JSON to Kotlin — Generate Kotlin Data Classes from JSON Online

What is JSON to Kotlin?

Generate Kotlin data classes from JSON. Convert JSON to Kotlin for Android or backend.

Convert JSON to Kotlin data class definitions. Use for Android, Ktor, or any Kotlin project. Runs in your browser. Part of formatterjson.org.

How to Use JSON to Kotlin

1. Paste or type your input into the editor on the left panel.
2. Results update automatically while you type. You can also press Ctrl+Enter to force a refresh.
3. View the result in the output panel on the right with full syntax highlighting.
4. Use Copy or Download to export the result.
5. Drag and drop .json or .txt files directly into the editor.
6. Toggle Tree View for an interactive, collapsible view of the JSON structure.

Example

{"name":"John","age":30}

data class Root(
    val name: String,
    val age: Double
)

Common Use Cases

• Android
• Ktor
• Backend Kotlin

Common Errors

• Invalid JSON

Why Use Our JSON to Kotlin?

• 100% client-side — your data never leaves your browser. No server processing, no data collection.
• No sign-up required — start using the tool instantly with no registration or installation.
• Keyboard shortcuts — press Ctrl+Enter to run, ? for shortcuts list, Ctrl+B to toggle sidebar.
• Persistent state — your input is automatically saved across sessions using local storage.
• IDE-style interface — Monaco Editor (the engine behind VS Code) with syntax highlighting and error detection.
• Multi-format conversion — convert between JSON, XML, CSV, and YAML without switching tools.

Frequently Asked Questions

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