After playing around with the variable i saw it could be declared
var someData = [{id:"1",age:"44",name:"John"},
{ id:"2",age:"25",name:"Doe"},
{ id:"3",age:"30",name:"Alice"}];
var formData = {MyData:someData}
function SendData() {
var xhrArgs = {
url:'processData',
postData: dojo.toJson(formData),
handleAs: "json",
headers: { "Content-Type": "application/json", "Accept": "application/json" },
load:function(data){
console.log('data was posted');
},
error:function(error){
console.log(error);
}
};
dojo.xhrPost(xhrArgs);