Question

I always think it’s going to be easy… I plan to use the json below to build router objects. I put a console.log and so I could have a break point spot so I could try to figure out how to access the the object properties from the chrome console. It never goes into the for loop though.

The main question is how to properly turn the JSON into objects and how to access it’s properties.

<script type="text/javascript">
    $(document).ready(function(){

        $.getJSON('JSON/data.json', function(json) {

            for (var i=0;i<json.length;i++){
                console.log("in for loop");
            }

        });
    });

</script>





{
"_id": {
    "$oid": "4f91f2c9e4b0d0a881cf86c4"
},
"DSC21": {
    "Router": {
        "online": [
            "1",
            "1",
            "1",
            "1",
            "1",
            "1",
            "1",
            "1",
            "1",
            "1"
        ],
        "bytes": [
            "59.5721304971465",
            "17014.1911069063",
            "14858.8518936735",
            "6875.20981475265",
            "15157.6891384625",
            "6363.47544785913",
            "29446.2111270486",
            "11517.9296243171",
            "27077.9747917112",
            "19867.79381695"
        ]
    }
},
"DSC22": {
    "Router": {
        "online": [
            "1",
            "1",
            "1",
            "1",
            "1",
            "1",
            "1",
            "1",
            "1",
            "1"
        ],
        "bytes": [
            "59.5721304971465",
            "17014.1911069063",
            "14858.8518936735",
            "6875.20981475265",
            "15157.6891384625",
            "6363.47544785913",
            "29446.2111270486",
            "11517.9296243171",
            "27077.9747917112",
            "19867.79381695"
        ]
    }
},
"DSC23": {
    "Router": {
        "online": [
            "1",
            "1",
            "1",
            "1",
            "1",
            "1",
            "1",
            "1",
            "1",
            "1"
        ],
        "bytes": [
            "59.5721304971465",
            "17014.1911069063",
            "14858.8518936735",
            "6875.20981475265",
            "15157.6891384625",
            "6363.47544785913",
            "29446.2111270486",
            "11517.9296243171",
            "27077.9747917112",
            "19867.79381695"
        ]
    }
},
"DSC24": {
    "Router": {
        "online": [
            "1",
            "1",
            "1",
            "1",
            "1",
            "1",
            "1",
            "1",
            "1",
            "1"
        ],
        "bytes": [
            "59.5721304971465",
            "17014.1911069063",
            "14858.8518936735",
            "6875.20981475265",
            "15157.6891384625",
            "6363.47544785913",
            "29446.2111270486",
            "11517.9296243171",
            "27077.9747917112",
            "19867.79381695"
        ]
    }
}

}

Answer 1

JSON is natively available in JavaScript, you traverse it like you would traverse any object or array.

json["DSC21"]["Router"]["online"][0];    // 1
json.DSC21.Router.online[0];    // equivalent
json.DSC21.Router.online.0;    // INCORRECT

If you don’t know the names of the properties and want to loop through them use the for .. in construction:

for (var key in json) {
    console.log(key);   // _id, DSC21, DCS22 etc..
    console.log(json[key]);    // { "$oid": "" }, { "Router": ".." } etc.
}

This does leave the hasOwnProperty issue, but it shouldn’t be a problem if you’re just reading JSON data.