check if item is already registered in angular angularfire site 3astackoverflow com

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Giovanni
05 Oct 2020
1//every user must have an email
2firebase.database().ref(`users/${userId}/email`).once("value", snapshot => {
3   if (snapshot.exists()){
4      console.log("exists!");
5      const email = snapshot.val();
6   }
7});
8
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Walker
09 Jul 2017
1ref.child("users").orderByChild("ID").equalTo("U1EL5623").once("value",snapshot => {
2    if (snapshot.exists()){
3      const userData = snapshot.val();
4      console.log("exists!", userData);
5    }
6});
7
source
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