node.js api with static homepage for nginx users that visit you site via html will go to static html files. users who use api calls (yoursite.com/v1/ ) will redirect to the node app

gistfile1.txt

server {
  listen 0.0.0.0:80;
  listen [::]:80 default_server ipv6only=on;
  server_name localhost;
  access_log /var/log/nginx/app.log;
  root /usr/share/nginx/html/app-static;
  index index.html;

  location /v1 {
    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_pass http://node;
  }
}

upstream node {
   server 127.0.0.1:3000;
}