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-- This file is auto-generated from README_js.md. Changes should be made there.
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# uuid [](https://github.com/uuidjs/uuid/actions?query=workflow%3ACI) [](https://github.com/uuidjs/uuid/actions?query=workflow%3ABrowser)
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For the creation of [RFC4122](http://www.ietf.org/rfc/rfc4122.txt) UUIDs
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- **Complete** - Support for RFC4122 version 1, 3, 4, and 5 UUIDs
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- **Cross-platform** - Support for ...
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- CommonJS, [ECMAScript Modules](#ecmascript-modules) and [CDN builds](#cdn-builds)
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- Node 8, 10, 12, 14
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- Chrome, Safari, Firefox, Edge, IE 11 browsers
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- Webpack and rollup.js module bundlers
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- [React Native / Expo](#react-native--expo)
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- **Secure** - Cryptographically-strong random values
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- **Small** - Zero-dependency, small footprint, plays nice with "tree shaking" packagers
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- **CLI** - Includes the [`uuid` command line](#command-line) utility
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**Upgrading from `uuid@3.x`?** Your code is probably okay, but check out [Upgrading From `uuid@3.x`](#upgrading-from-uuid3x) for details.
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## Quickstart
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To create a random UUID...
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**1. Install**
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```shell
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npm install uuid
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```
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**2. Create a UUID** (ES6 module syntax)
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```javascript
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import { v4 as uuidv4 } from 'uuid';
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uuidv4(); // ⇨ '9b1deb4d-3b7d-4bad-9bdd-2b0d7b3dcb6d'
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```
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... or using CommonJS syntax:
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```javascript
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const { v4: uuidv4 } = require('uuid');
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uuidv4(); // ⇨ '1b9d6bcd-bbfd-4b2d-9b5d-ab8dfbbd4bed'
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```
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For timestamp UUIDs, namespace UUIDs, and other options read on ...
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## API Summary
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| --- | --- | --- |
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| [`uuid.NIL`](#uuidnil) | The nil UUID string (all zeros) | New in `uuid@8.3` |
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| [`uuid.parse()`](#uuidparsestr) | Convert UUID string to array of bytes | New in `uuid@8.3` |
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| [`uuid.stringify()`](#uuidstringifyarr-offset) | Convert array of bytes to UUID string | New in `uuid@8.3` |
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| [`uuid.v1()`](#uuidv1options-buffer-offset) | Create a version 1 (timestamp) UUID | |
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| [`uuid.v3()`](#uuidv3name-namespace-buffer-offset) | Create a version 3 (namespace w/ MD5) UUID | |
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| [`uuid.v4()`](#uuidv4options-buffer-offset) | Create a version 4 (random) UUID | |
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| [`uuid.v5()`](#uuidv5name-namespace-buffer-offset) | Create a version 5 (namespace w/ SHA-1) UUID | |
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| [`uuid.validate()`](#uuidvalidatestr) | Test a string to see if it is a valid UUID | New in `uuid@8.3` |
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| [`uuid.version()`](#uuidversionstr) | Detect RFC version of a UUID | New in `uuid@8.3` |
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## API
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### uuid.NIL
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The nil UUID string (all zeros).
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Example:
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```javascript
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import { NIL as NIL_UUID } from 'uuid';
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NIL_UUID; // ⇨ '00000000-0000-0000-0000-000000000000'
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```
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### uuid.parse(str)
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Convert UUID string to array of bytes
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| --------- | ---------------------------------------- |
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| `str` | A valid UUID `String` |
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| _returns_ | `Uint8Array[16]` |
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| _throws_ | `TypeError` if `str` is not a valid UUID |
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Note: Ordering of values in the byte arrays used by `parse()` and `stringify()` follows the left ↠ right order of hex-pairs in UUID strings. As shown in the example below.
