Android apps and JVM services regularly consume JSON before backend teams finalize contracts. Generating Kotlin data classes from sample payloads speeds up model creation and reduces the amount of manual property mapping you need to do.
What Is the JSON to Kotlin?
JSON to Kotlin is one of the tools in WebdevToolbox’s JSON Tools category. Generate Kotlin data classes with Gson annotations from JSON data. It runs entirely in your browser — no server uploads, no accounts, no waiting.
How to Use It
- Open the tool at /tools/json-to-kotlin.
- Paste a sample JSON payload into the input field.
- Review the generated Kotlin data classes with Gson annotations as they update in real time.
- Use the Copy button to copy the code into your Android or JVM project.
Key Features
- 100% client-side — all processing happens in your browser. Nothing is sent to a server.
- Real-time code generation — Kotlin models refresh as soon as the input JSON changes.
- Data class output — generate Kotlin data classes instead of manually defining every property and nested object.
- Gson annotation support — field mappings are prepared for common Gson-based serialization workflows.
- One-click copy — copy the generated classes to your clipboard with a single button press.
When to Use the JSON to Kotlin
- Android networking — turn a REST response into starter models for Retrofit, Gson, or repository-layer parsing.
- JVM service integration — bootstrap DTOs when a Kotlin backend consumes an external JSON API.
- Prototype modeling — use a captured payload from logs or QA to create data classes before finalizing the schema.
Try It Now
Open JSON to Kotlin directly from anywhere on the site using ⌘K and typing the tool name. No login required — everything runs offline-capable in your browser.
Part of the JSON Tools collection on WebdevToolbox — free, browser-based developer tools with no login required.