JSONToTable

JSON to Kotlin Converter

Convert JSON data to Kotlin data classes with Gson support

JSON Input

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Kotlin Output

Kotlin code will appear here

Paste JSON in the input area to get started

How to Convert JSON to Kotlin Data Classes - Step by Step Guide

Step 1

Input Your JSON Data

Start by adding your JSON data that needs to be converted to Kotlin data classes. Perfect for Android development and API integration.

Example: Try This JSON Data

Copy and paste this JSON example to see how it works: 📱

{
  "userId": 12345,
  "username": "kotlindev",
  "email": "dev@android.com",
  "isActive": true,
  "preferences": [
    "dark_mode",
    "notifications",
    "auto_sync"
  ],
  "profile": {
    "firstName": "Android",
    "lastName": "Developer",
    "age": 28,
    "country": "USA"
  }
}
Step 2

Configure Kotlin Options

Customize how your JSON is converted to Kotlin data classes! ⚙️ Choose class names and serialization options.

•
Data classes: Generate immutable Kotlin data classes with automatic equals, hashCode, and toString
•
Gson annotations: Generate @SerializedName annotations for JSON binding
•
Nested classes: Handle complex JSON hierarchies with nested data classes
•
Type mapping: Automatic Kotlin type mapping from JSON data types
Step 3

Get Generated Kotlin Code

Watch the transformation! ✨ Your JSON structure becomes clean, typed Kotlin data classes ready for Android development.

Kotlin Code Output

Your JSON becomes these Kotlin data classes:

import com.google.gson.annotations.SerializedName

data class Profile(
    @SerializedName("firstName")
    val firstName: String,
    @SerializedName("lastName")
    val lastName: String,
    val age: Int,
    val country: String
)

data class Root(
    @SerializedName("userId")
    val userId: Int,
    val username: String,
    val email: String,
    @SerializedName("isActive")
    val isActive: Boolean,
    val preferences: List<String>,
    val profile: Profile
)
Step 4

Copy or Download Kotlin Code

Perfect! Now you can use your Kotlin data classes in your Android applications for JSON processing. 🚀

•
Copy to clipboard for immediate use in your Android projects
•
Download .kt files for integration into your Android Studio project
•
Use with frameworks like Retrofit and Gson
•
Android applications and mobile development

What is JSON to Kotlin Conversion? 📱

JSON to Kotlin conversion transforms JSON data structures into Kotlin data classes with Gson annotations for seamless data binding in Android applications. This process analyzes JSON structure and generates Kotlin data classes that can serialize and deserialize JSON data, making it easy to work with APIs in Android development.

The generated Kotlin data classes include proper property types, @SerializedName annotations for field mapping, and immutable val properties, enabling type-safe JSON handling in Android applications and Kotlin-based web services.

Frequently Asked Questions

What Kotlin annotations are generated for JSON binding?

The tool generates Gson annotations like @SerializedName("fieldName") for field name mapping between JSON and Kotlin properties. This ensures proper JSON serialization and deserialization in Android applications.

Can I use the generated classes with Retrofit and Android?

Absolutely! The generated Kotlin data classes work perfectly with Retrofit, Gson, and other Android networking libraries. They integrate seamlessly with API calls, response parsing, and data binding in Android applications.

What's the difference between data classes and regular classes?

Data classes automatically generate equals(), hashCode(), toString(), and copy() methods. They use immutable val properties and are perfect for representing data from JSON APIs in a concise, type-safe way.

What Kotlin data types are used for JSON values?

JSON strings become Kotlin String, numbers become Int/Double, booleans become Boolean, arrays become List<T>, and objects become custom data classes. The tool intelligently maps JSON types to appropriate Kotlin types.

Do I need to add Gson dependencies to my Android project?

Yes, you'll need to add Gson to your app's build.gradle dependencies. Add: implementation 'com.google.code.gson:gson:2.10.1' to use the generated data classes with JSON serialization.

Is the JSON to Kotlin converter free to use?

Yes, completely free with no limitations on JSON complexity, class generation, or usage frequency. No registration required, and you can generate unlimited Kotlin data classes from JSON data at no cost.