findCardBrand

v0.0.5

Detect a payment-card brand from a number's digits by its IIN/BIN pattern. Returns the brand whose pattern matches the most leading digits (so it narrows down as the user types), or undefined if none match. Pure.

Source

Example

findCardBrand('4111111111111111')?.brand; // 'visa'
findCardBrand('371449635398431')?.brand;   // 'american-express'
findCardBrand('2200123412341234')?.brand;  // 'mir'

Signature

export function findCardBrand(
  digits: string,
  brands: readonly CardBrand[] = CARD_BRANDS,
): CardBrand | undefined{ ... }

Parameters

Parameter	Type	Default	Description
`digits`	`string`	—	The card number's digits (no separators)
`brands`?	`readonly CardBrand[]`	`CARD_BRANDS`	The brand list

Returns

CardBrand | undefinedThe detected brand, or undefined