Unable to receive form data in web api c#

I am trying to send the uploaded excel file to web api using XMLHttpRequest but all I receive in web api is an object. How to receive uploaded file in web api?

 upload(file: File): void {
        let formData: FormData = new FormData(),
        xhr: XMLHttpRequest = new XMLHttpRequest();
        formData.append("uploads", file, file.name);
        xhr.open('POST', this._expenseServiceUrl + 'expenses' + '/' + 'massupload', true);


        public HttpResponseMessage MassUpload([FromUri] dynamic uploads)
                response = Request.CreateResponse(HttpStatusCode.OK, "");
            catch (Exception exception)

            return response;


You can read the uploaded file from Request.Files

foreach (string fileId in Request.Files)
   HttpPostedFileBase file = Request.Files[fileId] as HttpPostedFileBase;

Also, you have decorated your uploads parameter with FromUri. You could also change that to FromBody as your file is in your POST body, not the URI.

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