Setup

npm install gtin-manager
// or
yarn add gtin-manager

Usage

Create a generator instance using a GCP (Global Company Prefix) provided by GS1.

import Manager from 'gtin-manager'

const manager = new Manager('12345678')

manager.contingent

Returns the amount of possible GTINs that can be created from the current GCP.

manager.contingent === 10000 // true

manager.index(number)

Returns GTIN / EAN for an index (which has to be inside the bounds of manager.contingent)

manager.index(0) === '1234567800004'    // true
manager.index(9999) === '1234567899992' // true
manager.index(10000)                    // Error: Index out of bounds
manager.index(-1)                       // Error: Index out of bounds

manager.all

Returns an array of all possible GTINs / EANs for the GCP.

manager.all === ['1234567800011', '1234567800028', ... 9998 more items] // true

🌻 Thanks to xbpf/gtin for providing functions used in this repository.