JSON to Kotlin Data Class

Kotlin Data Classes with Serialization

Kotlin data classes are the idiomatic way to model JSON data. With kotlinx.serialization, you get compile-time safe serialization.

import kotlinx.serialization.Serializable
import kotlinx.serialization.SerialName

@Serializable
data class User(
    val id: Int,
    val name: String,
    @SerialName("is_active")
    val isActive: Boolean
)

Using Generated Classes

import kotlinx.serialization.json.Json

fun main() {
    val jsonString = """{"id": 1, "name": "Alice"}"""
    val user = Json.decodeFromString<User>(jsonString)
    println(user.name) // Alice

    val encoded = Json.encodeToString(user)
    println(encoded)
}

Common Use Cases

• Android Apps: Model API responses with Retrofit + kotlinx.serialization
• Ktor Backend: Request/response models for Ktor server applications
• Multiplatform: Shared data models for KMP projects
• Spring Boot: DTO classes for Spring Boot Kotlin applications

FAQ