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# uuid [![CI](https://github.com/uuidjs/uuid/workflows/CI/badge.svg)](https://github.com/uuidjs/uuid/actions?query=workflow%3ACI) [![Browser](https://github.com/uuidjs/uuid/workflows/Browser/badge.svg)](https://github.com/uuidjs/uuid/actions?query=workflow%3ABrowser)

For the creation of [RFC4122](http://www.ietf.org/rfc/rfc4122.txt) UUIDs

- **Complete** - Support for RFC4122 version 1, 3, 4, and 5 UUIDs
- **Cross-platform** - Support for ...
  - CommonJS, [ECMAScript Modules](#ecmascript-modules) and [CDN builds](#cdn-builds)
  - Node 8, 10, 12, 14
  - Chrome, Safari, Firefox, Edge, IE 11 browsers
  - Webpack and rollup.js module bundlers
  - [React Native / Expo](#react-native--expo)
- **Secure** - Cryptographically-strong random values
- **Small** - Zero-dependency, small footprint, plays nice with "tree shaking" packagers
- **CLI** - Includes the [`uuid` command line](#command-line) utility

**Upgrading from `uuid@3.x`?** Your code is probably okay, but check out [Upgrading From `uuid@3.x`](#upgrading-from-uuid3x) for details.

## Quickstart

To create a random UUID...

**1. Install**

```shell
npm install uuid
```

**2. Create a UUID** (ES6 module syntax)

```javascript
import { v4 as uuidv4 } from 'uuid';
uuidv4(); // ⇨ '9b1deb4d-3b7d-4bad-9bdd-2b0d7b3dcb6d'
```

... or using CommonJS syntax:

```javascript
const { v4: uuidv4 } = require('uuid');
uuidv4(); // ⇨ '1b9d6bcd-bbfd-4b2d-9b5d-ab8dfbbd4bed'
```

For timestamp UUIDs, namespace UUIDs, and other options read on ...

## API Summary

|  |  |  |
| --- | --- | --- |
| [`uuid.NIL`](#uuidnil) | The nil UUID string (all zeros) | New in `uuid@8.3` |
| [`uuid.parse()`](#uuidparsestr) | Convert UUID string to array of bytes | New in `uuid@8.3` |
| [`uuid.stringify()`](#uuidstringifyarr-offset) | Convert array of bytes to UUID string | New in `uuid@8.3` |
| [`uuid.v1()`](#uuidv1options-buffer-offset) | Create a version 1 (timestamp) UUID |  |
| [`uuid.v3()`](#uuidv3name-namespace-buffer-offset) | Create a version 3 (namespace w/ MD5) UUID |  |
| [`uuid.v4()`](#uuidv4options-buffer-offset) | Create a version 4 (random) UUID |  |
| [`uuid.v5()`](#uuidv5name-namespace-buffer-offset) | Create a version 5 (namespace w/ SHA-1) UUID |  |
| [`uuid.validate()`](#uuidvalidatestr) | Test a string to see if it is a valid UUID | New in `uuid@8.3` |
| [`uuid.version()`](#uuidversionstr) | Detect RFC version of a UUID | New in `uuid@8.3` |

## API

### uuid.NIL

The nil UUID string (all zeros).

Example:

```javascript
import { NIL as NIL_UUID } from 'uuid';

NIL_UUID; // ⇨ '00000000-0000-0000-0000-000000000000'
```

### uuid.parse(str)

Convert UUID string to array of bytes

|           |                                          |
| --------- | ---------------------------------------- |
| `str`     | A valid UUID `String`                    |
| _returns_ | `Uint8Array[16]`                         |
| _throws_  | `TypeError` if `str` is not a valid UUID |

Note: Ordering of values in the byte arrays used by `parse()` and `stringify()` follows the left &Rarr; right order of hex-pairs in UUID strings. As shown in the example below.