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Example:
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```javascript
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import { parse as uuidParse } from 'uuid';
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// Parse a UUID
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const bytes = uuidParse('6ec0bd7f-11c0-43da-975e-2a8ad9ebae0b');
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// Convert to hex strings to show byte order (for documentation purposes)
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[...bytes].map((v) => v.toString(16).padStart(2, '0')); // ⇨
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// [
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// '6e', 'c0', 'bd', '7f',
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// '11', 'c0', '43', 'da',
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// '97', '5e', '2a', '8a',
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// 'd9', 'eb', 'ae', '0b'
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// ]
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```
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### uuid.stringify(arr[, offset])
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Convert array of bytes to UUID string
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| -------------- | ---------------------------------------------------------------------------- |
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| `arr` | `Array`-like collection of 16 values (starting from `offset`) between 0-255. |
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| [`offset` = 0] | `Number` Starting index in the Array |
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| _returns_ | `String` |
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| _throws_ | `TypeError` if a valid UUID string cannot be generated |
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Note: Ordering of values in the byte arrays used by `parse()` and `stringify()` follows the left ↠ right order of hex-pairs in UUID strings. As shown in the example below.
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Example:
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```javascript
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import { stringify as uuidStringify } from 'uuid';
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const uuidBytes = [
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0x6e,
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0xc0,
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0xbd,
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0x7f,
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0x11,
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0xc0,
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0x43,
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0xda,
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0x97,
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0x5e,
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0x2a,
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0x8a,
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0xd9,
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0xeb,
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0xae,
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0x0b,
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];
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uuidStringify(uuidBytes); // ⇨ '6ec0bd7f-11c0-43da-975e-2a8ad9ebae0b'
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```
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### uuid.v1([options[, buffer[, offset]]])
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Create an RFC version 1 (timestamp) UUID
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| --- | --- |
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| [`options`] | `Object` with one or more of the following properties: |
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| [`options.node` ] | RFC "node" field as an `Array[6]` of byte values (per 4.1.6) |
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| [`options.clockseq`] | RFC "clock sequence" as a `Number` between 0 - 0x3fff |
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| [`options.msecs`] | RFC "timestamp" field (`Number` of milliseconds, unix epoch) |
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| [`options.nsecs`] | RFC "timestamp" field (`Number` of nanseconds to add to `msecs`, should be 0-10,000) |
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| [`options.random`] | `Array` of 16 random bytes (0-255) |
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| [`options.rng`] | Alternative to `options.random`, a `Function` that returns an `Array` of 16 random bytes (0-255) |
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| [`buffer`] | `Array \| Buffer` If specified, uuid will be written here in byte-form, starting at `offset` |
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| [`offset` = 0] | `Number` Index to start writing UUID bytes in `buffer` |
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| _returns_ | UUID `String` if no `buffer` is specified, otherwise returns `buffer` |
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| _throws_ | `Error` if more than 10M UUIDs/sec are requested |
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Note: The default [node id](https://tools.ietf.org/html/rfc4122#section-4.1.6) (the last 12 digits in the UUID) is generated once, randomly, on process startup, and then remains unchanged for the duration of the process.
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Note: `options.random` and `options.rng` are only meaningful on the very first call to `v1()`, where they may be passed to initialize the internal `node` and `clockseq` fields.
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Example:
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```javascript
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import { v1 as uuidv1 } from 'uuid';
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uuidv1(); // ⇨ '2c5ea4c0-4067-11e9-8bad-9b1deb4d3b7d'
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```
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Example using `options`:
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```javascript
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import { v1 as uuidv1 } from 'uuid';
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const v1options = {
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node: [0x01, 0x23, 0x45, 0x67, 0x89, 0xab],
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clockseq: 0x1234,
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msecs: new Date('2011-11-01').getTime(),
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nsecs: 5678,
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};
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uuidv1(v1options); // ⇨ '710b962e-041c-11e1-9234-0123456789ab'
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```
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### uuid.v3(name, namespace[, buffer[, offset]])
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Create an RFC version 3 (namespace w/ MD5) UUID
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API is identical to `v5()`, but uses "v3" instead.
