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shortid

Amazingly short non-sequential url-friendly unique id generator.

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

By default 7-14 url-friendly characters: A-Z, a-z, 0-9, _-
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.
Popular replacement for Mongo ID/Mongoose ID.
Works in Node, io.js, and web browsers.
Includes Mocha tests.

Usage

var shortid = require('shortid');

console.log(shortid.generate());
//PPBqWA9

Mongoose Unique Id

_id: {
    type: String,
    unique: true,
    'default': shortid.generate
},

Browser Compatibility

The best way to use shortid 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:

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

Example

~/projects/shortid ❯ node examples/examples.js
eWRhpRV
23TplPdS
46Juzcyx
dBvJIh-H
2WEKaVNO
7oet_d9Z
dogPzIz8
nYrnfYEv
a4vhAoFG
hwX6aOr7

Real World Examples

shortId was created for Node Knockout 2011 winner for Most Fun Doodle Or Die. Millions of doodles have been saved with shortId filenames. Every log message gets a shortId to make it easy for us to look up later.

Here are some other projects that use shortId:

bevy - A simple server to manage multiple Node services.
capre - Cross-Server Data Replication.
cordova-build - an alternative to phonegap build that runs on your servers/agents.
couchdb-tools - A library of handy functions for use when working with CouchDB documents.
CleverStack/clever-email - E-mail system for CleverStack.
CloudTypes - JavaScript end2end implementation of the Cloud Types model for Eventual Consistency programming.
dnode-tarantula - an asynchronous rpc and event system for node.js based on dnode-protocol and TCP sockets.
mongoose-url-shortener - A simple URL Shortening library for NodeJS using Promises/A+ results.
mozilla/smokejumper - The Smoke Jumper project is an effort to bring dead simple, secure, P2P file sharing to Firefox.
shortness - Node based URL shortener that uses SQLite.
file-db - Document database that uses directories and files to store its data, supporting nested key-value objects in named collections.
resume-generator - Resume Generator.
riffmint - Collaboration in musical space.
rap1ds/dippa - Dippa Editor – A web-based LaTeX editor

API

var shortid = require('shortid');

`shortid.generate()`

Returns string non-sequential unique id.

Example

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

`characters(string)`

Default: '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_'

Returns new alphabet as a string

Recommendation: If you don't like _ or -, you can to set new characters to use.

Optional

Change the characters used.

You must provide a string of all 64 unique characters. Order is not important.

The default characters provided were selected because they are url safe.

Example

// use $ and @ instead of - and _
shortid.characters('0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$@');

// any 64 unicode characters work, but I wouldn't recommend this.
shortid.characters('ⒶⒷⒸⒹⒺⒻⒼⒽⒾⒿⓀⓁⓂⓃⓄⓅⓆⓇⓈⓉⓊⓋⓌⓍⓎⓏⓐⓑⓒⓓⓔⓕⓖⓗⓘⓙⓚⓛⓜⓝⓞⓟⓠⓡⓢⓣⓤⓥⓦⓧⓨⓩ①②③④⑤⑥⑦⑧⑨⑩⑪⑫');

`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

shortid.isValid('41XTDbE');
// true

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

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

shortId.seed(1000);

About the Author

Hi! Thanks for checking out this project! My name is Dylan Greene. When not overwhelmed with my two young kids I enjoy contributing to the open source community. I'm also a tech lead at Opower.

Here's some of my other Node projects:

Name	Description	npm Downloads
`grunt‑notify`	Automatic desktop notifications for Grunt errors and warnings using Growl for OS X or Windows, Mountain Lion and Mavericks Notification Center, and Notify-Send.
`npm‑check`	Check for outdated, incorrect, and unused dependencies.
`grunt‑prompt`	Interactive prompt for your Grunt config using console checkboxes, text input with filtering, password fields.
`rss`	RSS feed generator. Add RSS feeds to any project. Supports enclosures and GeoRSS.
`xml`	Fast and simple xml generator. Supports attributes, CDATA, etc. Includes tests and examples.
`changelog`	Command line tool (and Node module) that generates a changelog in color output, markdown, or json for modules in npmjs.org's registry as well as any public github.com repo.
`grunt‑attention`	Display attention-grabbing messages in the terminal
`observatory`	Beautiful UI for showing tasks running on the command line.
`anthology`	Module information and stats for any @npmjs user
`grunt‑cat`	Echo a file to the terminal. Works with text, figlets, ascii art, and full-color ansi.