This is a Kotlin Multiplatform project targeting Android, iOS, Web, Desktop (JVM), Server.

• /composeApp is for code that will be shared across your Compose Multiplatform applications. It contains several subfolders:

  • commonMain is for code that’s common for all targets.
  • Other folders are for Kotlin code that will be compiled for only the platform indicated in the folder name. For example, if you want to use Apple’s CoreCrypto for the iOS part of your Kotlin app, the iosMain folder would be the right place for such calls. Similarly, if you want to edit the Desktop (JVM) specific part, the jvmMain folder is the appropriate location.

• /iosApp contains iOS applications. Even if you’re sharing your UI with Compose Multiplatform, you need this entry point for your iOS app. This is also where you should add SwiftUI code for your project.

• /server is for the Ktor server application.

• /shared is for the code that will be shared between all targets in the project. The most important subfolder is commonMain. If preferred, you can add code to the platform-specific folders here too.

Build and Run Android Application

To build and run the development version of the Android app, use the run configuration from the run widget in your IDE’s toolbar or build it directly from the terminal:

• on macOS/Linux

  ./gradlew :composeApp:assembleDebug
  

• on Windows

  .\gradlew.bat :composeApp:assembleDebug
  

Build and Run Desktop (JVM) Application

To build and run the development version of the desktop app, use the run configuration from the run widget in your IDE’s toolbar or run it directly from the terminal:

• on macOS/Linux

  ./gradlew :composeApp:run
  

• on Windows

  .\gradlew.bat :composeApp:run
  

Build and Run Server

To build and run the development version of the server, use the run configuration from the run widget in your IDE’s toolbar or run it directly from the terminal:

• on macOS/Linux

  ./gradlew :server:run
  

• on Windows

  .\gradlew.bat :server:run
  

Build and Run Web Application

To build and run the development version of the web app, use the run configuration from the run widget in your IDE's toolbar or run it directly from the terminal:

• for the Wasm target (faster, modern browsers):
  • on macOS/Linux

    ./gradlew :composeApp:wasmJsBrowserDevelopmentRun
    

  • on Windows

    .\gradlew.bat :composeApp:wasmJsBrowserDevelopmentRun
    

Build and Run iOS Application

To build and run the development version of the iOS app, use the run configuration from the run widget in your IDE’s toolbar or open the /iosApp directory in Xcode and run it from there.

Local development

The server requires Postgres. A docker-compose.yml at the repo root ships a local Postgres instance whose credentials match application.conf defaults (recipe/recipe/recipe).

Boot the database and server:

docker compose up -d postgres
./gradlew :server:run

Verify the server is up:

curl http://localhost:8080/health
# expected: {"status":"ok"}

Environment overrides (optional — set any of these to override application.conf defaults):

• DATABASE_URL — JDBC URL (default jdbc:postgresql://localhost:5432/recipe)
• DATABASE_USER — DB user (default recipe)
• DATABASE_PASSWORD — DB password (default recipe)
• PORT — Ktor port (default 8080)

Before committing, format all Kotlin + Gradle + Markdown files:

./gradlew spotlessApply

The full check (Spotless + all tests across all targets):

./gradlew check

Reset the local database (destroys the recipe-pgdata volume):

docker compose down -v

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Learn more about Kotlin Multiplatform, Compose Multiplatform, Kotlin/Wasm…

We would appreciate your feedback on Compose/Web and Kotlin/Wasm in the public Slack channel #compose-web. If you face any issues, please report them on YouTrack.