For example, this is how I set data:
var usersRef = firebase.database().ref("userlist/"); usersRef.child(nickname).set({ userid: id, email: email, }); What should I do if I later on want to get email given the nickname? Why can't I do something like this:
const email =usersRef.child(nickname).child(email); To get the email you need to do the following:
var ref = firebase.database().ref("userlist").child(nickname); ref.on("value", function(snapshot) { let emails=snapshot.val().email; console.log(email); }); }); You need to reference the location and then attach a listener to it to be able to retrieve the child values like email and id
The email constant that you set does not point to an email rather it points to a firebase database reference.
To get the value of email, you listen to the reference and the value is equal to what is returned.
ref.child(nickname).child("email").on("value", function(snapshot) { const email = snapshot.val(); }); 