This package surfaces the Screeps client in the browser of your choice for users who have purchased the official Screeps app on Steam.

I personally run into a lot of issues with the official client, especially on macOS. The official client is simply an NW.js wrapper around an AngularJS app. The version of NW.js included with the client is fairly ancient; at the time of this writing it was based on Chrome 76 [July 2019] -- a two year old version. I made this package because I was experiencing frequent crashes in the official client, and I desired a native experience on my Apple M1-based computer.

This client just serves up the Screeps client files which are already sitting in your Steam folder. It also adds some basic endpoints for authentication via Steam OpenID. For all intents and purposes it is the official client but running in the browser of your choice.

npm install -g screeps-steamless-client
npx screeps-steamless-client

You must visit a specially crafted local URL in order to specify the server you want to connect to. In order to connect to the official Screeps World server you would visit: http://localhost:8080/(https://screeps.com)/.

In order to visit a local server running on port 21025 you would visit: http://localhost:8080/(http://localhost:21025)/. Note that Steam OpenId support is required on your local server which can be enabled with screepsmod-auth. For xxscreeps servers this should be enabled by default.

This client makes use of "guest mode" which is enabled by default in xxscreeps. This will provide you with a read-only view of the server when you are not signed in. The client will show you as signed in as user Guest and your icon will belong to the Invader user. To sign in with your Steam account you need to select "Sign Out" first, which will sign you out of Guest and bring you to the real login page. Click the Steam icon towards the bottom to sign-in with your Steam account and play the game as normal.