A Node.js utility to fetch genuine random bytes from the HotBits API service.

import hotbits from 'hotbits';

const API_KEY = // Your hotbits api key

hotbits(API_KEY).then(result => {
     // result will be an array of random bytes as an integers 0-255
     // such as [23, 72, 190, 37, 11, 227, 130, 150, 56, 110]
  })

Background

In some situations psuedorandom random numbers may not be adequate. HotBits generates genuine random numbers by timing successive pairs of radioactive decays detected by a Geiger-Müller tube interfaced to a computer.

Installation

npm install hotbits

Usage

API Key

Pass your api key into the hotbits function as the first parameter.

hotbits('HB10usUsPFyJzKs84zYML85sbBY')

To get genuine random bytes you will need to obtain an api key from hotbits here.

For development and testing you can use Pseudorandom for the api key to receive pseudorandom bytes from the service.

hotbits('Pseudorandom')

To keep your api key out of your source code use an environment variable like this

hotbits(process.env.HOTBITS_KEY)

Options

hotbits(API_KEY, { number: 100})

Pass an object as the optional second parameter with a property for each option you want to specify. Currently the only option is number which specifies how many random bytes you want in the result. The maximum allowed is 2048. If the number option is not specified 10 results are returned.

Return Value

Calling hotbits returns a promise and initiates a call to the api at https://www.fourmilab.ch/cgi-bin/Hotbits.api. Upon a successful reply the promise resolves to an array with the random bytes requested. The bytes are integers ranging from 0 to 255. On error the promise rejects with the error.

Errors

Reasons that the returned promise will reject with an error include:

• Unable to connect to the api server
• An error returned from the server
• An unexpected response from the server
• Invalid parameters