Create a Map object for ea...
Serializing and deserializing JSON in Kotlin involves converting JSON data into Kotlin objects and vice versa. Here's a step-by-step explanation of how to achieve this:Add the JSON serialization and deserialization library: Start by adding the necessary li...