Introduction: Ready to go template for multiplatform Kotlin
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Template that will give you a ready-to-go project including:

  • Backend project with Ktor at backend/
  • Frontend project with KotlinJS and React Kotlin at web/
  • Android App project with KotlinJVM at android/
  • iOS App project with KotlinNative at ios/
  • Shared network, domain and presentation at common/

Looking for a project with just Android and iOS? It's here: https://github.com/wiyarmir/kotlin-multiplatform-mobile-template

Looking for a project with just Backend and Web? It's here: https://github.com/wiyarmir/kotlin-multiplatform-frontend-template

Building and running the project


There is a Gradle task that will produce a JAR ready to go.

$ ./gradlew stage

The output is in backend/build/libs/backend-release.jar.

The following environment variables are recognised:

Name Value
PORT Port where the server will run and listen to incoming connections
ENVIRONMENT Can be either production or development. If absent, will assume development.

You can run the backend development server executing:

$ ./gradlew backend:run

This will start serving the app in port 9090 by default.


If you want to run the frontend development server, you can execute:

$ ./gradlew web:run

This will start the webpack development server in port 8080, and proxy all calls to files it doesn't know to port 9090.

If you want the frontend development server to connect to the development backend, you'll need to pass the flag -Pdebug.

$ ./gradlew web:run -Pdebug

Warning: The webpack development server will keep running until you execute ./gradlew web:stop.

Hot reloading

In backend, Ktor supports hot reloading, but since the task serving the app is kept alive, you need to execute in a separate console:

$ ./gradlew backend:classes -t

This will recompilate classes on file changes, and Ktor will detect it and reload them on the next request it serves.

For the frontend, it's enough to execute the original run task with -t flag.

$ ./gradlew web:run -t


Open the root project in Android Studio or IntelliJ, and it will recognise the Android App configuration after a successful Gradle sync. You can use that configuration to run, debug and profile the app.


Open the workspace located at ios/KotlinMultiplatformTemplate.xcworkspace in XCode. The Podfile includes an entry to the common code with an extra user script for it to be recompiled as a build step.



There is a Procfile that will JustWork™️ on Heroku or Herokuish environments (think Dokku).


By default, the web bundle and a default index.html are included in the backend jar and served at /.


If you would like to contribute code to this repository you can do so through GitHub by creating a new branch in the repository and sending a pull request or opening an issue. Please, remember that there are some requirements you have to pass before accepting your contribution:

  • Write clean code and test it.
  • The code written will have to match the product owner requirements.
  • Follow the repository code style.
  • Write good commit messages.
  • Do not send pull requests without checking if the project build is OK in the CI environment.
  • Review if your changes affects the repository documentation and update it.
  • Describe the PR content and don't hesitate to add comments to explain us why you've added or changed something.


Copyright 2019 Kotlin Multiplatform Template

Licensed under the Apache License, Version 2.0 (the "License"); you may 
not use this file except in compliance with the License. You may obtain a 
copy of the License at


Unless required by applicable law or agreed to in writing, software 
distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 
WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 
License for the specific language governing permissions and limitations 
under the License.
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