There is a JavascriptJavaScript library at http://ftp.apixml.net/ that allows FTP file uploads via JavascriptJavaScript.
In this case, technically, the ftpjs server is making the FTP connection to the ftpFTP server, but the instructions are being passed via JavascriptJavaScript. So this particular library is designed primarily to allow developers add a basic file upload mechanism without writing sever side-side code.
Under the hood, it uses the Html5HTML5 FileReader to read the file to a base64 string, and then posts this using Cors ajaxCORS AJAX back to the server.
// Script from http://ftp.apixml.net/ // Copyright 2017 http://ftp.apixml.net/, DO NOT REMOVE THIS COPYRIGHT NOTICE var Ftp = { createCORSRequest: function (method, url) { var xhr = new XMLHttpRequest(); if ("withCredentials" in xhr) { // Check if the XMLHttpRequest object has a "withCredentials" property. // "withCredentials" only exists on XMLHTTPRequest2 objects. xhr.open(method, url, true); } else if (typeof XDomainRequest != "undefined") { // Otherwise, check if XDomainRequest. // XDomainRequest only exists in IE, and is IE's way of making CORS requests. xhr = new XDomainRequest(); xhr.open(method, url); } else { // Otherwise, CORS is not supported by the browser. xhr = null; } return xhr; }, upload: function(token, files) { var file = files[0]; var reader = new FileReader(); reader.readAsDataURL(file); reader.addEventListener("load", function() { var base64 = this.result; var xhr = Ftp.createCORSRequest('POST', "http://ftp.apixml.net/upload.aspx"); if (!xhr) { throw new Error('CORS not supported'); } xhr.onreadystatechange = function() { if (xhr.readyState == 4 && xhr.status == 200) { Ftp.callback(file); } }; xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); xhr.send("token=" + token + "&data=" + encodeURIComponent(base64) + "&file=" + file.name); }, false); }, callback: function(){} }; 
