This is a small and handy file system that anyone can use, just make sure that the files are linked together by having a <script src="filesystem.js"></script> inside of the HTML file you want to work with.
**Note: the saveFile() function inside of filesystem.js saves the files changes. The saveAsFile() function allows the user to save the file to a different location with a different name.
This file system follows the one-video tutorial made by CodePulse, you can find him here. This file system is configurable and you can fork this project in order to add on to it, although I don't know why you would do that because this is as simple as it gets.