Example:

```javascript
import { parse as uuidParse } from 'uuid';

// Parse a UUID
const bytes = uuidParse('6ec0bd7f-11c0-43da-975e-2a8ad9ebae0b');

// Convert to hex strings to show byte order (for documentation purposes)
[...bytes].map((v) => v.toString(16).padStart(2, '0')); // ⇨ 
  // [
  //   '6e', 'c0', 'bd', '7f',
  //   '11', 'c0', '43', 'da',
  //   '97', '5e', '2a', '8a',
  //   'd9', 'eb', 'ae', '0b'
  // ]
```

### uuid.stringify(arr[, offset])

Convert array of bytes to UUID string

|                |                                                                              |
| -------------- | ---------------------------------------------------------------------------- |
| `arr`          | `Array`-like collection of 16 values (starting from `offset`) between 0-255. |
| [`offset` = 0] | `Number` Starting index in the Array                                         |
| _returns_      | `String`                                                                     |
| _throws_       | `TypeError` if a valid UUID string cannot be generated                       |

Note: Ordering of values in the byte arrays used by `parse()` and `stringify()` follows the left &Rarr; right order of hex-pairs in UUID strings. As shown in the example below.

Example:

```javascript
import { stringify as uuidStringify } from 'uuid';

const uuidBytes = [
  0x6e,
  0xc0,
  0xbd,
  0x7f,
  0x11,
  0xc0,
  0x43,
  0xda,
  0x97,
  0x5e,
  0x2a,
  0x8a,
  0xd9,
  0xeb,
  0xae,
  0x0b,
];

uuidStringify(uuidBytes); // ⇨ '6ec0bd7f-11c0-43da-975e-2a8ad9ebae0b'
```

### uuid.v1([options[, buffer[, offset]]])

Create an RFC version 1 (timestamp) UUID

|  |  |
| --- | --- |
| [`options`] | `Object` with one or more of the following properties: |
| [`options.node` ] | RFC "node" field as an `Array[6]` of byte values (per 4.1.6) |
| [`options.clockseq`] | RFC "clock sequence" as a `Number` between 0 - 0x3fff |
| [`options.msecs`] | RFC "timestamp" field (`Number` of milliseconds, unix epoch) |
| [`options.nsecs`] | RFC "timestamp" field (`Number` of nanseconds to add to `msecs`, should be 0-10,000) |
| [`options.random`] | `Array` of 16 random bytes (0-255) |
| [`options.rng`] | Alternative to `options.random`, a `Function` that returns an `Array` of 16 random bytes (0-255) |
| [`buffer`] | `Array \| Buffer` If specified, uuid will be written here in byte-form, starting at `offset` |
| [`offset` = 0] | `Number` Index to start writing UUID bytes in `buffer` |
| _returns_ | UUID `String` if no `buffer` is specified, otherwise returns `buffer` |
| _throws_ | `Error` if more than 10M UUIDs/sec are requested |

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.

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.

Example:

```javascript
import { v1 as uuidv1 } from 'uuid';

uuidv1(); // ⇨ '2c5ea4c0-4067-11e9-8bad-9b1deb4d3b7d'
```

Example using `options`:

```javascript
import { v1 as uuidv1 } from 'uuid';

const v1options = {
  node: [0x01, 0x23, 0x45, 0x67, 0x89, 0xab],
  clockseq: 0x1234,
  msecs: new Date('2011-11-01').getTime(),
  nsecs: 5678,
};
uuidv1(v1options); // ⇨ '710b962e-041c-11e1-9234-0123456789ab'
```

### uuid.v3(name, namespace[, buffer[, offset]])

Create an RFC version 3 (namespace w/ MD5) UUID

API is identical to `v5()`, but uses "v3" instead.

&#x26a0;&#xfe0f; Note: Per the RFC, "_If backward compatibility is not an issue, SHA-1 [Version 5] is preferred_."

