Fiona is a tool for creating large sets of pseudo random data. At it's core it uses a Xorshift256 PRNG that makes a mockery of creating predictable seemingly random data.
Documentation
There is more complete, better overview of the features at: https://fiona.itaccess.org.
Quickstart
The most basic use case is to generate a random number:
fiona().number({ max: 1000000, min: 0 })
// input // output
const myNumber = fiona(24).number() 553925
const age = fiona(24).number({ max: 100 }) 55
It becomes more useful when creating data structures.
// input // output
fiona(24).data({ {
age: ({ seeded }) => seeded.number({ max: 100 }), "age": 88,
name: ({ seeded }) => seeded.name(), "name": "Dr Poppy MacDonald",
iban: ({ seeded }) => seeded.regex(/[A-Z]{2}\d{2}( \d{4}){4,5} \d{1,3}/), "iban": "VR70 9829 1916 5836 9013 6470 86",
favouriteColor: ({ seeded }) => seeded.oneOf([ "favouriteColor": "yellow"
'red', }
'yellow',
'blue'
])
})
Installation
Install and import/require via npm in usual way
$ npm install fiona
... and from your app
import fiona from 'fiona' // or... `const fiona = require('fiona')`
... or from CDN
<script src='https://cdn.jsdelivr.net/npm/fiona'></script>
... or for those interested in deno - a secure runtime for JavaScript and TypeScript
import Fiona from 'http://esm.sh/fiona'