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

1function makeid(length) {
2    var result           = [];
3    var characters       = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
4    var charactersLength = characters.length;
5    for ( var i = 0; i < length; i++ ) {
6      result.push(characters.charAt(Math.floor(Math.random() * 
7 charactersLength)));
8   }
9   return result.join('');
10}
11
12console.log(makeid(5));

11.
2function makeid(length) {
3    var result           = '';
4    var characters       = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
5    var charactersLength = characters.length;
6    for ( var i = 0; i < length; i++ ) {
7      result += characters.charAt(Math.floor(Math.random() * 
8 charactersLength));
9   }
10   return result;
11}
12
132.
14let r = (Math.random() + 1).toString(36).substring(7);
15console.log("random", r);
16
173.
18function randomString(len) {
19  var str = "";                                // String result
20  for (var i = 0; i < len; i++) {              // Loop `len` times
21    var rand = Math.floor(Math.random() * 62); // random: 0..61
22    var charCode = rand += rand > 9 ? (rand < 36 ? 55 : 61) : 48; // Get correct charCode
23    str += String.fromCharCode(charCode);      // add Character to str
24  }
25  return str; // After all loops are done, return the concatenated string
26}
27console.log(randomString(10));