Is this compatible with Kotlin Multiplatform (KMP)?

Yes. The default kotlinx.serialization engine is the standard multiplatform serialization library for Kotlin, running across Android, iOS, JVM, Desktop, and WebAssembly targets.

JSON to Kotlin Data Class Converter

Convert JSON payloads into Kotlin data classes with kotlinx.serialization @Serializable or Moshi annotations, null safety, and keyword escaping.

Target:

Load Template:

JSON Input21 lines · 507 chars

Kotlin.kt

Generated Kotlin code will appear here

Paste or type valid JSON on the left to see instant, production-ready models.

Ready to compile · Deterministic output.kt

100% Client-Side Privacy: Your JSON is parsed and compiled entirely in your browser using local Web APIs. Nothing is sent to any server.

Zero Network Transfer

What is the JSON to Kotlin Converter?

The PriyGop JSON to Kotlin Converter generates idiomatic Kotlindata class models from JSON. Built for modern Android, server-side Ktor, and Kotlin Multiplatform (KMP) development, it creates compile-ready data models withkotlinx.serialization or Moshi annotations.

Kotlin Generation Features

Data Classes: Automatic copy(), equals(), and hashCode() support.
Null Safety: Nullable or optional fields are typed as String? = null.
Kotlinx Serialization / Moshi: Toggle between official @Serializable + @SerialName or Moshi.
Keyword Escaping: Kotlin reserved keywords (such as val, var, is) are automatically escaped with backticks.

Our Tool Features

Why developers and engineers prefer this tool for everyday development workflows.

Cross-Device Compatibility

Works seamlessly on all modern desktop, tablet, and mobile browsers including Chrome, Firefox, Safari, Edge on Windows, macOS, Linux, Android, and iOS.

Fast In-Browser Execution

Processes your data in real-time directly inside your browser. No queue wait times, no network round-trips, and zero latency.

100% Client-Side Privacy

Your code, tokens, passwords, and files are never transmitted to any external server or saved in logs. Everything runs locally in memory.

Instant File & Clipboard Input

Supports one-click sample loading, file drag-and-drop, and pasting directly from your clipboard (Ctrl + V) for effortless workflows.

Strict Standards Compliant

Built strictly according to official specifications (RFCs, W3C, ISO, and standard cryptographic algorithms) ensuring accurate output every time.

Unlimited Free Usage

No registration, no accounts, no subscriptions, and no hidden daily quotas. Use this tool as many times as you need without restrictions.

Recent Updates & Improvements

Continuously maintained and improved based on developer feedback.

Client-Side Speed & Performance UpgradeRecent Update

Optimized processing algorithms with Web Workers and native browser APIs (SubtleCrypto, Canvas 2D) for instantaneous zero-latency execution.

Clipboard Paste & Drag-and-Drop AddedFeature Added

Added instant clipboard pasting (Ctrl + V) and drag-and-drop file support to accelerate developer productivity without manual downloads.

Enhanced Mobile & Touch Device ExperienceUI/UX Update

Redesigned responsive touch controls, flexible copy buttons, and camera preview framing for mobile and tablet browsers.

How To Use JSON to Kotlin Data Class Converter Online?

Follow these quick steps to get instant, accurate results in seconds.

Input JSON

Paste your API response or data payload.

Paste any valid JSON string into the editor.
Click 'Sample' to test a preloaded user record.

JSON PayloadClient-Side

{
  "id": 101,
  "user_name": "alex",
  "avatar_url": null
}

Instant ExecutionReady

Configure Kotlin Options

Choose kotlinx.serialization or Moshi and configure package.

Select kotlinx.serialization for modern Android/KMP.
Select Moshi for legacy Retrofit applications.
Enter your package name.

Kotlin Data ClassClient-Side

@Serializable
data class User(
    @SerialName("user_name") val userName: String
)

Instant ExecutionReady

Download Kotlin File (.kt)

Export clean code directly into your Android Studio project.

Click 'Copy Code' or 'Download' to save the .kt file.

Usage in KotlinClient-Side

val user = Json.decodeFromString<User>(responseBody)

Instant ExecutionReady

Supported Formats & Syntax Examples

Common input data types and real-world representations supported by this tool.

Kotlinx Serialization Data Class

Kotlinx

Clean data class with @SerialName and null defaults.

Example Syntax

package com.example.models

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

@Serializable
data class User(
    @SerialName("id") val id: Long,
    @SerialName("user_name") val userName: String,
    @SerialName("avatar_url") val avatarUrl: String? = null
)

Default null values allow safe deserialization when optional keys are absent.

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package com.example.models import kotlinx.serialization.Serializable import kotlinx.serialization.SerialName @Serializable data class User( @SerialName("id") val id: Long, @SerialName("user_name") val userName: String, @SerialName("avatar_url") val avatarUrl: String? = null )