//every user must have an email firebase.database().ref(`users/${userId}/email`).once("value", snapshot => { if (snapshot.exists()){ console.log("exists!"); const email = snapshot.val(); } });
ref.child("users").orderByChild("ID").equalTo("U1EL5623").once("value",snapshot => { if (snapshot.exists()){ const userData = snapshot.val(); console.log("exists!", userData); } });