Generate random string/characters in JavaScript

Question

I want a 5 character string composed of characters picked randomly from the set [a-zA-Z0-9].

What\'s the best way to do this with JavaScript?

Answer 1

A newer version with es6 spread operator:

[...Array(30)].map(() => Math.random().toString(36)[2]).join('')

• The 30 is arbitrary number, you can pick any token length you want
• The 36 is the maximum radix number you can pass to numeric.toString(), which means all numbers and a-z lowercase letters
• The 2 is used to pick the 3th index from the random string which looks like this: "0.mfbiohx64i", we could take any index after 0.