Calculator
What the JSON to Kotlin does
JSON to Kotlin: converts Status and Kotlin from JSON and Root data class name. Example: root data class name Root gives status 3 data classes generated.
From JSON and Root data class name, this tool derives Status and Kotlin. Each change is reflected immediately, which suits quick what-if comparisons.
Most of these tasks are one-liners in a terminal, but not when you are away from one. The JSON to Kotlin exists to take that particular chore off your hands.
Payloads stay in the tab, so you can safely paste production data without it reaching a third party.
The method, a field-by-field reference and a worked example built from the defaults are all on this page.
What do the JSON to Kotlin fields mean?
The JSON to Kotlin uses 2 inputs. Starting values are already in place, which saves the usual blank-form hesitation about what a field wants.
| Field | What to enter | Default |
|---|---|---|
| JSON | paste or type any amount of text | { "id": 42, "name": "Ada", "is_active": true, "score": 9.5, "tags": ["admin", "dev"], "address": { "city": "London", "zip": "N1" }, "orders": [ { "id": 1, "total": 19.99 }, { "id": 2, "total": 5, "note": "gift" } ] } |
| Root data class name | required | Root |
How does the JSON to Kotlin work?
Each output is derived from the inputs above in a single pass; there is no hidden state carried between runs, so the same inputs always give the same conversion.
Range checks come first, so the formula only ever sees values it can handle.
Worked example
These are the values the JSON to Kotlin loads by default, and the result it produces from them. The figures are the tool’s live defaults and its live output, so you can reproduce them exactly.
| JSON | { "id": 42, "name": "Ada", "is_active": true, "sc… |
|---|---|
| Root data class name | Root |
| Status | 3 data classes generated |
|---|---|
| Kotlin | import kotlinx.serialization.SerialName import kotlinx.serialization.Serializable @Serializable data class Root(… |
How to use it
- Paste your content into JSON.
- Type Root data class name.
- Live output means you can search for a target value by nudging an input up and down.
- The panel reports Status and Kotlin.
- The link encodes your inputs, so saving it is enough to reproduce the result later.
What this tool does not do
- Output follows the common convention for this format; a specific toolchain may have its own house style.
- Processing happens in your browser, so extremely large inputs are bounded by available memory.
- Results are informational: check anything consequential against a second source.
Frequently asked questions
The form asks for JSON and Root data class name. Defaults are loaded for all of them, which makes it easy to isolate the effect of a single variable.
With the values loaded when the page opens, status comes out as 3 data classes generated. That number tracks the inputs, so a small edit shows its sensitivity immediately.
It is not stored or transmitted. The calculation happens locally and leaves no trace with us.
Free, and there is no upsell. The whole tool is the free version.
Full double precision is used throughout; only the displayed figure is shortened.