To add to this, are you running docker-compose up with a -d flag?

When I got into Dockers, I got confused when the docker command would not complete (i.e. get back to bash shell after completing the command). In docker, you need to specify the “-d” flag to run it in background (i.e. separate daemon)

One more point, when @CumBroth says

You’d need to change that to 3000:3000.

It should be

    ports:
      - "3000:3000"