CNPJ

!License: MIT

This package does some CNPJ magic. It
allows you to create, validate and format CNPJ documents.

> [!NOTE]
>
> This library already supports the new alphanumeric CNPJ algorithm that will be
> available starting July 2026. For more information, see
> .

HINT: Check out the CPF counter part available at
.

Installation

This lib is available as a NPM package. To install it, use the following
command:

``
npm install @fnando/cnpj --save
`

If you're using Yarn (and you should):

`
yarn add @fnando/cnpj
`

Usage

`js
// Node.js-specific
const cnpj = require("@fnando/cnpj/commonjs");

// @import
import * as cnpj from "@fnando/cnpj"; // import the whole library
import { isValid as isValidCnpj } from "@fnando/cnpj"; // import just one function

// import via

cnpj.isValid("41.381.074/6738-65");
//=> true

cnpj.isValid("41381074673865");
//=> true

cnpj.strip("41.381.074/6738-65");
//=> 41381074673865

cnpj.format("41381074673865");
//=> 41.381.074/6738-65

cnpj.generate(true); // generate formatted number
//=> 54.385.406/3140-07

cnpj.generate(); // generate unformatted number
//=> 07033324230766
`

On the web, without transformation, just use web/cnpj.min.js.

$3

By default, validations will strip any characters you provide. This means that
the following is valid, because only numbers will be considered:

`js
cnpj.isValid("41#381#074-----6738\n\n65");
//=> true

cnpj.strip("41#381#074-----6738\n\n65");
//=> 41381074673865
`

If you want to strict validate strings, use the following signature:

`js
cnpj.isValid(number, strict);
`

The same example would now return false:

`js
cnpj.isValid("41#381#074-----6738\n\n65", true);
//=> false
``