Secure an application meteor and its base mongodb

I arrive on a delicate point of development of my application meteor and on the net, I find everything and its opposite !!
I would like to secure my meteor application and have an encrypted Mongodb database, only for some fields or for the entire database.
I saw that the package ‘mylar’ existed, but I find very little documentation of use on this subject.
What do you think ? Do you have feedback on this package?
Is there anything else?
In fact, how do you secure your meteor applications?

Thank you for your answers