Generate random string/characters in JavaScript

Question

I want a string of 5 characters picked randomly from the set [a-zA-Z0-9]. What is the best way to do it?

Answer 1

You can do it like this:

function makeString(length) {

   var result  = '';

   var characters  = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';

   var charactersLength = characters.length;

   for ( var i = 0; i < length; i++ ) {

      result += characters.charAt(Math.floor(Math.random() * charactersLength));

   }

   return result;

}

console.log(makeString(5));

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