Modified version of mongoose-shortid to remove the bignum dependency. Now it's full JS, and has no dependencies.
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README.md

mongoose-shortid-nodeps

Why this fork ?

This module was originally written by Jason Choy.

I just removed the bignum dependency to have a more light and portable module.

Original README

This plugin provides a new Schema Type, ShortId, that can be used in place of ObjectId. Typically you will want to use this instead of the default id field, but you can also use ShortId for any other field. To make sure however the ShortId is unique, you should add an index on the field. The generated IDs are random url-safe strings of configurable length, represented in a configurable base (10, 16, 32, 36, 62, 64 only).

This plugin will automatically retry inserts on a collision.

Usage

var mongoose = require('mongoose');
var ShortId = require('mongoose-shortid-nodeps');

var personSchema = mongoose.Schema({
    _id: ShortId,
    name: String
});

// or

var anotherSchema = mongoose.Schema({
    alternativeId: { type: ShortId, index: true},
    name         : String
});

Options

The default options are:

var personSchema = mongoose.Schema({
    _id: {
        type: ShortId,
        len: 7,     // Length 7 characters
        base: 64,   // Web-safe base 64 encoded string
        alphabet: undefined // Use default alphabet for base
        retries: 4  // Four retries on collision
    },
    name: String
});

Custom Alphabets

A custom alphabet can be provided using the alphabet option. This takes priority over the base argument.

var personSchema = mongoose.Schema({
    _id: {
        type: ShortId,
        len: 9,
        alphabet: 'fubar'
    }
});

The generated IDs will be 9 characters long with only the characters f u b a and r.

Custom ID Generation

A custom ID generator function can be provided by setting the generator option. This function will be called with two arguments: generatorOptions and callback.

The generatorOptions is made up from the generatorOptions object in the field options (if set), with len, base and alphabet overriden if set on the field options.

The callback function expects to be called with err and id parameters.

Here's an example:

var mongoose = require('mongoose');
var ShortId = require('mongoose-shortid-nodeps');

function customIdGenerator(options, callback) {
    var desiredLength = options.len || 7;
    var base = options.base || 64;
    var alphabet = options.alphabet || alphabetForBase(base);
    var customOption = options.customOption;

    // do Id generation
    var generatedId = ...;

    if (generatedId) {
        callback(null, generatedId);
    } else {
        callback(err);
    }
}

var exampleSchema = mongoose.Schema({
    _id: {
        type: ShortId,
        len:4,
        generator: customIdGenerator,
        generatorOptions: { customOption: 'foo' }
    },
    name: String
});

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