npm install express

npm install express-generator -g



express helloworld



cd helloworld

npm install



DEBUG=helloworld:* npm start


127.0.0.1:3000


-----------------

firewall-cmd --add-port=5432/tcp --zone=public --permanent

firewall-cmd --reload

https://developer.mozilla.org/ja/docs/Learn/Server-side/Express_Nodejs/development_environment