javascript - Adding Meta Data to socketio-file-upload -

i have socketio-file-upload plugin upload photos on server nodejs, work, when try use plugin functionnalaty add data upload, script stuck.

client side

var uploader = new socketiofileupload(socket); uploader.listenoninput(document.getelementbyid("upload"));  uploader.addeventlistener("start", function(event){     event.file.meta.hello = "world"; }); 

sever side

var fileupload = require("socketio-file-upload"); fileupload.listen(app);  io.on('connection', function(socket){     var upl = new fileupload();     upl.dir = "img";     upl.listen(socket);      upl.on("start", function(event){         console.log(event);     }); }); 

the error comes client side event argument has no meta object, , when decide create 1 server side doesn't receive it

the documentation of socketio-file-upload on adding meta data