How to load your main.js code in Parse Server?

Question

Node.js

For example, Back4app has a Cloud code function in the panel, you load your main.js in it and that's it. But I didn't find it in parse server. I also can’t find the directory where the parse server is installed, I thought I could find the ./cloud/ directory there and upload main.js into it.
The parse server itself was installed according to this article

PS. at the beginning I tried to install the parse server according to a different instruction and from the github, but when the application was launched via npm, a large number of warnings were issued, I tried fixing 2/13 and that's it