Javascript is one of the supported targets for a Kotlin Multiplatform project. One can add Kotlin/JS target to an existing Kotlin Multiplatform Mobile library to output a JS library code. There are various aspects to consider for the Kotlin/JS integration, • Supporting JavaScript or Typescript • Gradle configuration • Exposing Kotlin code to JavaScript and writing JS-specific code • JS Library size and impact of third-party libraries • Architectural decisions around shared code across platforms, networking, storage, serialization, etc. This talk discusses how to deal with the issues mentioned above and more.