shortid32

shortid32  

> Amazingly short non-sequential human-friendly unique id generator.

ShortId32 creates amazingly short non-sequential human-friendly unique ids. Perfect for url shorteners, and any other id users might see.

* By default 7-14 human-friendly characters: A-Z, 0-9, excluding the commonly confused 01OI
* Non-sequential so they are not predictable.
* Supports cluster (automatically), custom seeds, custom alphabet.
* Can generate any number of ids without duplicates, even millions per day.
* Perfect for games, especially if you are concerned about cheating so you don't want an easily guessable id.
* Apps can be restarted any number of times without any chance of repeating an id.
* Works in Node, io.js, and web browsers.
* Includes Mocha tests.

$3

``js
var shortid = require('shortid32');

console.log(shortid.generate());
//PPBQWA9
`

$3

The best way to use shortid32 in the browser is via browserify or webpack.

These tools will automatically only include the files necessary for browser compatibility.

All tests will run in the browser as well:

`bash


build the bundle, then open Mocha in a browser to see the tests run.


$ grunt build open
`

$3

`js
~/projects/shortid ❯ node examples/examples.js
WKTQBXJF
QKCTWBXJF
WKZVQMXJP
Q3ATWB5CF
QK5VQMXCP
WKQVQMXJF
Q3FTQB5CP
WK6VWM5JF
QKGTWBXCF
W3TVWBXJP
`

$3

var shortid = require('shortid32');

---------------------------------------

#### shortid.generate()

__Returns__ string non-sequential unique id.

__Example__

`js
users.insert({
_id: shortid.generate()
name: ...
email: ...
});
`

---------------------------------------

#### characters(string)

__Default:__ '23456789ABCDEFGHJKLMNPQRSTUVWXYZ'

__Returns__ new alphabet as a string

__Optional__

Change the characters used.

You must provide a string of all 32 unique characters. Order is not important.

The default characters provided were selected because they are human friendly.

__Example__

`js
// any 32 unicode characters work, but I wouldn't recommend this.
shortid.characters('ⒶⒷⒸⒹⒺⒻⒼⒽⒿⓀⓁⓂⓃⓅⓆⓇⓈⓉⓊⓋⓌⓍⓎⓏ②③④⑤⑥⑦⑧⑨');
`

---------------------------------------

#### isValid(id)

__Returns__ boolean

Check to see if an id is a valid shortid. Note: This only means the id _could_ have been generated by shortid, it doesn't guarantee it.

__Example__

`js
shortid.isValid('43XTDBE');
// true
`

`js
shortid.isValid('i have spaces');
// false
`

---------------------------------------

#### shortid.worker(integer)

__Default:__ process.env.NODE_UNIQUE_ID || 0

__Recommendation:__ You typically won't want to change this.

__Optional__

If you are running multiple server processes then you should make sure every one has a unique worker id. Should be an integer between 0 and 16.
If you do not do this there is very little chance of two servers generating the same id, but it is theatrically possible
if both are generated in the exact same second and are generating the same number of ids that second and a half-dozen random numbers are all exactly the same.

__Example__

`js
shortId.seed(1000);
`

---------------------------------------

#### shortid.seed(float)

__Default:__ 1

__Recommendation:__ You typically won't want to change this.

__Optional__

Choose a unique value that will seed the random number generator so users won't be able to figure out the pattern of the unique ids. Call it just once in your application before using shortId and always use the same value in your application.

Most developers won't need to use this, it's mainly for testing ShortId.

If you are worried about users somehow decrypting the id then use it as a secret value for increased encryption.

__Example__

`js
shortId.seed(1000);
`

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This is a modification of shortid`. The original author of that software is Dylan Greene.

$3

Copyright (c) 2015 Dylan Greene, contributors.

Released under the MIT license.

Screenshots are CC BY-SA (Attribution-ShareAlike).