How to set a simple reverse proxy with nginx

Add a new server block

sudo vim /etc/nginx/sites-enabled/yourdomain.com

Add the following content

server {
    listen 80;
    listen [::]:80
    server_name yourdomain.com; # or _ if you want to listen to all domains
    location / {
        proxy_pass http://localhost:3000;
        proxy_set_header X-Real-IP $remote_addr;
		proxy_set_header Host $http_host;
    }
}