First of all I’m really grateful for the video and I have learn a lot from it!
While I was following the tutorial, I stuck in the ‘create sample products’ section.
It seems that I successfully connected with mongoDB but the information I fetched was nothing but an empty string.
The console shows:  no properties.
I wanted to upload the screenshot but I have no permission.
I’m sure there is nothing wrong with the code.
Hopefully you can help me find out where the bug is.