How to create graphics from audio in canvas?

Question

JavaScript

Help who has a resource / article how to create graphics from an audio file not in real time.
the situation is this: I have already created a sound recording and real-time graphics. after I get the blob and send it to the server. I need to create graphics from this which will show the playback. as in VK voice message. although everything is clear in wavesurfer.js, it doesn’t suit me. you need to write your own program