Firebase getToken() TypeError: Cannot read property

Question

I\'m trying to get the token of my currently signed in user of my website. However, javascript cannot get the value for me. I think there are 2 problems here:

Answer 1

Here is a sample on how to get the id token using NodeJS

var firebase = require('firebase')
firebase.initializeApp({
    apiKey:*********
    databaseURL:*********
})

var customToken = *********    
firebase.auth().signInWithCustomToken(customToken).catch(function(error) {
    var errorMessage = error.message
    console.log(errorMessage)
})

firebase.auth().onAuthStateChanged(function(user) {
    if (user) {
        firebase.auth().currentUser.getToken().then(data => console.log(data))
    } else {
        console.log('onAuthStateChanged else')
    }
})