Convert object to array and remove object instance

Question

In this object-array, there could (!) be structure mistakes like shown below, which I need to get corrected. As you can see, data should be an array with objcts. Sometimes it is an object, which has an object. In this example the last element of group has the field "1", which is wrong. This field name could have different names. I need to remove that.

{
    "group" : [
        {
            "title" : "title 1",
            "data" : [
                {
                    "field 1" : "Lorem ipsum",
                    "field 2" : "dolor"
                },
                {
                    "field 1" : "Lorem ipsum",
                    "field 2" : "dolor"
                },
                {
                    "field 1" : "Lorem ipsum",
                    "field 2" : "dolor"
                }
            ]
        },
        {
            "data" : {  // <-- should be array
                "1" : { // <-- wrong
                    "field 1" : "Lorem ipsum",
                    "field 2" : "dolor"
                }
            }
        }
    ]
}

The result should be:

{
    "group" : [
        {
            "title" : "title 1",
            "data" : [
                {
                    "field 1" : "Lorem ipsum",
                    "field 2" : "dolor"
                },
                {
                    "field 1" : "Lorem ipsum",
                    "field 2" : "dolor"
                },
                {
                    "field 1" : "Lorem ipsum",
                    "field 2" : "dolor"
                }
            ]
        },
        {
            "data" : [
                {
                    "field 1" : "Lorem ipsum",
                    "field 2" : "dolor"
                }
            ]
        }
    ]
}

It does not look like a hard problem. Why haven't you tried yourself? — Jacobian
– Jacobian, Commented Jan 9, 2016 at 18:37

Andreas · Accepted Answer · 2016-01-09 18:50:31Z

1

var data = {
    "group" : [{
            "title" : "title 1",
            "data" : [
                { "field 1" : "Lorem ipsum" }
            ]
        }, {
            "data" : {
                "1" : { "field 1" : "Lorem ipsum" }
            }
        }
    ]
};

// check each group
data.group.forEach(function (g) {
    // is it an array (simple check for "length" property)
    if (typeof g.data.length === "undefined") {
        // if not, convert "data" to an array and replace it in-place
        g.data = Object.keys(g.data).map(function (d) {
                return g.data[d];
            })
    }
});

console.log(JSON.stringify(data));

answered Jan 9, 2016 at 18:50

Andreas

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