jquery datatables: adding extra column

You can define your columns in a different way
like this

"aoColumns": [
        null,
        null,
        null,
        null,
        null,
        { "mData": null }
    ]

or this

"aoColumnDefs":[
    {
        "aTargets":[5],
        "mData": null
    }
]

Here some docs Columns

Take a look at this DataTables AJAX source example – null data source for a column

Note that prior to DataTables 1.9.2 mData was called mDataProp. The name change reflects the flexibility of this property and is consistent with the naming of mRender. If ‘mDataProp’ is given, then it will still be used by DataTables, as it automatically maps the old name to the new if required.

Another solution/workaround could be adding that ‘5’ parameter…

For example adding extra "" to each row

like this:

    [
        "IT",
        "10030",
        "VILLAREGGIA",
        "TO",
        "Torino",
        ""
    ],
    [
        "IT",
        "10030",
        "VISCHE",
        "TO",
        "Torino",
        ""
    ]