Use NGINX as proxy server for Node ExpressJS application.

my-app.tld.conf

server {
  listen 80 default_server;
  listen [::]:80 default_server;

  server_name my-app.tld www.my-app.tld;

  # Serve assets directly from nginx
  location ~ ^/(scripts/|images/|img/|js/|css/|stylesheets/|media/|robots.txt|humans.txt|favicon.ico) {
    root /path/to/my-app/public/;
    access_log off;
    expires 24h;
  }
  
  # Serve node_modules static files directly from nginx
  location ~ ^/(node_modules/) {
    root /path/to/my-app/node_modules/;
    access_log off;
    expires 7d;
  }  

  location / {
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_set_header X-NginX-Proxy true;
    proxy_pass http://127.0.0.1:3000/;
    proxy_redirect off;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    proxy_set_header X-Forwarded-Proto $scheme;
  }
}