file-upload-jquery-formdata.js

var fileUpload = $(".files-upload").get(0);
var files = fileUpload.files;
var data = new FormData();
for (var i = 0; i < files.length ; i++) {
    data.append(files[i].name, files[i]);
}
data.append("test", "1");
$.ajax({
    type: "POST",
    url: "/api/v1/files/",
    contentType: false,
    processData: false,
    data: data,
    success: function (message) {
        console.log(message);
    },
    error: function () {
        console.log("There was error uploading files!");
    }
});