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Kotlinx Serialization TypeScript Generator

Kotlinx Serialization TypeScript Generator (or KxsTsGen for short) creates TypeScript interfaces from Kotlinx Serialization classes, allowing for quick and easy communication via JSON with a Kotlin-first approach.

import kotlinx.serialization.*
import dev.adamko.kxstsgen.*

@Serializable
class MyClass(
  val aString: String,
  var anInt: Int,
  val aDouble: Double,
  val bool: Boolean,
  private val privateMember: String,
)

fun main() {
  val tsGenerator = KxsTsGenerator()
  println(tsGenerator.generate(MyClass.serializer()))
}

Generated TypeScript interface:

export interface MyClass {
  aString: string;
  anInt: number;
  aDouble: number;
  bool: boolean;
  privateMember: string;
}

Only Kotlinx Serialization SerialDescriptors are used to generate TypeScript. They are flexible and comprehensive enough to allow for accurate TypeScript code, without any surprises.

See the docs for working examples.

Status

	Status	Notes
Kotlin multiplatform	❓	The codebase is multiplatform, but only JVM has been tested
@SerialName	✅/⚠	The serial name is directly converted and might produce invalid TypeScript
Basic classes	✅ example
Nullable and default-value properties	✅ example
Value classes	✅ example
Enums	✅ example
Lists	✅ example
Maps	✅/⚠ example	Maps with complex keys are converted to an ES6 Map, see documentation
Polymorphism - Sealed classes	✅/⚠ example	Nested sealed classes are ignored, see documentation
Polymorphism - Open classes	❌ example	Not implemented. Converted to type MyClass = any
@JsonClassDiscriminator	❌	Not implemented
JSON Content polymorphism	❌ example	Not implemented. Converted to type MyClass = any
Edge cases - circular dependencies	✅ example