Switch between localhost and container node application in "dockered" NGINX

app.conf

upstream node-app {
    # Enable this to use theserver running inside docker
    # server node-app:3000;

    # Enable this to use the (development) server running on your localhost
    server host.docker.internal:3000;
}

server {
    location / {
        proxy_pass http://node-app;
    }
}