Does it generate idiomatic Kotlin?

Yes! The generator produces data classes with val properties (immutable), List for arrays, and proper Kotlin type names (Int, String, Boolean, Double).

Can I use this with Kotlin Serialization?

The generated data classes work with both Kotlin Serialization (@Serializable) and Gson/Moshi by adding the appropriate annotations.

How are nested objects handled?

Each nested JSON object becomes its own data class with proper type references. The output is ready to paste into your Kotlin project.

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JSON to Kotlin Data Class Generator

Generate Kotlin data classes from JSON

100% client-side — your data never leaves your browser

Ctrl+Enter to process

Input

OutputKotlin

Output will appear here...

Privacy guarantee:Unlike jsonformatter.org which leaked 80,000+ files in November 2025, JSONShield processes everything in your browser. Zero network requests with your data. Open your browser DevTools (Network tab) to verify — you'll see zero outbound requests containing your JSON.