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⚠️ Note: Per the RFC, "_If backward compatibility is not an issue, SHA-1 [Version 5] is preferred_."
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### uuid.v4([options[, buffer[, offset]]])
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Create an RFC version 4 (random) UUID
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| --- | --- |
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| [`options`] | `Object` with one or more of the following properties: |
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| [`options.random`] | `Array` of 16 random bytes (0-255) |
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| [`options.rng`] | Alternative to `options.random`, a `Function` that returns an `Array` of 16 random bytes (0-255) |
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| [`buffer`] | `Array \| Buffer` If specified, uuid will be written here in byte-form, starting at `offset` |
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| [`offset` = 0] | `Number` Index to start writing UUID bytes in `buffer` |
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| _returns_ | UUID `String` if no `buffer` is specified, otherwise returns `buffer` |
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Example:
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```javascript
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import { v4 as uuidv4 } from 'uuid';
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uuidv4(); // ⇨ '1b9d6bcd-bbfd-4b2d-9b5d-ab8dfbbd4bed'
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```
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Example using predefined `random` values:
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```javascript
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import { v4 as uuidv4 } from 'uuid';
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const v4options = {
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random: [
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0x10,
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0x91,
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0x56,
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0xbe,
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0xc4,
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0xfb,
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0xc1,
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0xea,
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0x71,
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0xb4,
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0xef,
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0xe1,
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0x67,
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0x1c,
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0x58,
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0x36,
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],
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};
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uuidv4(v4options); // ⇨ '109156be-c4fb-41ea-b1b4-efe1671c5836'
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```
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### uuid.v5(name, namespace[, buffer[, offset]])
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Create an RFC version 5 (namespace w/ SHA-1) UUID
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| --- | --- |
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| `name` | `String \| Array` |
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| `namespace` | `String \| Array[16]` Namespace UUID |
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| [`buffer`] | `Array \| Buffer` If specified, uuid will be written here in byte-form, starting at `offset` |
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| [`offset` = 0] | `Number` Index to start writing UUID bytes in `buffer` |
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| _returns_ | UUID `String` if no `buffer` is specified, otherwise returns `buffer` |
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Note: The RFC `DNS` and `URL` namespaces are available as `v5.DNS` and `v5.URL`.
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Example with custom namespace:
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```javascript
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import { v5 as uuidv5 } from 'uuid';
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// Define a custom namespace. Readers, create your own using something like
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// https://www.uuidgenerator.net/
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const MY_NAMESPACE = '1b671a64-40d5-491e-99b0-da01ff1f3341';
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uuidv5('Hello, World!', MY_NAMESPACE); // ⇨ '630eb68f-e0fa-5ecc-887a-7c7a62614681'
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```
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Example with RFC `URL` namespace:
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```javascript
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import { v5 as uuidv5 } from 'uuid';
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uuidv5('https://www.w3.org/', uuidv5.URL); // ⇨ 'c106a26a-21bb-5538-8bf2-57095d1976c1'
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```
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### uuid.validate(str)
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Test a string to see if it is a valid UUID
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| --------- | --------------------------------------------------- |
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| `str` | `String` to validate |
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| _returns_ | `true` if string is a valid UUID, `false` otherwise |
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Example:
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```javascript
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import { validate as uuidValidate } from 'uuid';
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uuidValidate('not a UUID'); // ⇨ false
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uuidValidate('6ec0bd7f-11c0-43da-975e-2a8ad9ebae0b'); // ⇨ true
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```
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Using `validate` and `version` together it is possible to do per-version validation, e.g. validate for only v4 UUIds.
