How to Convert a JSON String to a Map in Kotlin

How to Convert a JSON String to a Map in Kotlin ?

Answer

To convert a JSON string to a map in Kotlin, you can use the kotlinx.serialization library, which provides functions to parse JSON data and convert it into a map.

✐ Examples

1 Converting a JSON String to a Map

We can convert a JSON string to a map in Kotlin by using the kotlinx.serialization library's Json.decodeFromString function to parse the JSON string and convert it into a map.

For example,

We start by adding the necessary dependencies for the kotlinx.serialization library in the build.gradle file.
We import the required classes from the kotlinx.serialization library.
We define a JSON string containing key-value pairs.
We use the Json.decodeFromString function to parse the JSON string into a map.
We print the resulting map to the console to verify the conversion.

Kotlin Program

import kotlinx.serialization.json.Json
import kotlinx.serialization.decodeFromString

fun main() {
    // Define a JSON string
    val jsonString = "{\"1\": 10, \"2\": 20, \"3\": 30, \"4\": 40, \"5\": 50}"

    // Parse the JSON string into a map
    val myMap: Map<String, Int> = Json.decodeFromString(jsonString)

    // Print the resulting map
    println("Map from JSON string:")
    for ((key, value) in myMap) {
        println("$key: $value")
    }
}

Output

Map from JSON string:
1: 10
2: 20
3: 30
4: 40
5: 50

Summary

In this tutorial, we learned How to Convert a JSON String to a Map in Kotlin language with well detailed examples.

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