generate random character in javascript

1var characters = 'abcdefghijklmnopqrstuvwxyz0123456789';
2var result = ""
3var chaactersLength = characters.length;
4
5for ( var i = 0; i < 5 ; i++ ) {
6    result += characters.charAt(Math.floor(Math.random() * chaactersLength));
7}
8
9console.log(result)

1var crypto = require("crypto");
2var id = crypto.randomBytes(20).toString('hex');
3
4// "bb5dc8842ca31d4603d6aa11448d1654"

1function getRandomString(length) {
2    var randomChars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
3    var result = '';
4    for ( var i = 0; i < length; i++ ) {
5        result += randomChars.charAt(Math.floor(Math.random() * randomChars.length));
6    }
7    return result;
8}
9
10//usage: getRandomString(20); // pass desired length of random string