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```javascript
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import { version as uuidVersion } from 'uuid';
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import { validate as uuidValidate } from 'uuid';
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function uuidValidateV4(uuid) {
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return uuidValidate(uuid) && uuidVersion(uuid) === 4;
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}
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const v1Uuid = 'd9428888-122b-11e1-b85c-61cd3cbb3210';
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const v4Uuid = '109156be-c4fb-41ea-b1b4-efe1671c5836';
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uuidValidateV4(v4Uuid); // ⇨ true
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uuidValidateV4(v1Uuid); // ⇨ false
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```
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### uuid.version(str)
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Detect RFC version of a UUID
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| --------- | ---------------------------------------- |
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| `str` | A valid UUID `String` |
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| _returns_ | `Number` The RFC version of the UUID |
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| _throws_ | `TypeError` if `str` is not a valid UUID |
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Example:
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```javascript
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import { version as uuidVersion } from 'uuid';
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uuidVersion('45637ec4-c85f-11ea-87d0-0242ac130003'); // ⇨ 1
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uuidVersion('6ec0bd7f-11c0-43da-975e-2a8ad9ebae0b'); // ⇨ 4
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```
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## Command Line
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UUIDs can be generated from the command line using `uuid`.
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```shell
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$ uuid
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ddeb27fb-d9a0-4624-be4d-4615062daed4
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```
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The default is to generate version 4 UUIDS, however the other versions are supported. Type `uuid --help` for details:
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```shell
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$ uuid --help
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Usage:
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uuid
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uuid v1
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uuid v3 <name> <namespace uuid>
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uuid v4
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uuid v5 <name> <namespace uuid>
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uuid --help
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Note: <namespace uuid> may be "URL" or "DNS" to use the corresponding UUIDs
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defined by RFC4122
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```
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## ECMAScript Modules
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This library comes with [ECMAScript Modules](https://www.ecma-international.org/ecma-262/6.0/#sec-modules) (ESM) support for Node.js versions that support it ([example](./examples/node-esmodules/)) as well as bundlers like [rollup.js](https://rollupjs.org/guide/en/#tree-shaking) ([example](./examples/browser-rollup/)) and [webpack](https://webpack.js.org/guides/tree-shaking/) ([example](./examples/browser-webpack/)) (targeting both, Node.js and browser environments).
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```javascript
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import { v4 as uuidv4 } from 'uuid';
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uuidv4(); // ⇨ '1b9d6bcd-bbfd-4b2d-9b5d-ab8dfbbd4bed'
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```
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To run the examples you must first create a dist build of this library in the module root:
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```shell
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npm run build
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```
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## CDN Builds
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### ECMAScript Modules
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To load this module directly into modern browsers that [support loading ECMAScript Modules](https://caniuse.com/#feat=es6-module) you can make use of [jspm](https://jspm.org/):
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```html
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<script type="module">
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import { v4 as uuidv4 } from 'https://jspm.dev/uuid';
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console.log(uuidv4()); // ⇨ '1b9d6bcd-bbfd-4b2d-9b5d-ab8dfbbd4bed'
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</script>
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```
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### UMD
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To load this module directly into older browsers you can use the [UMD (Universal Module Definition)](https://github.com/umdjs/umd) builds from any of the following CDNs:
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**Using [UNPKG](https://unpkg.com/uuid@latest/dist/umd/)**:
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```html
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<script src="https://unpkg.com/uuid@latest/dist/umd/uuidv4.min.js"></script>
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```
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**Using [jsDelivr](https://cdn.jsdelivr.net/npm/uuid@latest/dist/umd/)**:
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```html
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<script src="https://cdn.jsdelivr.net/npm/uuid@latest/dist/umd/uuidv4.min.js"></script>
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```
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**Using [cdnjs](https://cdnjs.com/libraries/uuid)**:
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```html
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<script src="https://cdnjs.cloudflare.com/ajax/libs/uuid/8.1.0/uuidv4.min.js"></script>
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```
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These CDNs all provide the same [`uuidv4()`](#uuidv4options-buffer-offset) method:
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```html
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<script>
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uuidv4(); // ⇨ '55af1e37-0734-46d8-b070-a1e42e4fc392'
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</script>
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```
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Methods for the other algorithms ([`uuidv1()`](#uuidv1options-buffer-offset), [`uuidv3()`](#uuidv3name-namespace-buffer-offset) and [`uuidv5()`](#uuidv5name-namespace-buffer-offset)) are available from the files `uuidv1.min.js`, `uuidv3.min.js` and `uuidv5.min.js` respectively.
