281 lines
7.4 KiB
Markdown
281 lines
7.4 KiB
Markdown
```javascript --hide
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runmd.onRequire = path => path.replace(/^uuid/, './');
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```
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# 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, 3, 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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[**Deprecation warning**: The use of `require('uuid')` is deprecated and will not be
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supported after version 3.x of this module. Instead, use `require('uuid/[v1|v3|v4|v5]')` as shown in the examples below.]
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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 --run v1
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const uuidv1 = require('uuid/v1');
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uuidv1(); // RESULT
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```
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Version 3 (namespace):
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```javascript --run v3
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const uuidv3 = require('uuid/v3');
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// ... using predefined DNS namespace (for domain names)
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uuidv3('hello.example.com', uuidv3.DNS); // RESULT
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// ... using predefined URL namespace (for, well, URLs)
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uuidv3('http://example.com/hello', uuidv3.URL); // RESULT
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// ... using a custom namespace
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//
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// Note: Custom namespaces should be a UUID string specific to your application!
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// E.g. the one here was generated using this modules `uuid` CLI.
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const MY_NAMESPACE = '1b671a64-40d5-491e-99b0-da01ff1f3341';
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uuidv3('Hello, World!', MY_NAMESPACE); // RESULT
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```
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Version 4 (random):
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```javascript --run v4
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const uuidv4 = require('uuid/v4');
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uuidv4(); // RESULT
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```
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Version 5 (namespace):
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```javascript --run v5
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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); // RESULT
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// ... using predefined URL namespace (for, well, URLs)
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uuidv5('http://example.com/hello', uuidv5.URL); // RESULT
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// ... using a custom namespace
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//
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// Note: Custom namespaces should be a UUID string specific to your application!
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// E.g. the one here was generated using this modules `uuid` CLI.
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const MY_NAMESPACE = '1b671a64-40d5-491e-99b0-da01ff1f3341';
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uuidv5('Hello, World!', MY_NAMESPACE); // RESULT
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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 3 uuids:
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```html
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<script src="http://wzrd.in/standalone/uuid%2Fv3@latest"></script>
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<script>
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uuidv3('http://example.com/hello', uuidv3.URL); // -> v3 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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// Incantations
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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) 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 --run v1
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const v1options = {
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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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};
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uuidv1(v1options); // RESULT
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```
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Example: In-place generation of two binary IDs
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```javascript --run v1
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// Generate two ids in an array
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const arr = new Array();
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uuidv1(null, arr, 0); // RESULT
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uuidv1(null, arr, 16); // RESULT
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```
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### Version 3
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```javascript
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const uuidv3 = require('uuid/v3');
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// Incantations
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uuidv3(name, namespace);
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uuidv3(name, namespace, buffer);
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uuidv3(name, namespace, buffer, offset);
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```
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Generate and return a RFC4122 v3 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 --run v3
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uuidv3('hello world', MY_NAMESPACE); // RESULT
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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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// Incantations
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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 predefined `random` values
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```javascript --run v4
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const v4options = {
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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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uuidv4(v4options); // RESULT
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```
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Example: Generate two IDs in a single buffer
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```javascript --run v4
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const buffer = new Array();
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uuidv4(null, buffer, 0); // RESULT
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uuidv4(null, buffer, 16); // RESULT
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```
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### Version 5
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```javascript
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const uuidv5 = require('uuid/v5');
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// Incantations
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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 v5 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 --run v5
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uuidv5('hello world', MY_NAMESPACE); // RESULT
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```
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## Command Line
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UUIDs can be generated from the command line with the `uuid` command.
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```shell
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$ uuid
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ddeb27fb-d9a0-4624-be4d-4615062daed4
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$ uuid v1
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02d37060-d446-11e7-a9fa-7bdae751ebe1
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```
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Type `uuid --help` for usage details
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## Testing
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```shell
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npm test
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```
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