How to debug app with VS Code?

Hello Community!

I have a problem. I want to connect my IDE with my running monday app on monday.com

I am trying to write my very first monday app. As an inspiration I took example app for doc actions “Capitalizer”.
What I want to do is to connect my VS Code with my test app which is running in iframe. Exact same as Dipro’s Quickstart guide

But I don’t know how to configure my IDE to do so.
I was searching for solution, but I didn’t find. Or I missed topic.

Thanks in advance for a help.

Regards,
Paweł