Append nested object to FormData. The object can be just one level deep. For anything more complex it is recommended to rethink the way you send such data to the server.

formdata.appenObject.js

(function() {
	'use strict';

	if (window.FormData) {
		FormData.prototype.appendObject = function (obj, namespace) {

			// EXAMPLE:
			// var person = { name: 'some name', age: 87 };
			// var fd = new FormData();
			// fd.appenObject(obj, 'person');

			// This appends the keys of the object like this:
			// fd.append('person[name]', 'some name');
			// fd.append('person[age]', 87);

			var keyName;
			for (var key in obj) {
				if (obj.hasOwnProperty(key)) {
					keyName = [namespace, '[', key, ']'].join('');
					this.append(keyName, obj[key]);
				}
			}
		}
		
	}
})();