How to set up a top level domain pointing to an express server and subdomain pointing to a separate react application

I’ve been searching for the following structure but I couldnt find anything helpful.

I have 2 applications on my droplet. First is an express server. Second is a React app.

I want the express server to be accessed via www.DOMAIN.com. And I want the react app to be accessed via console.DOMAIN.com.

So far my express server is being accessed properly. I just dont know how to set up the subdomain. My droplet has this nginx config.

	listen 80 default_server;
	listen [::]:80 default_server;

	# SSL configuration
	#
	# listen 443 ssl default_server;
	# listen [::]:443 ssl default_server;
	#
	# Note: You should disable gzip for SSL traffic.
	# See: https://bugs.debian.org/773332
	#
	# Read up on ssl_ciphers to ensure a secure configuration.
	# See: https://bugs.debian.org/765782
	#
	# Self signed certs generated by the ssl-cert package
	# Don't use them in a production server!
	#
	# include snippets/snakeoil.conf;

	root /var/www/html;

	# Add index.php to the list if you are using PHP
	index index.html index.htm index.nginx-debian.html;

	server_name DOMAIN.com www.domain.com;

	location / {
		# First attempt to serve request as file, then
		# as directory, then fall back to displaying a 404.
		 proxy_pass http://localhost:8080; #whatever port your app runs on
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
	}