I made this project to practice working with bytes, hex and randomness. At firts I didn't really understand how keys were generate, but after testing, I learned that using crypto.getRandomValues() is much safer than Math.random().

Small notes:
1 byte = 8 bits
16 bytes = 128 bits of entropy
Hex uses characters from 0-9 and a-f

Next thing I want to try is using this for encryptation maybe a simple login system.