228 lines
6.3 KiB
Markdown
228 lines
6.3 KiB
Markdown
# uuid [](http://travis-ci.org/kelektiv/node-uuid) #
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Simple, fast generation of [RFC4122](http://www.ietf.org/rfc/rfc4122.txt) UUIDS.
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Features:
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* Support for version 1, 4 and 5 UUIDs
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* Cross-platform
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* Uses cryptographically-strong random number APIs (when available)
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* Zero-dependency, small footprint (... but not [this small](https://gist.github.com/982883))
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## Quickstart - CommonJS (Recommended)
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```shell
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npm install uuid
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```
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Then generate your uuid version of choice ...
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Version 1 (timestamp):
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```javascript
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const uuidv1 = require('uuid/v1');
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uuidv1(); // -> '6c84fb90-12c4-11e1-840d-7b25c5ee775a'
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```
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Version 4 (random):
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```javascript
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const uuidv4 = require('uuid/v4');
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uuidv4(); // -> '110ec58a-a0f2-4ac4-8393-c866d813b8d1'
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```
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Version 5 (namespace):
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```javascript
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const uuidv5 = require('uuid/v5');
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// ... using predefined DNS namespace (for domain names)
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uuidv5('hello.example.com', uuidv5.DNS)); // -> 'fdda765f-fc57-5604-a269-52a7df8164ec'
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// ... using predefined URL namespace (for, well, URLs)
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uuidv5('http://example.com/hello', uuidv5.URL); // -> '3bbcee75-cecc-5b56-8031-b6641c1ed1f1'
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// ... using a custom namespace
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const MY_NAMESPACE = '<UUID string you previously generated elsewhere>';
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uuidv5('Hello, World!', MY_NAMESPACE); // -> '90123e1c-7512-523e-bb28-76fab9f2f73d'
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```
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## Quickstart - Browser-ready Versions
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Browser-ready versions of this module are available via [wzrd.in](https://github.com/jfhbrook/wzrd.in).
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For version 1 uuids:
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```html
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<script src="http://wzrd.in/standalone/uuid%2Fv1@latest"></script>
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<script>
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uuidv1(); // -> v1 UUID
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</script>
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```
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For version 4 uuids:
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```html
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<script src="http://wzrd.in/standalone/uuid%2Fv4@latest"></script>
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<script>
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uuidv4(); // -> v4 UUID
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</script>
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```
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For version 5 uuids:
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```html
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<script src="http://wzrd.in/standalone/uuid%2Fv5@latest"></script>
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<script>
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uuidv5('http://example.com/hello', uuidv5.URL); // -> v5 UUID
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</script>
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```
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## API
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### Version 1
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```javascript
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const uuidv1 = require('uuid/v1');
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// Allowed arguments
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uuidv1();
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uuidv1(options);
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uuidv1(options, buffer, offset);
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```
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Generate and return a RFC4122 v1 (timestamp-based) UUID.
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* `options` - (Object) Optional uuid state to apply. Properties may include:
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* `node` - (Array) Node id as Array of 6 bytes (per 4.1.6). Default: Randomly generated ID. See note 1.
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* `clockseq` - (Number between 0 - 0x3fff) RFC clock sequence. Default: An internally maintained clockseq is used.
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* `msecs` - (Number | Date) Time in milliseconds since unix Epoch. Default: The current time is used.
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* `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.
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* `buffer` - (Array | Buffer) Array or buffer where UUID bytes are to be written.
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* `offset` - (Number) Starting index in `buffer` at which to begin writing.
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Returns `buffer`, if specified, otherwise the string form of the UUID
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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.)
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Example: Generate string UUID with fully-specified options
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```javascript
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uuidv1({
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node: [0x01, 0x23, 0x45, 0x67, 0x89, 0xab],
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clockseq: 0x1234,
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msecs: new Date('2011-11-01').getTime(),
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nsecs: 5678
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}); // -> "710b962e-041c-11e1-9234-0123456789ab"
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```
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Example: In-place generation of two binary IDs
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```javascript
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// Generate two ids in an array
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const arr = new Array(32); // -> []
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uuidv1(null, arr, 0); // -> [02 a2 ce 90 14 32 11 e1 85 58 0b 48 8e 4f c1 15]
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uuidv1(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]
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```
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### Version 4
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```javascript
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const uuidv4 = require('uuid/v4')
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// Allowed arguments
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uuidv4();
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uuidv4(options);
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uuidv4(options, buffer, offset);
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```
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Generate and return a RFC4122 v4 UUID.
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* `options` - (Object) Optional uuid state to apply. Properties may include:
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* `random` - (Number[16]) Array of 16 numbers (0-255) to use in place of randomly generated values
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* `rng` - (Function) Random # generator function that returns an Array[16] of byte values (0-255)
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* `buffer` - (Array | Buffer) Array or buffer where UUID bytes are to be written.
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* `offset` - (Number) Starting index in `buffer` at which to begin writing.
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Returns `buffer`, if specified, otherwise the string form of the UUID
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Example: Generate string UUID with fully-specified options
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```javascript
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uuid.v4({
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random: [
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0x10, 0x91, 0x56, 0xbe, 0xc4, 0xfb, 0xc1, 0xea,
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0x71, 0xb4, 0xef, 0xe1, 0x67, 0x1c, 0x58, 0x36
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]
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});
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// -> "109156be-c4fb-41ea-b1b4-efe1671c5836"
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```
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Example: Generate two IDs in a single buffer
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```javascript
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const buffer = new Array(32); // (or 'new Buffer' in node.js)
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uuid.v4(null, buffer, 0);
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uuid.v4(null, buffer, 16);
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```
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### Version 5
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```javascript
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const uuidv5 = require('uuid/v4');
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// Allowed arguments
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uuidv5(name, namespace);
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uuidv5(name, namespace, buffer);
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uuidv5(name, namespace, buffer, offset);
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```
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Generate and return a RFC4122 v4 UUID.
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* `name` - (String | Array[]) "name" to create UUID with
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* `namespace` - (String | Array[]) "namespace" UUID either as a String or Array[16] of byte values
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* `buffer` - (Array | Buffer) Array or buffer where UUID bytes are to be written.
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* `offset` - (Number) Starting index in `buffer` at which to begin writing. Default = 0
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Returns `buffer`, if specified, otherwise the string form of the UUID
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Example:
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```javascript
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// Generate a unique namespace (typically you would do this once, outside of
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// your project, then bake this value into your code)
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const uuidv4 = require('uuid/v4');
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const MY_NAMESPACE = uuidv4(); //
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// Generate a couple namespace uuids
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const uuidv5 = require('uuid/v5');
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uuidv5('hello', MY_NAMESPACE);
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uuidv5('world', MY_NAMESPACE);
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```
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## Testing
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```shell
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npm test
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```
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## Deprecated / Browser-ready API
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The API below is available for legacy purposes and is not expected to be available post-3.X
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```javascript
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const uuid = require('uuid');
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uuid.v1(...); // alias of uuid/v1
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uuid.v4(...); // alias of uuid/v4
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uuid(...); // alias of uuid/v4
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// uuid.v5() is not supported in this API
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```
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## Legacy node-uuid package
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The code for the legacy node-uuid package is available in the `node-uuid` branch.
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