3 Simple, fast generation of [RFC4122](http://www.ietf.org/rfc/rfc4122.txt) UUIDS.
7 * Generate RFC4122 version 1 or version 4 UUIDs
8 * Runs in node.js and all browsers.
9 * Registered as a [ComponentJS](https://github.com/component/component) [component](https://github.com/component/component/wiki/Components) ('broofa/node-uuid').
10 * Cryptographically strong random # generation
11 * `crypto.randomBytes(n)` in node.js
12 * `window.crypto.getRandomValues(ta)` in [supported browsers](https://developer.mozilla.org/en-US/docs/Web/API/RandomSource/getRandomValues#Browser_Compatibility)
13 * 1.1K minified and gzip'ed (Want something smaller? Check this [crazy shit](https://gist.github.com/982883) out! )
14 * [Annotated source code](http://broofa.github.com/node-uuid/docs/uuid.html)
15 * Comes with a Command Line Interface for generating uuids on the command line
19 Install it in your browser:
22 <script src="uuid.js"></script>
32 var uuid = require('node-uuid');
35 Then create some ids ...
38 // Generate a v1 (time-based) id
39 uuid.v1(); // -> '6c84fb90-12c4-11e1-840d-7b25c5ee775a'
41 // Generate a v4 (random) id
42 uuid.v4(); // -> '110ec58a-a0f2-4ac4-8393-c866d813b8d1'
47 ### uuid.v1([`options` [, `buffer` [, `offset`]]])
49 Generate and return a RFC4122 v1 (timestamp-based) UUID.
51 * `options` - (Object) Optional uuid state to apply. Properties may include:
53 * `node` - (Array) Node id as Array of 6 bytes (per 4.1.6). Default: Randomly generated ID. See note 1.
54 * `clockseq` - (Number between 0 - 0x3fff) RFC clock sequence. Default: An internally maintained clockseq is used.
55 * `msecs` - (Number | Date) Time in milliseconds since unix Epoch. Default: The current time is used.
56 * `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.
58 * `buffer` - (Array | Buffer) Array or buffer where UUID bytes are to be written.
59 * `offset` - (Number) Starting index in `buffer` at which to begin writing.
61 Returns `buffer`, if specified, otherwise the string form of the UUID
65 1. The randomly generated node id is only 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.)
67 Example: Generate string UUID with fully-specified options
71 node: [0x01, 0x23, 0x45, 0x67, 0x89, 0xab],
73 msecs: new Date('2011-11-01').getTime(),
75 }); // -> "710b962e-041c-11e1-9234-0123456789ab"
78 Example: In-place generation of two binary IDs
81 // Generate two ids in an array
82 var arr = new Array(32); // -> []
83 uuid.v1(null, arr, 0); // -> [02 a2 ce 90 14 32 11 e1 85 58 0b 48 8e 4f c1 15]
84 uuid.v1(null, arr, 16); // -> [02 a2 ce 90 14 32 11 e1 85 58 0b 48 8e 4f c1 15 02 a3 1c b0 14 32 11 e1 85 58 0b 48 8e 4f c1 15]
86 // Optionally use uuid.unparse() to get stringify the ids
87 uuid.unparse(buffer); // -> '02a2ce90-1432-11e1-8558-0b488e4fc115'
88 uuid.unparse(buffer, 16) // -> '02a31cb0-1432-11e1-8558-0b488e4fc115'
91 ### uuid.v4([`options` [, `buffer` [, `offset`]]])
93 Generate and return a RFC4122 v4 UUID.
95 * `options` - (Object) Optional uuid state to apply. Properties may include:
97 * `random` - (Number[16]) Array of 16 numbers (0-255) to use in place of randomly generated values
98 * `rng` - (Function) Random # generator to use. Set to one of the built-in generators - `uuid.mathRNG` (all platforms), `uuid.nodeRNG` (node.js only), `uuid.whatwgRNG` (WebKit only) - or a custom function that returns an array[16] of byte values.
