Free JSON to Kotlin Data Class Generator Online
Convert JSON data to Kotlin data classes automatically. Supports nested objects, arrays, and nullable types. Download .kt files instantly for free.
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What is JSON to Kotlin?
JSON to Kotlin is a free online tool that generates Kotlin data class definitions from JSON data. It creates idiomatic Kotlin code with proper types, nullable fields, and optional kotlinx.serialization annotations. Perfect for Android and Kotlin developers working with REST APIs or JSON data.
How to Use JSON to Kotlin
- Paste your JSON data into the input area
- Set the root data class name
- Toggle @Serializable annotation if using kotlinx.serialization
- Click 'Convert' and copy or download the .kt file
JSON to Kotlin Features
- Generates idiomatic Kotlin data classes
- Optional kotlinx.serialization @Serializable annotation
- Nested objects generate separate data classes
- Arrays map to List<T> with correct types
- Nullable types (T?) for null JSON values
JSON to Kotlin FAQ
What is a Kotlin data class?
A data class is a Kotlin class optimized for holding data. It auto-generates equals(), hashCode(), toString(), and copy() methods.
Do I need kotlinx.serialization?
Only if you use the @Serializable annotation. Otherwise, the generated classes work with Gson, Moshi, or any other JSON library.
Is my data secure?
Yes! All conversion happens in your browser. Your data is never sent to any server.