.. | ||
benchmark | ||
misc | ||
test | ||
.npmignore | ||
.travis.yml | ||
LICENSE.md | ||
package.json | ||
README.md | ||
rng-browser.js | ||
rng.js | ||
uuid.js |
uuid
Simple, fast generation of RFC4122 UUIDS.
Features:
- Generate RFC4122 version 1 or version 4 UUIDs
- Runs in node.js and all browsers.
- Cryptographically strong random # generation on supporting platforms
- 1185 bytes minified and gzip'ed (Want something smaller? Check this crazy shit out! )
- Annotated source code
Getting Started
Install it in your browser:
<script src="uuid.js"></script>
Or in node.js:
npm install uuid
var uuid = require('uuid');
// Generate a v1 (time-based) id
uuid.v1(); // -> '6c84fb90-12c4-11e1-840d-7b25c5ee775a'
// Generate a v4 (random) id
uuid.v4(); // -> '110ec58a-a0f2-4ac4-8393-c866d813b8d1'
API
uuid.v1([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 | Date) Time in milliseconds since unix Epoch. Default: The current time is used.nsecs
- (Number between 0-9999) additional time, in 100-nanosecond units. Ignored ifmsecs
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 inbuffer
at which to begin writing.
Returns buffer
, if specified, otherwise the string form of the UUID
Notes:
- 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.)
Example: Generate string UUID with fully-specified options
uuid.v1({
node: [0x01, 0x23, 0x45, 0x67, 0x89, 0xab],
clockseq: 0x1234,
msecs: new Date('2011-11-01').getTime(),
nsecs: 5678
}); // -> "710b962e-041c-11e1-9234-0123456789ab"
Example: In-place generation of two binary IDs
// Generate two ids in an array
var arr = new Array(32); // -> []
uuid.v1(null, arr, 0); // -> [02 a2 ce 90 14 32 11 e1 85 58 0b 48 8e 4f c1 15]
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]
// Optionally use uuid.unparse() to get stringify the ids
uuid.unparse(buffer); // -> '02a2ce90-1432-11e1-8558-0b488e4fc115'
uuid.unparse(buffer, 16) // -> '02a31cb0-1432-11e1-8558-0b488e4fc115'
uuid.v4([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 valuesrng
- (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.
-
buffer
- (Array | Buffer) Array or buffer where UUID bytes are to be written. -
offset
- (Number) Starting index inbuffer
at which to begin writing.
Returns buffer
, if specified, otherwise the string form of the UUID
Example: Generate string UUID with fully-specified options
uuid.v4({
random: [
0x10, 0x91, 0x56, 0xbe, 0xc4, 0xfb, 0xc1, 0xea,
0x71, 0xb4, 0xef, 0xe1, 0x67, 0x1c, 0x58, 0x36
]
});
// -> "109156be-c4fb-41ea-b1b4-efe1671c5836"
Example: Generate two IDs in a single buffer
var buffer = new Array(32); // (or 'new Buffer' in node.js)
uuid.v4(null, buffer, 0);
uuid.v4(null, buffer, 16);
uuid.parse(id[, buffer[, offset]])
uuid.unparse(buffer[, offset])
Parse and unparse UUIDs
id
- (String) UUID(-like) stringbuffer
- (Array | Buffer) Array or buffer where UUID bytes are to be written. Default: A new Array or Buffer is usedoffset
- (Number) Starting index inbuffer
at which to begin writing. Default: 0
Example parsing and unparsing a UUID string
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>
var string = uuid.unparse(bytes); // -> '797ff043-11eb-11e1-80d6-510998755d10'
uuid.noConflict()
(Browsers only) Set uuid
property back to it's previous value.
Returns the uuid object.
Example:
var myUuid = uuid.noConflict();
myUuid.v1(); // -> '6c84fb90-12c4-11e1-840d-7b25c5ee775a'
Deprecated APIs
Support for the following v1.2 APIs is available in v1.3, but is deprecated and will be removed in the next major version.
uuid([format [, buffer [, offset]]])
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).
Testing
In node.js
> cd test
> node test.js
In Browser
open test/test.html
Benchmarking
Requires node.js
cd benchmark/
npm install
node benchmark.js
For a more complete discussion of uuid performance, please see the benchmark/README.md
file, and the benchmark wiki
For browser performance checkout the JSPerf tests.
Release notes
2.0.0
- Removed uuid.BufferClass
1.4.0
- Improved module context detection
- Removed public RNG functions
1.3.2
- Improve tests and handling of v1() options (Issue #24)
- Expose RNG option to allow for perf testing with different generators
1.3.0
- Support for version 1 ids, thanks to @ctavan!
- Support for node.js crypto API
- De-emphasizing performance in favor of a) cryptographic quality PRNGs where available and b) more manageable code