Parse array in Json with nodeJs

Question

This is my json:

{

    "xuid":****************,
    "state":"Online",
    "devices":[
        {
            "type":"XboxOne",
            "titles":[
                {
                    "id":750323071,
                    "name":"Accueil",
                    "placement":"Background",
                    "state":"Active",
                    "lastModified":"2018-02-23T17:09:38.4018406Z"
                },
                {
                    "id":1145574011,
                    "activity":{
                        "richPresence":"Dans un salon priv\u00e9"
                    },
                    "name":"Titanfall\u2122 2",
                    "placement":"Full",
                    "state":"Active",
                    "lastModified":"2018-02-23T17:09:38.4018406Z"
                }
            ]
        }
    ]

}

I would like to recover the value: devices->titles->1->activity->richPresence
This is my code with nodeJs:

function (error, response, body) {
    if (!error && response.statusCode === 200) {
        var xbJson = JSON.parse(body);          
        console.log(xbJson.devices.titles[1]['name'])
    }
}

My error:

TypeError: Cannot read property '1' of undefined
    at Request._callback (/home/atmoner/Bureau/xboxlive/test.js:16:40)
    at Request.self.callback (/home/atmoner/Bureau/xboxlive/node_modules/request/request.js:186:22)
    at emitTwo (events.js:125:13)
    at Request.emit (events.js:213:7)
    at Request.<anonymous> (/home/atmoner/Bureau/xboxlive/node_modules/request/request.js:1163:10)
    at emitOne (events.js:115:13)
    at Request.emit (events.js:210:7)
    at IncomingMessage.<anonymous> (/home/atmoner/Bureau/xboxlive/node_modules/request/request.js:1085:12)
    at Object.onceWrapper (events.js:312:19)
    at emitNone (events.js:110:20)

I guess the problem comes from the array in a json and I can not move further.
It may sound simple but I need some help. Thank you!...

Wouldn't it be console.log(xbJson.devices[0].titles[1]['name']) as devices is an array? — gone
– gone, Commented Feb 24, 2018 at 15:39

Ayan · Accepted Answer · 2018-02-24 15:41:49Z

1

Try this out:

console.log(xbJson.devices[0].titles[1]['name'])

answered Feb 24, 2018 at 15:41

Ayan

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4 Comments

atmon3r Over a year ago

TypeError: Cannot read property 'name' of undefined The problem comes after [1] When i try this, it work: console.log(xbJson.devices[0].titles) result: i.imgur.com/CVmX0Zc.jpg

Ayan Over a year ago

devices is an array of length 1,and it contains one object i.e. accessible by devices[0].Instead of writing devices,you need to write devices[0].When you write devices.titles[1] it can't find it because devices is an array,not object.Thus titles remain undefined in your case.

Khauri Over a year ago

@Julien your screenshot shows that the titles array only contains one element, which is different from the JSON provided in your post. You probably want titles[0], not titles[1] in that case. But I would also recommend not hard coding these values either if your titles array can potentially be multiple lengths.

atmon3r Over a year ago

@KhauriMcClain & Ayan My bad!! Indeed, my console was only on the main acch .... so he could not recover something that does not exist! By launching a game, I can recover the good value ... I will opt for a foreach and thus recover all the elements in a loop ... Thank you very much for your help !!

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