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⚡ Advanced Developer Toolbox Transform, Mock, Security & API Client
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Class / Model to JSON: Keys:
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Paste JSON Payload

Paste raw JSON, drag & drop a .json file, or choose a workflow below:

○ Waiting for JSON | Lines: 0 · Chars: 0 · Size: 0 B · Depth: 0
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Generated Output

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Ready to generate
Paste JSON in the input panel and hit Beautify or Generate to see results here.

JSON to Kotlin — Generate Data Classes for Android & Backend

Kotlin data class is the standard way to model API data in Android and Ktor/Spring backends. Paste your JSON here and get back a complete Kotlin data class with val fields, nullable ? types where needed, and nested classes extracted cleanly.

The output is compatible with Gson, Moshi, and kotlinx.serialization without any extra annotations. Nested JSON arrays become List<T>. The generated code compiles as-is in Android Studio or IntelliJ IDEA.

❓ Frequently Asked Questions

Is processing on json-to-kotlin.html private and secure?

Yes. All JSON processing, parsing, and code generation happen 100% locally inside your browser sandbox. No server roundtrips or third-party tracking occur.

Is JSON Workbench free to use for JSON to Kotlin Data Class Generator?

Yes, JSON Workbench is completely free for commercial and personal developer use with zero registration or payload limits.

Can I copy or download the generated output?

Yes! You can instantly copy the output code to your clipboard or download it as a structured file.

🧰 Complementary Developer Tools

📝 JSON Formatter & Beautifier ⚖️ Visual JSON Diff ⚡ Class to JSON Converter ✨ JSON Mock Data Generator