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Simple, fast generation of RFC4122 UUIDS.


Getting Started

Install it in your browser:

<script src="uuid.js"></script>

Or in node.js:

npm install node-uuid
var uuid = require('node-uuid');

Then create some ids ...

// 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'


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

Generate and return a RFC4122 v1 (timestamp-based) UUID.

Returns buffer, if specified, otherwise the string form of the UUID


  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.)

Example: Generate string UUID with fully-specified options

  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.

Returns buffer, if specified, otherwise the string form of the UUID

Example: Generate string UUID with fully-specified options

  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

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'


(Browsers only) Set uuid property back to it's previous value.

Returns the node-uuid object.


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).


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.

Command Line Interface

To use the executable, it's probably best to install this library globally.

npm install -g node-uuid


USAGE: uuid [version] [options]


--help                     Display this message and exit

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.


> uuid
> uuid v1
> uuid v4


In node.js

npm test

In Browser

open test/test.html


Requires node.js

npm install uuid uuid-js
node benchmark/benchmark.js

For a more complete discussion of node-uuid performance, please see the benchmark/README.md file, and the benchmark wiki

For browser performance checkout the JSPerf tests.

Release notes