Example application showing how you can integrate Play with Scala.js.

Play Framework with Scala.js

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This is a simple example application showing how you can integrate a Play project with a Scala.js project.

The application contains three directories: * server Play application (server side) * client Scala.js application (client side) * shared Scala code that you want to share between the server and the client

Run the application

$ sbt
> run
$ open http://localhost:9000


The application uses the sbt-web-scalajs sbt plugin and the scalajs-scripts library.

  • Run your application like a regular Play app
    • compile triggers the Scala.js fastOptJS command
    • run triggers the Scala.js fastOptJS command on page refresh
    • ~compile, ~run, continuous compilation is also available
  • Compilation errors from the Scala.js projects are also displayed in the browser
  • Production archives (e.g. using stage, dist) contain the optimised javascript
  • Source maps
    • Open your browser dev tool to set breakpoints or to see the guilty line of code when an exception is thrown
    • Source Maps is disabled in production by default to prevent your users from seeing the source files. But it can easily be enabled in production too by setting emitSourceMaps in fullOptJS := true in the Scala.js projects.


The root project aggregates all the other projects by default. Use this root project, called play-with-scalajs-example, to clean all the projects at once.

$ sbt
> play-with-scalajs-example/clean

IDE integration


  1. $ sbt "eclipse with-source=true"
  2. Inside Eclipse, File/Import/General/Existing project..., choose the root folder. Uncheck the second and the last checkboxes to only import client, server and one shared, click Finish. Alt text


In IntelliJ, open Project wizard, select Import Project, choose the root folder and click OK. Select Import project from external model option, choose SBT project and click Next. Select additional import options and click Finish. Make sure you use the IntelliJ Scala Plugin v1.3.3 or higher. There are known issues with prior versions of the plugin.

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Example application showing how you can integrate Play with Scala.js. ...

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