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JSON to Kotlin Converter

Generate Kotlin data classes with serialization-ready property names from JSON.

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Kotlin data classes from samples

Android and Ktor projects lean on data classes for JSON parsing with kotlinx.serialization or Moshi. CalcForge turns example payloads into nested data classes reflecting actual keys—cutting boilerplate when integrating new endpoints.

Good fits

  • Android client models from backend sample responses
  • Ktor server DTOs for new routes
  • Shared multiplatform models before manual refinement
  • Learning kotlinx.serialization annotations from real shapes
JSON:
{"id":"u1","profile":{"displayName":"Ada"}}

Kotlin:
data class Root(
    val id: String,
    val profile: Profile
)
data class Profile(
    val displayName: String
)

Practical notes

  • Add `@SerialName` when JSON keys differ from Kotlin property names.
  • Nullable fields need `?` types—confirm against all observed responses.
  • Prefer immutable `val` properties; switch to `var` only if your stack requires it.

Frequently asked questions

Does output include serialization annotations?

Base data classes are generated; add kotlinx.serialization or Moshi adapters per your project setup.

How are optional fields represented?

Use nullable types or default values after reviewing all sample payloads for absent keys.

Can sealed hierarchies be generated?

Polymorphic JSON needs manual sealed types—start with generated classes and refactor variants yourself.

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