Función para validar DNI Peruano

dni_peru_validate.js

/**
 * Verifica que un DNI de Perú sea valido
 * @param {String} data DNI
 * @returns {Boolean}
 */
const validate = data => {
  const dni = data.replace('-', '').trim().toUpperCase()
  if (!dni || dni.length < 9) return false
  const multiples = [3, 2, 7, 6, 5, 4, 3, 2]
  const dcontrols = {
    numbers: [6, 7, 8, 9, 0, 1, 1, 2, 3, 4, 5],
    letters: ['K', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J']
  }
  const numdni = dni.substring(0, dni.length - 1).split('')
  const dcontrol = dni.substring(dni.length - 1)
  const dsum = numdni.reduce((acc, digit, index) => {
    acc += digit * multiples[index]
    return acc
  }, 0)
  const key = 11 - (dsum % 11)
  const index = (key === 11) ? 0 : key
  if (/^\d+$/.test(dni)) {
    return dcontrols.numbers[index] === parseInt(dcontrol, 10)
  }
  return dcontrols.letters[index] === dcontrol
}