Ranture is a library to create custom structured mock data in seconds. When I made mock data, biggest difficulty was about random lengthed arrays. Ranture can set up a random iterations with one sentence, hierarchical structures, nested arrays, etc. It uses property names as arguments to have a cleaner syntax:

import { ranture, random, RantureArray } from "./ranture.js"


let pets = ['cat', 'dog', 'fish']
let places = ['europe', 'asia', 'america', 'africa', 'australia', 'antarctica']

pets = new RantureArray(...pets)
places = new RantureArray(...places)

let mock = ranture({
	"pets from 7 to 22 step 7 salt 5 ": lifespan => ({
		pet: pets.single,
		lifespan,
		found: places.min(1).max(4)
	})
})

console.log(JSON.stringify(mock, 0, 2))

Pets with lifespans from little to much.

The first word before space is actual property's name. Followed by key value fashioned arguments:

Loop Keywords

• from iterator starts from this
• min iterator starts from a random number greater than (>=) this
• to iterator goes up to this
• max iterator goes up to a random number less than (<=) this
• salt maximum ± random number to add to the iterator every run
• step every iteration iterator increased by this value

RantureArray

• .single returns a random element
• .shuffled returns its shuflled version
• .repeatable returns its shuffled version that can has duplicates
• .sample(n) returns a sample from it with n numbers of elements
• .min(n) returns random sample with length greater than n
• .max(n) returns random sample with length less than n

To use .min(a) and .max(b) both, you should write them in .min(a).max(b) fashion since .max(b) may return an array with length lower than a but .min(a) leaves a mark for .max(b) if they're in row.

Result of the code snippet above (every run will probably be different)

{
  "pets": [
    {
      "pet": "cat",
      "lifespan": 8,
      "found": [
        "asia"
      ]
    },
    {
      "pet": "dog",
      "lifespan": 17,
      "found": [
        "africa"
      ]
    },
    {
      "pet": "dog",
      "lifespan": 22,
      "found": [
        "australia",
        "europe",
      ]
    }
  ]
}