### uuid.v4([options[, buffer[, offset]]])

Create an RFC version 4 (random) UUID

|  |  |
| --- | --- |
| [`options`] | `Object` with one or more of the following properties: |
| [`options.random`] | `Array` of 16 random bytes (0-255) |
| [`options.rng`] | Alternative to `options.random`, a `Function` that returns an `Array` of 16 random bytes (0-255) |
| [`buffer`] | `Array \| Buffer` If specified, uuid will be written here in byte-form, starting at `offset` |
| [`offset` = 0] | `Number` Index to start writing UUID bytes in `buffer` |
| _returns_ | UUID `String` if no `buffer` is specified, otherwise returns `buffer` |

Example:

```javascript
import { v4 as uuidv4 } from 'uuid';

uuidv4(); // ⇨ '1b9d6bcd-bbfd-4b2d-9b5d-ab8dfbbd4bed'
```

Example using predefined `random` values:

```javascript
import { v4 as uuidv4 } from 'uuid';

const v4options = {
  random: [
    0x10,
    0x91,
    0x56,
    0xbe,
    0xc4,
    0xfb,
    0xc1,
    0xea,
    0x71,
    0xb4,
    0xef,
    0xe1,
    0x67,
    0x1c,
    0x58,
    0x36,
  ],
};
uuidv4(v4options); // ⇨ '109156be-c4fb-41ea-b1b4-efe1671c5836'
```

### uuid.v5(name, namespace[, buffer[, offset]])

Create an RFC version 5 (namespace w/ SHA-1) UUID

|  |  |
| --- | --- |
| `name` | `String \| Array` |
| `namespace` | `String \| Array[16]` Namespace UUID |
| [`buffer`] | `Array \| Buffer` If specified, uuid will be written here in byte-form, starting at `offset` |
| [`offset` = 0] | `Number` Index to start writing UUID bytes in `buffer` |
| _returns_ | UUID `String` if no `buffer` is specified, otherwise returns `buffer` |

Note: The RFC `DNS` and `URL` namespaces are available as `v5.DNS` and `v5.URL`.

Example with custom namespace:

```javascript
import { v5 as uuidv5 } from 'uuid';

// Define a custom namespace.  Readers, create your own using something like
// https://www.uuidgenerator.net/
const MY_NAMESPACE = '1b671a64-40d5-491e-99b0-da01ff1f3341';

uuidv5('Hello, World!', MY_NAMESPACE); // ⇨ '630eb68f-e0fa-5ecc-887a-7c7a62614681'
```

Example with RFC `URL` namespace:

```javascript
import { v5 as uuidv5 } from 'uuid';

uuidv5('https://www.w3.org/', uuidv5.URL); // ⇨ 'c106a26a-21bb-5538-8bf2-57095d1976c1'
```

### uuid.validate(str)

Test a string to see if it is a valid UUID

|           |                                                     |
| --------- | --------------------------------------------------- |
| `str`     | `String` to validate                                |
| _returns_ | `true` if string is a valid UUID, `false` otherwise |

Example:

```javascript
import { validate as uuidValidate } from 'uuid';

uuidValidate('not a UUID'); // ⇨ false
uuidValidate('6ec0bd7f-11c0-43da-975e-2a8ad9ebae0b'); // ⇨ true
```

Using `validate` and `version` together it is possible to do per-version validation, e.g. validate for only v4 UUIds.

```javascript
import { version as uuidVersion } from 'uuid';
import { validate as uuidValidate } from 'uuid';

function uuidValidateV4(uuid) {
  return uuidValidate(uuid) && uuidVersion(uuid) === 4;
}

const v1Uuid = 'd9428888-122b-11e1-b85c-61cd3cbb3210';
const v4Uuid = '109156be-c4fb-41ea-b1b4-efe1671c5836';

uuidValidateV4(v4Uuid); // ⇨ true
uuidValidateV4(v1Uuid); // ⇨ false
```

### uuid.version(str)

Detect RFC version of a UUID

|           |                                          |
| --------- | ---------------------------------------- |
| `str`     | A valid UUID `String`                    |
| _returns_ | `Number` The RFC version of the UUID     |
| _throws_  | `TypeError` if `str` is not a valid UUID |

Example:

```javascript
import { version as uuidVersion } from 'uuid';

uuidVersion('45637ec4-c85f-11ea-87d0-0242ac130003'); // ⇨ 1
uuidVersion('6ec0bd7f-11c0-43da-975e-2a8ad9ebae0b'); // ⇨ 4
```

