How to use in a docker container?

[hiagodotme]

I have a container that uses the default nodejs image. I share the volume of the project and internally in the container I execute the project.

I have a container with the dd-agent, but I can't understand how the dd-agent container would connect with the nodejs container to get the data.

Is there a possibility to configure an api key directly in the library so as not to have the datadog agent installed?