Run npm start to run the prod version. Look in package.json for more npm scripts.

If you are running backend server and the hmr server. Please turn off cross scripting security for development. You can do that by this command:
"C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" --user-data-dir="C:/Chrome dev session2" --disable-web-security

Run npm run build to build the prod client. The build artifacts will be stored in the server/client_dist/ directory.