Nanoid port for Elixir

Elixir port of NanoID (https://github.com/ai/nanoid), a tiny, secure URL-friendly unique string ID generator.

Safe. It uses cryptographically strong random APIs and tests distribution of symbols.

Compact. It uses a larger alphabet than UUID (A-Za-z0-9_-). So ID size was reduced from 36 to 21 symbols.

Installation

The package can be installed as Hex package:

1. Add nanoid to your list of dependencies in mix.exs:

def deps do
  [{:nanoid, "~> 2.0.5"}]
end

2. Run mix deps.get to fetch the package from hex

Introducing a new generator

With version 2.0.0 of nanoid, @ai introduces a new non-secure way of creating NanoIDs. In order to keep this port close to the original, this possibility was also introduced in this port. To ensure a certain level of security, nanoid uses per default the secure token generator. But according to your preferences, if you don't need "cryptographically strong random tokens", just use the non-secure token generator.

Configuration

Starting with version 2.0.0 of nanoid for Elixir it's possible to use config.exs to configure nanoid defaults e.g. for different environments.

config :nanoid,
  size: 21,
  alphabet: "_-0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"

After changing configuration, remember to re-compile nanoid with following command:

$ mix deps.compile nanoid --force

Why re-compile? Continuously reading the configuration via Application.get_env/3 has a significant effect on the speed of nanoid. Compiling the default configuration into byte-code will eliminate the effect.

Usage

Using the "secure" (default) generator

Generate secure NanoIDs of custom size by using the default alphabet

Generate a secure NanoID with the default size of 21 characters.

iex> Nanoid.generate()
"mJUHrGXZBZpNX50x2xkzf"

Generate a secure NanoID with a custom size of 64 characters.

iex> Nanoid.generate(64)
"wk9fsUrhK9k~MxY0hLazRKpcSlic8XYDFusks7Jb8FwCVnoQaKFSPsmmLHzP7qCX"

Generate secure NanoIDs of custom size by using a custom alphabet

Generate a secure NanoID with the default size of 21 characters and an individual alphabet.

iex> Nanoid.generate(21, "abcdef123")
"d1dcd2dee333cae1bfdea"

Generate a secure NanoID with custom size of 64 characters and an individual alphabet.

iex> Nanoid.generate(64, "abcdef123")
"aabbaca3c11accca213babed2bcd1213efb3e3fa1ad23ecbf11c2ffc123f3bbe"

Using the "non-secure" generator

Generate non-secure NanoIDs of custom size by using the default alphabet

Generate a non-secure NanoID with the default size of 21 characters.

iex> Nanoid.generate_non_secure()
"YBctoD1RuZqv0DLfzDxl2"

Generate a non-secure NanoID with a custom size of 64 characters.

iex> Nanoid.generate_non_secure(64)
"D2WBHGWQOVds4YKuErmOGJ-oYfp5rik5Z-qo7kN1Dw3gv_1qQs6POmhqZdabkf8s"

Generate non-secure NanoIDs of custom size and with a custom alphabet

Generate a non-secure NanoID with the default size of 21 characters and an individual alphabet.

iex> Nanoid.generate_non_secure(21, "abcdef123")
"b12c2fac2bdbcdfcfb2da"

Generate a non-secure NanoID with custom size of 64 characters and an individual alphabet.

iex> Nanoid.generate_non_secure(64, "abcdef123")
"dfc1ed3ea22bed1c3c2df2eb21bbd33efdfae3abd3ca2abcca1efcfbf31a3b3f"

License

The MIT License (MIT). Please see License File for more information.