JSON to Kotlin Converter
Generate Kotlin data classes from JSON
JSON to Kotlin Converter is a free online tool from BrowserUtils that generate kotlin data classes from json. It runs entirely in your browser — your data never leaves your device. No account required.
How to use JSON to Kotlin Converter
- 1 Paste or type your input into the editor above.
- 2 The tool processes your data instantly — right in your browser, with nothing sent to a server.
- 3 Copy the result with one click or continue editing your input.
About JSON to Kotlin Converter
Free online JSON to Kotlin converter. Automatically generate Kotlin data classes from JSON data. This tool runs entirely in your browser — your data is never sent to a server. Just paste your input, get instant results, and copy with one click. No sign-up or installation required.
JSON to Kotlin Converter specs
- Runtime
- 100% client-side (browser)
- Cost
- Free — no account, no rate limits, no usage caps
- Browser support
- Chrome 90+, Firefox 88+, Safari 14+, Edge 90+
- Part of
- 299 developer tools on BrowserUtils (100% client-side)
Questions
How do I generate Kotlin data classes from JSON?
Paste your JSON into the input field and the tool will produce Kotlin data classes with val properties. Nested objects become separate data classes with proper type references.
What Kotlin types does the converter produce?
The converter maps JSON strings to String, integers to Int, decimals to Double, booleans to Boolean, and arrays to List<T>. Null values are typed as Any?.
Can I use the generated Kotlin data classes with Moshi or Gson?
Yes, the data classes work with Moshi, Gson, and kotlinx.serialization. You may need to add the appropriate annotations depending on which library your project uses.
Does the JSON to Kotlin converter work offline?
Once the page is loaded, all JSON parsing and class generation run in your browser with no server calls, so you can use it without an internet connection.
Is it safe to paste production JSON into the Kotlin converter?
Yes, no data is sent to any server. All processing happens locally in your browser, so production API responses and sensitive data remain private.
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