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## "getRandomValues() not supported"
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This error occurs in environments where the standard [`crypto.getRandomValues()`](https://developer.mozilla.org/en-US/docs/Web/API/Crypto/getRandomValues) API is not supported. This issue can be resolved by adding an appropriate polyfill:
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### React Native / Expo
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1. Install [`react-native-get-random-values`](https://github.com/LinusU/react-native-get-random-values#readme)
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1. Import it _before_ `uuid`. Since `uuid` might also appear as a transitive dependency of some other imports it's safest to just import `react-native-get-random-values` as the very first thing in your entry point:
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```javascript
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import 'react-native-get-random-values';
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import { v4 as uuidv4 } from 'uuid';
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```
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Note: If you are using Expo, you must be using at least `react-native-get-random-values@1.5.0` and `expo@39.0.0`.
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### Web Workers / Service Workers (Edge <= 18)
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[In Edge <= 18, Web Crypto is not supported in Web Workers or Service Workers](https://caniuse.com/#feat=cryptography) and we are not aware of a polyfill (let us know if you find one, please).
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## Upgrading From `uuid@7.x`
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### Only Named Exports Supported When Using with Node.js ESM
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`uuid@7.x` did not come with native ECMAScript Module (ESM) support for Node.js. Importing it in Node.js ESM consequently imported the CommonJS source with a default export. This library now comes with true Node.js ESM support and only provides named exports.
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Instead of doing:
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```javascript
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import uuid from 'uuid';
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uuid.v4();
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```
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you will now have to use the named exports:
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```javascript
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import { v4 as uuidv4 } from 'uuid';
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uuidv4();
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```
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### Deep Requires No Longer Supported
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Deep requires like `require('uuid/v4')` [which have been deprecated in `uuid@7.x`](#deep-requires-now-deprecated) are no longer supported.
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## Upgrading From `uuid@3.x`
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"_Wait... what happened to `uuid@4.x` - `uuid@6.x`?!?_"
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In order to avoid confusion with RFC [version 4](#uuidv4options-buffer-offset) and [version 5](#uuidv5name-namespace-buffer-offset) UUIDs, and a possible [version 6](http://gh.peabody.io/uuidv6/), releases 4 thru 6 of this module have been skipped.
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### Deep Requires Now Deprecated
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`uuid@3.x` encouraged the use of deep requires to minimize the bundle size of browser builds:
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```javascript
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const uuidv4 = require('uuid/v4'); // <== NOW DEPRECATED!
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uuidv4();
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```
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As of `uuid@7.x` this library now provides ECMAScript modules builds, which allow packagers like Webpack and Rollup to do "tree-shaking" to remove dead code. Instead, use the `import` syntax:
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```javascript
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|
import { v4 as uuidv4 } from 'uuid';
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uuidv4();
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```
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... or for CommonJS:
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|
```javascript
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|
const { v4: uuidv4 } = require('uuid');
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|
uuidv4();
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|
```
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### Default Export Removed
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`uuid@3.x` was exporting the Version 4 UUID method as a default export:
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|
```javascript
|
|
const uuid = require('uuid'); // <== REMOVED!
|
|
```
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This usage pattern was already discouraged in `uuid@3.x` and has been removed in `uuid@7.x`.
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----
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Markdown generated from [README_js.md](README_js.md) by [](https://github.com/broofa/runmd) |