How to send parameter prior to ajax in datatable?

mastersuse

I want to send some parameter with POST method prior to send to datatables ajax. How to do that?

this is the sample of parameter that require to be send prior ajax

{
  "uid": "4",
  "tokenid": "abc123",
  "item": "user",
  "action": "read",
  "type": "1",
  "keyword": ""
}

$('#testTable').DataTable({
    ajax: { 
        url: api_url',
        crossDomain : true,
        type : "POST",
        cache : false,
        dataType : "json",
        contentType: "application/json",
        dataSrc : "data",
    },
    columns: [
        { data : "fullname" },
        { data : "userid" },
        { data : "level" }
    ],
});

rf1234

Check the jQuery ajax documentation for this please:
https://api.jquery.com/jquery.ajax/