Javascript : I cannot access JSON objects inside an array using array index

Question

database.ref().once("value", function (snap) {
    scores = snap.val();
    console.log(scores);
    console.log(scores[1]);
});

scores is an array of JSON objects taken from a firebase database.

However, I cannot access the objects inside the array.

I assume that scores[1] would print.

-L1qn0mBwpny-7FVzlCF : {Name: "Josh", Score: 9}

But it prints undefined.

is it not array, this is JSON object. you can access it via scores['-L1qn0mBwpny-7FVzlCF'] — Tareq
– Tareq, Commented Jan 2, 2018 at 16:34

31piy · Accepted Answer · 2018-01-02 16:35:43Z

2

No, it won't print it because scores is a JavaScript object, and not an array. Plus, there is no key 1 in that object.

To get the underlying object of key -L1qn0mBwpny-7FVzlCF, you need to access it like this:

scores['-L1qn0mBwpny-7FVzlCF'] // { "Name": "Josh", "Score": 9 }

answered Jan 2, 2018 at 16:35

31piy

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2 Comments

Is there a way I can iterate through this like an array. The keys are auto generated so I don't know about them?

Yes of course! Please read about Object.keys.