Is there any way to get Firebase Auth User UID?

Question

I am looking to fetch Auth User(s) UID from Firebase via NodeJS or Javascript API. I have attached screenshot for it so that you will have idea what I am looking for.

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Answer 1

if a user is logged in then the console.log will print out:

if (firebase.auth().currentUser !== null) 
        console.log("user id: " + firebase.auth().currentUser.uid);