## Command Line

UUIDs can be generated from the command line using `uuid`.

```shell
$ uuid
ddeb27fb-d9a0-4624-be4d-4615062daed4
```

The default is to generate version 4 UUIDS, however the other versions are supported. Type `uuid --help` for details:

```shell
$ uuid --help

Usage:
  uuid
  uuid v1
  uuid v3 <name> <namespace uuid>
  uuid v4
  uuid v5 <name> <namespace uuid>
  uuid --help

Note: <namespace uuid> may be "URL" or "DNS" to use the corresponding UUIDs
defined by RFC4122
```

## ECMAScript Modules

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).

```javascript
import { v4 as uuidv4 } from 'uuid';
uuidv4(); // ⇨ '1b9d6bcd-bbfd-4b2d-9b5d-ab8dfbbd4bed'
```

To run the examples you must first create a dist build of this library in the module root:

```shell
npm run build
```

## CDN Builds

### ECMAScript Modules

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/):

```html
<script type="module">
  import { v4 as uuidv4 } from 'https://jspm.dev/uuid';
  console.log(uuidv4()); // ⇨ '1b9d6bcd-bbfd-4b2d-9b5d-ab8dfbbd4bed'
</script>
```

### UMD

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:

**Using [UNPKG](https://unpkg.com/uuid@latest/dist/umd/)**:

```html
<script src="https://unpkg.com/uuid@latest/dist/umd/uuidv4.min.js"></script>
```

**Using [jsDelivr](https://cdn.jsdelivr.net/npm/uuid@latest/dist/umd/)**:

```html
<script src="https://cdn.jsdelivr.net/npm/uuid@latest/dist/umd/uuidv4.min.js"></script>
```

**Using [cdnjs](https://cdnjs.com/libraries/uuid)**:

```html
<script src="https://cdnjs.cloudflare.com/ajax/libs/uuid/8.1.0/uuidv4.min.js"></script>
```

These CDNs all provide the same [`uuidv4()`](#uuidv4options-buffer-offset) method:

```html
<script>
  uuidv4(); // ⇨ '55af1e37-0734-46d8-b070-a1e42e4fc392'
</script>
```

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.

## "getRandomValues() not supported"

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:

### React Native / Expo

1. Install [`react-native-get-random-values`](https://github.com/LinusU/react-native-get-random-values#readme)
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:

```javascript
import 'react-native-get-random-values';
import { v4 as uuidv4 } from 'uuid';
```

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`.

### Web Workers / Service Workers (Edge <= 18)

[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).

## Upgrading From `uuid@7.x`

### Only Named Exports Supported When Using with Node.js ESM

`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.

Instead of doing:

```javascript
import uuid from 'uuid';
uuid.v4();
```

you will now have to use the named exports:

```javascript
import { v4 as uuidv4 } from 'uuid';
uuidv4();
```

### Deep Requires No Longer Supported

Deep requires like `require('uuid/v4')` [which have been deprecated in `uuid@7.x`](#deep-requires-now-deprecated) are no longer supported.

## Upgrading From `uuid@3.x`

"_Wait... what happened to `uuid@4.x` - `uuid@6.x`?!?_"

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.

### Deep Requires Now Deprecated

`uuid@3.x` encouraged the use of deep requires to minimize the bundle size of browser builds:

```javascript
const uuidv4 = require('uuid/v4'); // <== NOW DEPRECATED!
uuidv4();
```

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:

```javascript
import { v4 as uuidv4 } from 'uuid';
uuidv4();
```

... or for CommonJS:

```javascript
const { v4: uuidv4 } = require('uuid');
uuidv4();
```

### Default Export Removed

`uuid@3.x` was exporting the Version 4 UUID method as a default export:

```javascript
const uuid = require('uuid'); // <== REMOVED!
```

This usage pattern was already discouraged in `uuid@3.x` and has been removed in `uuid@7.x`.

----
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