JSON to Language Struct / Class Generator
About JSON → Kotlin Data Class
The JSON to Kotlin Data Class Converter transforms JSON payloads and REST API responses into type-safe Kotlin data classes with Jackson (`@JsonProperty`), Moshi (`@Json`), and KotlinX Serialization (`@Serializable`) annotations.
How to Use JSON → Kotlin Data Class
Step 1
Paste your JSON data into the editor.
Step 2
Select Kotlin serialization framework (KotlinX, Moshi, Jackson, or Gson).
Step 3
Name your root class (e.g. `UserResponse`).
Step 4
Click "Copy Kotlin Code".
Practical Use Cases for JSON → Kotlin Data Class
Android & KMP Mobile App API Model Generation
Convert backend JSON responses into Kotlin data classes for Android Retrofit, Ktor HTTP clients, and Kotlin Multiplatform apps.
Generating KotlinX Serialization Models
Auto-generate `@Serializable` Kotlin models with camelCase property mappings and nullable type definitions.
Input & Output Examples
Converting JSON to Kotlin Data Class
`{ "user_id": 42, "name": "Alice", "is_active": true }``@Serializable\ndata class User(\n @SerialName("user_id") val userId: Long,\n val name: String,\n @SerialName("is_active") val isActive: Boolean\n)`Key Features & Performance
- ✓Annotation libraries: KotlinX Serialization, Jackson, Moshi, or Gson (`@SerializedName`).
- ✓Generates nested data classes recursively for deep JSON hierarchies.
- ✓Smart type inference: `Long`, `Double`, `String`, `Boolean`, and nullable `?` types.
- ✓100% Client-Side memory execution.
- ✓1-Click Copy Kotlin code.
Key Terminology & Definitions
Kotlin Data Class
A concise Kotlin class created primarily to hold data, automatically providing `equals()`, `hashCode()`, `toString()`, and `copy()` methods.
KotlinX Serialization
The official Kotlin multiplatform serialization library compiling serializers without reflection overhead.