使用Node.js从对象获取数据

Question

I cant' access data from this Object "snapshots" and I don't know why :

[
{"action":"Afficher les détails ","cat":"Produits 1","image":"https://www.google.fr","lien":"https://www.google.fr","nom_intent":"1","reponse":"réponse 1","scat":"scat1"},
{"action":"Afficher les détails ","cat":"Produits 2","image":"https://www.google.fr","lien":"https://www.google.fr","nom_intent":"2","reponse":"réponse 2","scat":"scat2"},
{"action":"Afficher les détails ","cat":"Produits 3","image":"https://www.google.fr","lien":"https://www.google.fr","nom_intent":"3","reponse":"réponse 3","scat":"scat3"}
]

I get this object with this code :

function getFirebaseData(endpoint){
      return 
      firebase.database().ref('intent/'+endpoint).once("value", 
      function(snapshot){
            return snapshot.val();
      });
    }

Promise.all([
  getFirebaseData(entities.intent[0].value), 
  getFirebaseData(entities.intent[1].value), 
  getFirebaseData(entities.intent[2].value)
]).then(function(snapshots) {

});

and tried to access like this :

var action0 = snapshots[0].action;

but action0 is undefined

Answer 1

I found a trick to get this thing done !
I delcared an array : var firebaseData = [];
then I pushed in it all my values :

function getFirebaseData(endpoint){
          return firebase.database().ref('intent/'+endpoint).once("value", function(snapshot){
                firebaseData.push(snapshot.val());
          });
        }

And when the Promises are done, I access to this like that :

Promise.all([
    getFirebaseData(entities.intent[0].value), 
    getFirebaseData(entities.intent[1].value), 
    getFirebaseData(entities.intent[2].value)])
.then(function(snapshots) {
         var zero = firebaseData[0];
         var first = firebaseData[1];
});