100 * `buffer` - (Array | Buffer) Array or buffer where UUID bytes are to be written.
101 * `offset` - (Number) Starting index in `buffer` at which to begin writing.
103 Returns `buffer`, if specified, otherwise the string form of the UUID
105 Example: Generate string UUID with fully-specified options
110 0x10, 0x91, 0x56, 0xbe, 0xc4, 0xfb, 0xc1, 0xea,
111 0x71, 0xb4, 0xef, 0xe1, 0x67, 0x1c, 0x58, 0x36
114 // -> "109156be-c4fb-41ea-b1b4-efe1671c5836"
117 Example: Generate two IDs in a single buffer
120 var buffer = new Array(32); // (or 'new Buffer' in node.js)
121 uuid.v4(null, buffer, 0);
122 uuid.v4(null, buffer, 16);
125 ### uuid.parse(id[, buffer[, offset]])
126 ### uuid.unparse(buffer[, offset])
128 Parse and unparse UUIDs
130 * `id` - (String) UUID(-like) string
131 * `buffer` - (Array | Buffer) Array or buffer where UUID bytes are to be written. Default: A new Array or Buffer is used
132 * `offset` - (Number) Starting index in `buffer` at which to begin writing. Default: 0
134 Example parsing and unparsing a UUID string
137 var bytes = uuid.parse('797ff043-11eb-11e1-80d6-510998755d10'); // -> <Buffer 79 7f f0 43 11 eb 11 e1 80 d6 51 09 98 75 5d 10>
138 var string = uuid.unparse(bytes); // -> '797ff043-11eb-11e1-80d6-510998755d10'
141 ### uuid.noConflict()
143 (Browsers only) Set `uuid` property back to it's previous value.
145 Returns the node-uuid object.
150 var myUuid = uuid.noConflict();
151 myUuid.v1(); // -> '6c84fb90-12c4-11e1-840d-7b25c5ee775a'
156 Support for the following v1.2 APIs is available in v1.3, but is deprecated and will be removed in the next major version.
158 ### uuid([format [, buffer [, offset]]])
160 uuid() has become uuid.v4(), and the `format` argument is now implicit in the `buffer` argument. (i.e. if you specify a buffer, the format is assumed to be binary).
164 The class of container created when generating binary uuid data if no buffer argument is specified. This is expected to go away, with no replacement API.
166 ## Command Line Interface
168 To use the executable, it's probably best to install this library globally.
170 `npm install -g node-uuid`
175 USAGE: uuid [version] [options]
180 --help Display this message and exit
183 `version` must be an RFC4122 version that is supported by this library, which is currently version 1 and version 4 (denoted by "v1" and "v4", respectively). `version` defaults to version 4 when not supplied.
189 3a91f950-dec8-4688-ba14-5b7bbfc7a563
194 9d0b43e0-7696-11e3-964b-250efa37a98e
199 6790ac7c-24ac-4f98-8464-42f6d98a53ae
221 npm install uuid uuid-js
222 node benchmark/benchmark.js
225 For a more complete discussion of node-uuid performance, please see the `benchmark/README.md` file, and the [benchmark wiki](https://github.com/broofa/node-uuid/wiki/Benchmark)
227 For browser performance [checkout the JSPerf tests](http://jsperf.com/node-uuid-performance).
233 * Properly detect node crypto and whatwg crypto
234 * Workaround phantomjs/browserify bug
235 * Explicit check for `window` rather implicit this-global
236 * Issue warning if Math.random() is being used
238 * A few jshint / stylistic updates (=== and such)
242 * Improved module context detection
243 * Removed public RNG functions
247 * Improve tests and handling of v1() options (Issue #24)
248 * Expose RNG option to allow for perf testing with different generators
252 * Support for version 1 ids, thanks to [@ctavan](https://github.com/ctavan)!
253 * Support for node.js crypto API
254 * De-emphasizing performance in favor of a) cryptographic quality PRNGs where available and b) more manageable code