JavaScript how to process user files without uploading to server?

Question

JavaScript

Good afternoon! Such is the problem - I need to play custom music. the files it throws in the input, but the user->server->user scheme seems a little illogical and inefficient to me.
Is there a way to process (play) user's JS input files BEFORE uploading to the server?

Answer 1

www.html5rocks.com/en/tutorials/file/dndfiles
You can open a file, make it a Blob and paste it as a data uri.