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<!-- -- This file is auto-generated from README_js.md. Changes should be made there. --> # uuid [![Build Status](https://secure.travis-ci.org/kelektiv/node-uuid.svg?branch=master)](http://travis-ci.org/kelektiv/node-uuid) # Simple, fast generation of [RFC4122](http://www.ietf.org/rfc/rfc4122.txt) UUIDS. Features: * Support for version 1, 3, 4 and 5 UUIDs * Cross-platform * Uses cryptographically-strong random number APIs (when available) * Zero-dependency, small footprint (... but not [this small](https://gist.github.com/982883)) [**Deprecation warning**: The use of `require('uuid')` is deprecated and will not be supported after version 3.x of this module. Instead, use `require('uuid/[v1|v3|v4|v5]')` as shown in the examples below.] ## Quickstart - CommonJS (Recommended) ```shell npm install uuid ``` Then generate your uuid version of choice ... Version 1 (timestamp): ```javascript const uuidv1 = require('uuid/v1'); uuidv1(); // ⇨ '45745c60-7b1a-11e8-9c9c-2d42b21b1a3e' ``` Version 3 (namespace): ```javascript const uuidv3 = require('uuid/v3'); // ... using predefined DNS namespace (for domain names) uuidv3('hello.example.com', uuidv3.DNS); // ⇨ '9125a8dc-52ee-365b-a5aa-81b0b3681cf6' // ... using predefined URL namespace (for, well, URLs) uuidv3('http://example.com/hello', uuidv3.URL); // ⇨ 'c6235813-3ba4-3801-ae84-e0a6ebb7d138' // ... using a custom namespace // // Note: Custom namespaces should be a UUID string specific to your application! // E.g. the one here was generated using this modules `uuid` CLI. const MY_NAMESPACE = '1b671a64-40d5-491e-99b0-da01ff1f3341'; uuidv3('Hello, World!', MY_NAMESPACE); // ⇨ 'e8b5a51d-11c8-3310-a6ab-367563f20686' ``` Version 4 (random): ```javascript const uuidv4 = require('uuid/v4'); uuidv4(); // ⇨ '10ba038e-48da-487b-96e8-8d3b99b6d18a' ``` Version 5 (namespace): ```javascript const uuidv5 = require('uuid/v5'); // ... using predefined DNS namespace (for domain names) uuidv5('hello.example.com', uuidv5.DNS); // ⇨ 'fdda765f-fc57-5604-a269-52a7df8164ec' // ... using predefined URL namespace (for, well, URLs) uuidv5('http://example.com/hello', uuidv5.URL); // ⇨ '3bbcee75-cecc-5b56-8031-b6641c1ed1f1' // ... using a custom namespace // // Note: Custom namespaces should be a UUID string specific to your application! // E.g. the one here was generated using this modules `uuid` CLI. const MY_NAMESPACE = '1b671a64-40d5-491e-99b0-da01ff1f3341'; uuidv5('Hello, World!', MY_NAMESPACE); // ⇨ '630eb68f-e0fa-5ecc-887a-7c7a62614681' ``` ## Quickstart - Browser-ready Versions Browser-ready versions of this module are available via [wzrd.in](https://github.com/jfhbrook/wzrd.in). For version 1 uuids: ```html <script src="http://wzrd.in/standalone/uuid%2Fv1@latest"></script> <script> uuidv1(); // -> v1 UUID </script> ``` For version 3 uuids: ```html <script src="http://wzrd.in/standalone/uuid%2Fv3@latest"></script> <script> uuidv3('http://example.com/hello', uuidv3.URL); // -> v3 UUID </script> ``` For version 4 uuids: ```html <script src="http://wzrd.in/standalone/uuid%2Fv4@latest"></script> <script> uuidv4(); // -> v4 UUID </script> ``` For version 5 uuids: ```html <script src="http://wzrd.in/standalone/uuid%2Fv5@latest"></script> <script> uuidv5('http://example.com/hello', uuidv5.URL); // -> v5 UUID </script> ``` ## API ### Version 1 ```javascript const uuidv1 = require('uuid/v1'); // Incantations uuidv1(); uuidv1(options); uuidv1(options, buffer, offset); ``` Generate and return a RFC4122 v1 (timestamp-based) UUID. * `options` - (Object) Optional uuid state to apply. Properties may include: * `node` - (Array) Node id as Array of 6 bytes (per 4.1.6). Default: Randomly generated ID. See note 1. * `clockseq` - (Number between 0 - 0x3fff) RFC clock sequence. Default: An internally maintained clockseq is used. * `msecs` - (Number) Time in milliseconds since unix Epoch. Default: The current time is used. * `nsecs` - (Number between 0-9999) additional time, in 100-nanosecond units. Ignored if `msecs` is unspecified. Default: