Developing Standalone Microservices with the Beam CLI

Beamable offers a rich microservice development workflow using the Beam CLI and Dotnet. Microservices deploy to the Beamable Cloud, and offer a secure way to handle server-side authoritative logic for your games.


Before you can develop a Beamable Standalone Microservice, you need to complete the Getting-Started Guide. That means having Dotnet 8 installed, and getting the Beam CLI.

You can confirm you have everything installed checking the versions of the tools.

dotnet --version
beam version # beam --version also works.

Quick Start

Standalone Microservices require a .beamable workspace, so you either need to create one with beam init, or use an existing one.

beam init MyProject
cd MyProject

Once you have a .beamble workspace, you can create a new Standalone Microservice using the project new command.

# run this inside your .beamable workspace
beam project new service HelloWorld

A new file, BeamableServices.sln has been created in /MyProject. Open it in your IDE of choice (Visual Studio Code, Rider, or Visual Studio).

Project Structure

Congratulations, you have a local Beamable Standalone Microservice! To run it, you can use the IDE tooling to start the HelloWorld project, or you can use the project run command. If you're familiar with dotnet, you can also use the normal dotnet run command as well.

However you decide to run the project, you should see a stream of logs similar to the snippet below,

13:25:33.077 [DBUG] Service provider initialized
13:25:33.307 [DBUG] Event provider initialized
13:25:33.308 [INFO] Service ready for traffic.baseVersion=2.0.0-PREVIEW.RC2 executionVersion= portalURL=https://portal.beamable.com/cid/games/DE_1751365810229268/realms/pid/microservices/HelloWorld/docs?refresh_token=redacted&prefix=redacted

The service is running! You can send requests to the service over HTTPS. To verify, you can open the local Open API documentation by using the project open-swagger command.

beam project open-swagger

Your local web browser should open to the Beamable Portal, showing the local Open API documentation,
local swagger docs

Click on the last green button that says, "POST /Add", and then select the "Try It Out" button. In the Request Body, enter some sample JSON,

  "a": 2,
  "b": 3

And then click the Execute button! In your Standalone Microservice project, you should see some logs appear indicating the service was invoked.

13:30:18.945 [DBUG] Handling Add

The Add function is defined in the HelloWorld.cs file.

using Beamable.Server;  
namespace Beamable.HelloWorld  
    public class HelloWorld : Microservice  
       public int Add(int a, int b)  
	       return a + b;  

You can write new functions and tag them with [ClientCallable] to make them accessible on the Open API page. And now you know the basics of working with Beamable Standalone Microservices!

Project Structure

Each file in the Standalone Microservice has a valuable function that is important to understand.

MyProject/services/.gitignorea version control file that will ignore build and intermediate folders from your git based source control
MyProject/services/DockerfileWhen the Standalone Microservice is deployed, it will be containerized using Docker. You can modify the Dockerfile to extend the capabilities of the service. See the Deployment Section for more details
MyProject/services/HelloWorld.csThis file is the main .cs file that has your server functionality
MyProject/services/ProgramcsThis file is the entry point of the dotnet application. It bootstraps the server and starts it. You may edit it, but make sure not to remove the section that enables the service.
MyProject/services/HelloWorld.csprojThis file is the dotnet project file for your service. You can modify the .csproj file to customize your service. See the Microservice Configuration Section section for more details
MyProject/BeamableServices.slnThis file is the dotnet solution file, and organizes your services. If you add additional services or storage databases, they will be tracked through the .sln file.

Next Steps

There are many topics to continue learning about Beamable Standalone Microservices,