I have two apps, api and frontend, I have uploaded in the same droplet, the frontend app is running on the port 3000 and the api is running on the 8000, my nginx config is:

{.....
    # root /var/www/html;
    root /home/testing-client/dist;

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

    server_name _;

    location / {
        proxy_pass http://localhost:3000;
         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;

    # First attempt to serve request as file, then
        # as directory, then fall back to displaying a 404.
        #try_files $uri $uri/ =404;
    }
....

but in my frontend app throw error to connect with api in localhost:8000