In what directory lies the local storage of a webview on macOS?

Question

In other words how can I delete an app's webview data without having access to the web developer tools of the webview? Where is it stored?

Answer 1

Searching through my ~/Library folder I stumbled upon it:

A webview of an application with the package id your.package.id will store localstorage, cookies, etc. in /Users/your-username/Library/WebKit/your.package.id (where your-username needs to be replaced by whatever your username is ;-).

So deleting this directory will clear all data created by the webview.

I run macOS Mojave, but my guess is this won't change often.