📖 What is this tool?
JSON to Kotlin Generator converts JSON objects into Kotlin data classes with val properties. Kotlin data classes are immutable by default and come with built-in toString, hashCode and copy methods — perfect for modern Android development.
💡 Example
Input
{"id":1,"name":"Alice","active":true}
Output
data class Root(
val id: Int,
val name: String,
val active: Boolean
)
🛠️ Common Use Cases
- Generate Kotlin data classes from API responses
- Scaffold Android data models from JSON
- Create Kotlin models for Retrofit/Gson
- Convert API samples to Kotlin
- Bootstrap Android projects with data classes
❓ Frequently Asked Questions
Why use Kotlin data classes for JSON? ▾
Kotlin data classes automatically provide equals(), hashCode(), toString() and copy() methods. Combined with Gson or Moshi annotations, they're ideal for Android JSON parsing with minimal boilerplate.
How do I parse JSON into a Kotlin data class? ▾
With Gson: val obj = Gson().fromJson(jsonString, Root::class.java). With Moshi: val adapter = Moshi.Builder().build().adapter(Root::class.java); val obj = adapter.fromJson(jsonString).
Should I use val or var in data classes? ▾
Prefer val (immutable) for data classes — it's safer and more idiomatic Kotlin. Use var only if you need to mutate properties after creation, which is rarely needed with proper architecture.
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