sample json data

my web dict looks like: {
    "columns": [
        "column_name_1",
        "column_name_2",
        "column_name_3"
    ],
    "query_timestamp": "2014-11-30 10:22:45.761029",
    "sitedata": {
        "unit_type_1": {
            "hidden_cols": [
                "2"
            ],
            "rundata": [
                {
                    "column_name_1": 1,
                    "column_name_2": 64,
                    "column_name_3": "HiDischP_sd"
                }
            ]
        },
        "unit_type_2": {
            "hidden_cols": [
                "1",
                "2"
            ],
            "rundata": [
                {
                    "column_name_1": 8,
                    "column_name_2": 43,
                    "column_name_3": "-"
                },
                {
                    "column_name_1": 0,
                    "column_name_2": 6,
                    "column_name_3": "ESD_sd"
                }
            ]
        }
    }
}