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JSON to Kotlin

Generate Kotlin data classes from JSON instantly. Create Android, Ktor and kotlinx.serialization models for APIs with secure browser-based code generation.

Options

Input JSON

Paste or edit your JSON sample

Kotlin output

Kotlin data classes

Ready
@Serializable
data class Root(
    val id: Long,
    val name: String,
    val email: String,
    val active: Boolean,
    val score: Double,
    val tags: List<String>,
    val profile: Map<String, Any?>,
)

Why JSON to Kotlin?

Android and Ktor projects need data classes matching API JSON — generate them instantly.

This page presets Kotlin output so you can paste API JSON and ship typed code faster.

FAQ

How do I convert JSON to Kotlin?

Paste your JSON sample into the editor on this page. The Kotlin output updates live — copy it or download a .kt file.

Is JSON to Kotlin conversion free?

Yes. JSON to Kotlin conversion on WebioTools is free for normal usage and runs in your browser.

Is my JSON data sent to a server?

No. Code generation happens locally in your browser. Your JSON never leaves your device.

Can I use this for API responses?

Absolutely. Paste REST or GraphQL JSON responses to scaffold Kotlin definitions for your project.