Token generation entropy equivalent in Javascript [duplicate]

Question

This small piece of PHP code generates tokens with very good entropy. I would like to know if there is a function in JavaScript that can accomplish the same. Examples are welcome.

Here's the PHP

function getToken($length) {

    $token = "";
    $codeAlphabet  = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    $codeAlphabet .= "abcdefghijklmnopqrstuvwxyz";
    $codeAlphabet .= "0123456789";

    $max = strlen($codeAlphabet);

    for ($i=0; $i < $length; $i++) {
        $token .= $codeAlphabet[random_int(0, $max-1)];
    }

    return $token;
}

echo getToken(24);

score 1 · Accepted Answer · 2020-01-12 16:00:22Z

1

Doing almost the same thing..

function getToken(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(getToken(10));

Example with Jquery

$( document ).ready(function() {

	// set the length of the string
	var stringLength = 10;

	// list containing characters for the random string
	var stringArray = ['0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',
  'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z','!','?'];

	$("#generateToken").click(function (){

		var rndString = "";
	
		// build a string with random characters
		for (var i = 1; i < stringLength; i++) { 
			var rndNum = Math.ceil(Math.random() * stringArray.length) - 1;
			rndString = rndString + stringArray[rndNum];
		};
		
		$("#showToken").html('<p><strong>' + rndString + '<strong></p>');

	});

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<p>Click the button below to generate a new, randomized token.</p>
<button id="generateToken">Generate New Token</button>
<p id="showToken"></p>

edited Jan 12, 2020 at 16:00

answered Jan 12, 2020 at 15:14

user1805543

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4 Comments

suchislife Over a year ago

Nice. Since you've mentioned almost, is there a difference worth noting?

user1805543 Over a year ago

Should be exactly the samething sorry for speling wrong

icecub Over a year ago

At the very least give a reference or close the question as a duplicate when you copy code from a highly upvoted answer: https://stackoverflow.com/questions/1349404/generate-random-string-characters-in-javascript

user1805543 Over a year ago

@icecub I got this from a video tuturoial on youtube to use for reseting password about 3 years ago, guy name was JOHN something, didnt see that answer and didnt copy from there. its a token generating script almost all of them are same if you search on internet. Thanks

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