Learn KOTLIN-JS-WASM with Real Code Examples

Install JDK and Kotlin toolchain

Install Gradle

Enable Kotlin Multiplatform in build.gradle.kts

Choose JS (IR) or Wasm target

Run `./gradlew build` or `jsBrowserDevelopmentRun`

Install JDK

Install Kotlin + Gradle

Enable JS/Wasm target

Run dev server

Open browser for hot reload

build.gradle.kts - Kotlin target settings

settings.gradle.kts - project structure

index.html - web entrypoint

webpack/esbuild configs (auto)

src/* - Kotlin source sets

./gradlew jsBrowserDevelopmentRun

./gradlew wasmBrowserRun

./gradlew build

./gradlew wasmJs

./gradlew jsNodeRun

kotlinx.serialization for multilingual content

Compose for Web i18n patterns

Interop with JS i18n libraries

Shared translations across JVM/JS/Wasm

Unicode fully supported

Compose for Web semantic elements

ARIA attributes via Kotlin wrappers

Keyboard events mapped to Kotlin

Screen-reader friendly layouts

JS accessibility APIs exposed

Compose for Web uses CSS declarative DSL

KVision uses Bootstrap and React

Direct DOM CSS manipulation possible

Kotlin wrappers for JS style APIs

Web components supported

Kotlin variables stored in Wasm-GC heap

Interop passes JS objects to Kotlin wrappers

Compose for Web manages UI state

Serialization via kotlinx.serialization

WASI state managed via runtime (future)

JSON via kotlinx.serialization

Typed arrays via JS interop

Binary formats for Wasm performance

Shared DTOs across platforms

Browser storage via Kotlin wrappers