get all data from firebase

Question

I just started to use firebase and I am new to the node.js environment im trying to send to get data from my database i got this using this code

 var country = sessionStorage.countryname;
 var ref = firebase.database().ref('posts/country/' + country + '/')

 ref.on('value', function(snapshot) {
     snapshot.forEach(function(keysSnapshot) {
         var keys = keysSnapshot.val();

         console.log('keys', keys);

     })
 }); 

I got all the data in keys but i dont know how to access it for example i want to get the age and first_name of each post ..this is what i get in console log

And this is my database

this is the json code

{
  "country" : {
    "Algeria" : {
      "844kh2QXDHgw7i4KBvULpCSO5KE2" : {
        "-L9MvZxV2bVjcuKGZx-2" : {

          "age" : "26",
          "first_name" : "jack",

          "gender" : "female",

          "home_adress" : "2222222222222222222222222222",

          "last_name" : "anonyo",

        },
        "-L9Mvpnyx1f9DDDygJcG" : {

          "age" : "29",

          "first_name" : "jazmine",

          "gender" : "female",

          "home_adress" : "2222222222222222222222222222",

          "last_name" : "anony",

        }
      },
      "QgWbVLqInga3JRNuzzlZBCzwkws2" : {
        "-L9ES58GkQcZGywqpIWY" : {

          "age" : "29",

          "first_name" : "jazmine",

          "gender" : "female",

          "home_adress" : "2222222222222222222222222222",

          "last_name" : "anony",

        }
      }
    },

    "england" : {
      "jdL079kwJUQSBzKE7aNIPInPEHX2" : {
        "-L925-sxlxsF5k9LZFHp" : {

           "age" : "29",

          "first_name" : "jessica",

          "gender" : "female",

          "home_adress" : "2222222222222222222222222222",

          "last_name" : "anony",
        }
      }
    }
  }
}

Answer 1

If you want to iterate all your users:

var objectKeys = Object.keys(keys);
for(x=0; x < objectKeys.length; x++){
     var currentKey = objectKeys[x];
     var userData = keys.currentKey; //Here you have all the data
     console.log(userData);
     //Now access the first_name property
     var firstName = userData.first_name;
}

I have no test it but it should work.

Answer 2

ok this is how i got it working var country = sessionStorage.countryname;

database.ref('posts/country/'+country).once('value').then(function(snapshot) {
  var country = snapshot.key ;

  snapshot.forEach(function(snapshot1) {
    console.log(snapshot1.key); // 
    snapshot.forEach(function(snapshot2) {
      console.log(snapshot2.key); // 

      snapshot2.forEach(function(snapshot3) {
        console.log(snapshot3.key);
        console.log(snapshot3.val().first_name)
    });
  });
});
});

thanks to frank answer here How to retrieve nested child value in Firebase database using javaScript? ty for the help guys

Answer 3

Get it with snapshot.val()[844kh2QXDHgw7i4KBvULpCSO5KE2][-L9MvZxV2bVjcuKGZx-2][age]. See documentation Read and Write Data on the Web

var starCountRef = firebase.database().ref('posts/' + postId + '/starCount');
starCountRef.on('value', function(snapshot) {
  updateStarCount(postElement, snapshot.val());
});