internal uuid counter is used, as per 4.2.1.2. * `buffer` - (Array | Buffer) Array or buffer where UUID bytes are to be written. * `offset` - (Number) Starting index in `buffer` at which to begin writing. Returns `buffer`, if specified, otherwise the string form of the UUID Note: The <node> id is generated guaranteed to stay constant for the lifetime of the current JS runtime. (Future versions of this module may use persistent storage mechanisms to extend this guarantee.) Example: Generate string UUID with fully-specified options ```javascript 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' ``` Example: In-place generation of two binary IDs ```javascript // Generate two ids in an array const arr = new Array(); uuidv1(null, arr, 0); // ⇨ [ 69, 117, 109, 208, 123, 26, 17, 232, 146, 52, 45, 66, 178, 27, 26, 62 ] uuidv1(null, arr, 16); // ⇨ [ 69, 117, 109, 208, 123, 26, 17, 232, 146, 52, 45, 66, 178, 27, 26, 62, 69, 117, 109, 209, 123, 26, 17, 232, 146, 52, 45, 66, 178, 27, 26, 62 ] ``` ### Version 3 ```javascript const uuidv3 = require('uuid/v3'); // Incantations uuidv3(name, namespace); uuidv3(name, namespace, buffer); uuidv3(name, namespace, buffer, offset); ``` Generate and return a RFC4122 v3 UUID. * `name` - (String | Array[]) "name" to create UUID with * `namespace` - (String | Array[]) "namespace" UUID either as a String or Array[16] of byte values * `buffer` - (Array | Buffer) Array or buffer where UUID bytes are to be written. * `offset` - (Number) Starting index in `buffer` at which to begin writing. Default = 0 Returns `buffer`, if specified, otherwise the string form of the UUID Example: ```javascript uuidv3('hello world', MY_NAMESPACE); // ⇨ '042ffd34-d989-321c-ad06-f60826172424' ``` ### Version 4 ```javascript const uuidv4 = require('uuid/v4') // Incantations uuidv4(); uuidv4(options); uuidv4(options, buffer, offset); ``` Generate and return a RFC4122 v4 UUID. * `options` - (Object) Optional uuid state to apply. Properties may include: * `random` - (Number[16]) Array of 16 numbers (0-255) to use in place of randomly generated values * `rng` - (Function) Random # generator function that returns an Array[16] of byte values (0-255) * `buffer` - (Array | Buffer) Array or buffer where UUID bytes are to be written. * `offset` - (Number) Starting index in `buffer` at which to begin writing. Returns `buffer`, if specified, otherwise the string form of the UUID Example: Generate string UUID with predefined `random` values ```javascript 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' ``` Example: Generate two IDs in a single buffer ```javascript const buffer = new Array(); uuidv4(null, buffer, 0); // ⇨ [ 54, 122, 218, 70, 45, 70, 65, 24, 171, 53, 95, 130, 83, 195, 242, 45 ] uuidv4(null, buffer, 16); // ⇨ [ 54, 122, 218, 70, 45, 70, 65, 24, 171, 53, 95, 130, 83, 195, 242, 45, 108, 204, 255, 103, 171, 86, 76, 94, 178, 225, 188, 236, 150, 20, 151, 87 ] ``` ### Version 5 ```javascript const uuidv5 = require('uuid/v5'); // Incantations uuidv5(name, namespace); uuidv5(name, namespace, buffer); uuidv5(name, namespace, buffer, offset); ``` Generate and return a RFC4122 v5 UUID. * `name` - (String | Array[]) "name" to create UUID with * `namespace` - (String | Array[]) "namespace" UUID either as a String or Array[16] of byte values * `buffer` - (Array | Buffer) Array or buffer where UUID bytes are to be written. * `offset` - (Number) Starting index in `buffer` at which to begin writing. Default = 0 Returns `buffer`, if specified, otherwise the string form of the UUID Example: ```javascript uuidv5('hello world', MY_NAMESPACE); // ⇨ '9f282611-e0fd-5650-8953-89c8e342da0b' ``` ## Command Line UUIDs can be generated from the command line with the `uuid` command. ```shell $ uuid ddeb27fb-d9a0-4624-be4d-4615062daed4 $ uuid v1 02d37060-d446-11e7-a9fa-7bdae751ebe1 ``` Type `uuid --help` for usage details ## Testing ```shell npm test ``` ---- Markdown generated from [README_js.md](README_js.md) by [![RunMD Logo](http://i.imgur.com/h0FVyzU.png)](https://github.com/broofa/runmd)