Nginx config to forward traffic to a port.

nginx.conf

user                    www-data;
worker_processes        5;
worker_rlimit_nofile    8192;
 
events {
    worker_connections  4096;
}

http {
    server {
        listen 80;
        
        location /nodejs {
            proxy_pass http://127.0.0.1:3000;
        }
        location / {
            root /var/www/;
            index index.html;
        }
    }
}