How can I set the text fields of YouTube videos with a script?

Question

YouTube

There are 40 videos on the YouTube channel, I need to automatically (by running the script) set test attributes (title, description) for all my videos.
How can I do that?
There is an assumption that it is possible to fake a POST request and pass values ​​in the parameter.
Or perhaps through the API. Something hasn't worked out so far.
Who can face?

Answer 1

I often do automation of such small tasks for myself in the form of javascript code. it's quite easy to emulate user input (clicks). or directly dom edit.
launch from the browser console or you can create a bookmark in the browser with javascript.
if there were thousands, it would be possible to get confused with the api or fake post requests, but there will be problems with authorization, and requests can be difficult to analyze. and javasctipt already has full access.