Defines dateType for the grid If dataType is not defined, the default one comes from w2utils.settings.dataType. This property can be set during object creation: let grid = new w2grid({ name: 'grid', dataType: 'JSON', columns: [ { field: 'recid', text: 'ID', size: '50px' }, { field: 'lname', text: 'Last Name', size: '30%' }, { field: 'fname', text: 'First Name', size: '30%' }, { field: 'email', text: 'Email', size: '40%' }, { field: 'sdate', text: 'Start Date', size: '120px' }, { field: 'sdate', text: 'End Date', size: '120px' } ] }); Or any time during run-time: grid.dataType = 'JSON';