How to create GUID / UUID?

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I'm trying to create globally-unique identifiers in JavaScript. I'm not sure what routines are available on all browsers, how "random" and seeded the built-in random number generator is, etc.

The GUID / UUID should be at least 32 characters and should stay in the ASCII range to avoid trouble when passing them around.

I'm using this below function, hope it may be useful.

    function NewGuid()
           var sGuid="";
           for (var i=0; i<32; i++)
           return sGuid;

How to Create GUID / UUID in JavaScript?, We can create GUID or UUID in JavaScript using the following methods −Math.​Random() functionTo create or generate UUID or GUID in  To Generate a GUID in Windows 10 with PowerShell, Open PowerShell. Tip: You can add "Open PowerShell As Administrator" context menu. Type or copy-paste the following command: [guid]::NewGuid () .This will produce a new GUID in the output. Alternatively, you can run the command ' {'+ [guid]::NewGuid

A simple solution to generate unique identification is to use time token and add random number to it. I prefer to prefix it with "uuid-". Below function will generate random string of type: uuid-14d93eb1b9b4533e6. One doesn't need to generate 32 chars random string. 16 char random string is more than sufficient in this case to provide the unique UUIDs in javascript.

var createUUID = function() {
  return"uuid-"+((new Date).getTime().toString(16)+Math.floor(1E7*Math.random()).toString(16));

JavaScript Math: Function to create a UUID identifier, Write a JavaScript function to create a UUID identifier. Note : According to Wikipedia - A universally unique identifier (UUID) is an identifier  1. Using sys_guid function. Oracle provide a function called sys_guid () which generates unique identifiers and it can be used, with a simple modification, to generate UUIDs. select SYS_GUID() from dual; Result: SYS_GUID --------------------------------- 7685AF6BCED84898803641EFB4F55B6D.

You could use the npm package guid, a guid generator and validator.


// -> '6fdf6ffc-ed77-94fa-407e-a7b86ed9e59d'

UPDATE: This package has been deprecated. Use uuid instead.


const uuidv4 = require('uuid/v4');
uuidv4(); // ⇨ '10ba038e-48da-487b-96e8-8d3b99b6d18a'

Online GUID Generator, GUID (or UUID) is an acronym for 'Globally Unique Identifier' (or 'Universally Unique Identifier'). It is a 128-bit integer number used to identify resources. g = Guid.NewGuid() Console.WriteLine(g) Console.WriteLine(Guid.NewGuid()) End Sub End Class ' 'This code example produces the following results: ' '0f8fad5b-d9cb-469f-a165-70867728950e '7c9e6679-7425-40de-944b-e07fc1f90ae7 ' Remarks. This is a convenient static method that you can call to get a new Guid.

I found this script useful for creating GUIDs in JavaScript

var myGuid = GUID();

The Quick Guide to GUIDs – BetterExplained, Any way you title it, GUIDs or UUIDs are just big, gigantic ID numbers. The problem with counting is that we want to create ID numbers without the  from typing import Optional import re import subprocess import uuid def get_windows_uuid() -> Optional[uuid.UUID]: try: # Ask Windows for the device's permanent UUID. Throws if command missing/fails. txt = subprocess.check_output("wmic csproduct get uuid").decode() # Attempt to extract the UUID from the command's result.

Here you can find a very small function that generates uuids

One of the final versions is:

function b(
  a                  // placeholder
  var cryptoObj = window.crypto || window.msCrypto; // for IE 11
  return a           // if the placeholder was passed, return
    ? (              // a random number from 0 to 15
      a ^            // unless b is 8,
      cryptoObj.getRandomValues(new Uint8Array(1))[0]  // in which case
      % 16           // a random number from
      >> a/4         // 8 to 11
      ).toString(16) // in hexadecimal
    : (              // or otherwise a concatenated string:
      [1e7] +        // 10000000 +
      -1e3 +         // -1000 +
      -4e3 +         // -4000 +
      -8e3 +         // -80000000 +
      -1e11          // -100000000000,
      ).replace(     // replacing
        /[018]/g,    // zeroes, ones, and eights with
        b            // random hex digits

Universally unique identifier, A universally unique identifier (UUID) is a 128-bit number used to identify information in computer systems. The term globally unique identifier (GUID) is also used, typically in software Thus, anyone can create a UUID and use it to identify something with near certainty that the identifier does not duplicate one that has  UUIDs (Universally Unique IDentifier), also known as GUIDs (Globally Unique IDentifier), according to RFC 4122, are identifiers designed to provide certain uniqueness guarantees.

uuid, RFC4122 (v1, v4, and v5) UUIDs. ExploreBETA · 0Dependencies · 27,365​Dependents · 28Versions. Keywords. uuid · guid · rfc4122. Install. uuid_generate_v5(namespace uuid, name text) – generates a version 5 UUID, which works like a version 3 UUID except that SHA-1 is used as a hashing method. Web Service For example, UUID Generator creates Versions 1 & 3 as well as nil values and GUID .

Generate GUID using JavaScript, For creating GUID / UUID in JavaScript you can use the following code:- function uuidv4() {. The GUIDe: How to make a GUID. The spec isn't exactly light reading so here is a step by step guide created from the specification on how to generate various versions of GUIDs. The structure of a GUID. The format is 16 octets (128 bits) that conform to a specific structure.

Create GUID / UUID in JavaScript?, To create GUID or UUID in JavaScript we can use Math.Random() or ES6 crypto API getRandomValues method.GUID or UUID generated by 

  • GUIDs when repesented as as strings are at least 36 and no more than 38 characters in length and match the pattern ^\{?[a-zA-Z0-9]{36}?\}$ and hence are always ascii.
  • David Bau provides a much better, seedable random number generator at… I wrote up a slightly different approach to generating UUIDs at
  • Weird that no one has mentioned this yet but for completeness, there's a plethora of guid generators on npm I'm willing to bet most of them work in browser too.
  • Thanks for letting me know @inf3rno, I’ve updated my answer with an alternative
  • This uses Math.random under the hood. Therefore broken and likely to suffer collisions in browsers with bad Math.random implementations. Prefer uuid since it uses the crypto API where available.
  • Such approach is still a thing in 2018? Wow :-)
  • This literally calls AWS S3 to get a random ID. If calling a server is okay, you can just have the server generate a UUID.