I use this code: var formData = new FormData(); for (var i = 0; i < files.length; i++) { var file = files[i]; formData.append('files[]', file, file.name); } $.ajax({ url: '/url', // dataType: 'json', type: 'POST', // Form data data: formData, // Tell jQuery not to process data or worry about content-type // You *must* include these options! en