hope following example will help you
var items = new Array();
$.getJSON(uri)
.done(function (data) {
// On success, 'data' contains a list of products.
$.each(data, function (key, item) {
$('<li>', { text: item.UserName }).appendTo($('#users'));
items.push(item.DisplayName);
});
$("#tags").kendoAutoComplete({
dataSource: items,
filter: "startswith",
placeholder: "Select User...",
separator: ", "
});
});