JSON - JavaScript get nested value

Question

Let's say I have this in JavaScript object taken from a Firebase query.

{
    "player": {
        "player:616320": {
            "skills": {
                "main": {
                    "attack": 1,
                    "defence": 1
                }
            },
            "uid": "player:616320",
            "username": "test1",
            "x": 1,
            "y": 1
        }
    }
}

var data = snap.val();

I can do data.username to get test1... but how would I go further? I tried searching JSON nesting and ... it was complicated.

And snap.val() is the JSON object above. How ould I get the attack from main?

Well if data is the whole object then data.username won't work - you'd need data.player["player:616320"].username — Pointy
– Pointy, Commented Jul 25, 2015 at 21:43
If data.username gives you test1, then data is probably player:616320 in the tree. To get the value of attack I would think you can use data.skills.main.attack. — Dan Lowe
– Dan Lowe, Commented Jul 25, 2015 at 21:45
If data.username works then the rest is of the same format. As in data.skills.main.attack to get the value 1. Basically just add . and whatever keys you want or you want to go into. — GillesC
– GillesC, Commented Jul 25, 2015 at 21:46

Spencer Wieczorek · Accepted Answer · 2015-07-25 21:53:18Z

4

In your case it would be:

obj.player["player:616320"].skills.main.attack

Where obj is the JSON object.

It's a tree where after the . is the child like so: parent.child. When there is a value that can't be represented normally you need to do parent["some-Value"].

In your case it seems that playerData is actually the value of obj.player["player:616320"] and not the entire JSON object. In that case the same concept applies:

playerData.skills.main.attack

edited Jul 25, 2015 at 21:53

answered Jul 25, 2015 at 21:45

Spencer Wieczorek

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3 Comments

GillesC Over a year ago

parent["some-value"] would have been a better example :)

Zeng Cheng Over a year ago

I got it using this based off your answer: playerData.skills['main']['attack']

Spencer Wieczorek Over a year ago

@DanF Great! You actually can just do main.attack other than ['main']['attack'], but either way will work fine.

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