@lacussoft/cnpj-gen/build/index.esm.js

Utility function to generate valid CNPJ (Brazilian company ID).

/**
 * LacusSoft :: cnpj-gen v1.2.0
 *
 * @author Julio L. Muller.
 * @license MIT - 2021-2025
 */

import cnpjFmt from '@lacussoft/cnpj-fmt';
import numOnly from 'num-only';
import mergeDeep from 'deepmerge';

function calculateDigit(cnpjSequence) {
  let index = 2;
  const sum = [...cnpjSequence].reverse().reduce((previousResult, number) => {
    const result = previousResult + number * index;
    index = index === 9 ? 2 : index + 1;
    return result;
  }, 0);
  const remainder = sum % 11;
  return remainder < 2 ? 0 : 11 - remainder;
}

const defaultOptions = {
  format: false,
  prefix: ""
};
function mergeOptions(customOptions = {}) {
  return mergeDeep(defaultOptions, customOptions);
}

function numberGenerator(length) {
  const numericSequence = [];
  while (numericSequence.length < length) {
    const random = Math.random() * 10;
    const integer = Math.floor(random);
    numericSequence.push(integer);
  }
  return numericSequence;
}

function cnpjGen(options) {
  const userOptions = mergeOptions(options);
  const baseSequence = numOnly(userOptions.prefix);
  const prefixLength = baseSequence.length;
  if (prefixLength < 0 || prefixLength > 12) {
    throw new Error('Option "prefix" must be a string containing between 1 and 12 digits.');
  }
  if (prefixLength > 8 && baseSequence.slice(8) === "0000") {
    throw new Error('The branch ID (characters 8 to 11) cannot be "0000".');
  }
  const branchID = [0, 0, 0, Math.ceil(Math.random() * 9)];
  const cnpjSequence = baseSequence.split("").map(Number).concat(numberGenerator(8 - prefixLength)).concat(branchID.slice(0, 12 - prefixLength));
  cnpjSequence.push(calculateDigit(cnpjSequence));
  cnpjSequence.push(calculateDigit(cnpjSequence));
  return userOptions.format ? cnpjFmt(cnpjSequence.join("")) : cnpjSequence.join("");
}

export { cnpjGen as default };
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