How to save the values ​​of variables to a file in JS and then load them back?

Question

JavaScript

I made a simple clicker in JS. It is necessary to save the progress before exiting the game (as I understand it, the simplest thing is to save the variables to a file on the computer). When entering the game, load variables from a file into the main js code

Answer 1

You can save variables to a file on your computer, but it will look like downloading a file. Loading is exactly the same, through the standard file selection dialog. This can be useful for a player who wants to continue playing on another computer.
For this you will need: URL.createObjectURL , <a download>and <input type="file">.
Example:
If such functionality is not planned, then simply write to localStorage, or, if there is a lot of data, to indexedDB.

Answer 2

localStorage
sessionStorage
IndexedDB