JSON to Kotlin Data Class

Paste your JSON into the box above and the Kotlin data class appears instantly below — nothing to press, nothing to upload. It runs entirely in your browser, so you can copy the generated code or download it as a file. If the input has a syntax error, a clear message tells you what to fix.

Yes. It is completely free with no signup or limits, and it is private because the whole conversion runs locally in your browser — your data and code are never sent to a server. That makes it safe for proprietary schemas and payloads, and it works offline once the page has loaded.

You get Kotlin data class generated from your JSON: Kotlin data classes give you a typed model for the data on Android/JVM. It saves you writing the boilerplate by hand and keeps the generated types in sync with your real data.

Yes. Nested objects become nested types and arrays become typed lists automatically, with sensible names inferred from your JSON. For the cleanest result, give a representative sample that includes every field you expect.

There is no fixed limit because nothing is uploaded — the only constraint is your device's memory, so even large inputs convert quickly. The generator engine loads on first use and is cached afterwards, so repeat runs are instant.

Yes. It runs in any modern browser on Windows, Mac, Linux, iPhone and Android with nothing to install, and works offline once loaded. Copy or download the generated code on any device.