Go to the Server folder that we created earlier in the chapter. It should have just one file, app.js.
To run the Flask server, run the following command using the Terminal:
$: python3 app.py
Once you run that, you will see that the server is running again on localhost but on a different port (by default, it is 5000). If you see no errors, it means that the server is running fine.
We have everything running now. You can go to the web page and start playing around with the page that you just built.