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276 lines
7.7 KiB
Markdown
276 lines
7.7 KiB
Markdown
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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
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const uuidv1 = require('uuid/v1');
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uuidv1(); // ⇨ '2c5ea4c0-4067-11e9-8bad-9b1deb4d3b7d'
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```
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Version 3 (namespace):
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```javascript
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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); // ⇨ '9125a8dc-52ee-365b-a5aa-81b0b3681cf6'
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// ... using predefined URL namespace (for, well, URLs)
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uuidv3('http://example.com/hello', uuidv3.URL); // ⇨ 'c6235813-3ba4-3801-ae84-e0a6ebb7d138'
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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); // ⇨ 'e8b5a51d-11c8-3310-a6ab-367563f20686'
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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(); // ⇨ '1b9d6bcd-bbfd-4b2d-9b5d-ab8dfbbd4bed'
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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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//
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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); // ⇨ '630eb68f-e0fa-5ecc-887a-7c7a62614681'
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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 default [node id](https://tools.ietf.org/html/rfc4122#section-4.1.6) (the last 12 digits in the UUID) is generated once, randomly, on process startup, and then remains unchanged for the duration of the process.
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Example: Generate string UUID with fully-specified options
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```javascript
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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); // ⇨ '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();
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uuidv1(null, arr, 0); // ⇨
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// [
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// 44, 94, 164, 192, 64, 103,
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// 17, 233, 146, 52, 155, 29,
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// 235, 77, 59, 125
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// ]
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uuidv1(null, arr, 16); // ⇨
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// [
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// 44, 94, 164, 192, 64, 103, 17, 233,
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// 146, 52, 155, 29, 235, 77, 59, 125,
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// 44, 94, 164, 193, 64, 103, 17, 233,
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// 146, 52, 155, 29, 235, 77, 59, 125
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// ]
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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
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uuidv3('hello world', MY_NAMESPACE); // ⇨ '042ffd34-d989-321c-ad06-f60826172424'
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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
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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); // ⇨ '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();
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uuidv4(null, buffer, 0); // ⇨
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// [
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// 155, 29, 235, 77, 59,
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// 125, 75, 173, 155, 221,
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// 43, 13, 123, 61, 203,
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// 109
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// ]
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uuidv4(null, buffer, 16); // ⇨
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// [
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// 155, 29, 235, 77, 59, 125, 75, 173,
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// 155, 221, 43, 13, 123, 61, 203, 109,
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// 27, 157, 107, 205, 187, 253, 75, 45,
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// 155, 93, 171, 141, 251, 189, 75, 237
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// ]
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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
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uuidv5('hello world', MY_NAMESPACE); // ⇨ '9f282611-e0fd-5650-8953-89c8e342da0b'
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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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----
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Markdown generated from [README_js.md](README_js.md) by [](https://github.com/broofa/runmd) |