Column

In a column object, properties like width, position and format are set. Further, the data type can be defined.

{
    "type": "data",
    "pos": 3,
    "width": -1,
    "dataType": "number",
    "format": {
        "bold": true
    }
}

See the complete reference: Column Reference

Data Types

The dataType key is used to define the type of data that a column holds. The possible types are text, number, date, timestamp,blank, formula. When setting the data type, it will be applied to the data cells by default. If necessary, this can be changed with the type key. The options here are header, data and summary.