Validate, generate and format CNPJ numbers


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727May 30, 2021Apr 4, 2018Minified + gzip package size for @fnando/cnpj in KB



Build Status NPM package version License: MIT Minified size Minified+Gzip size

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

HINT: Check out the CPF counter part available at https://github.com/fnando/cpf.


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


// 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 <script>; the lib will available as window.cnpj
// <script src="cnpj.js"></script>

//=> true

//=> true

//=> 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.

Strict Validation

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

//=> true

//=> 41381074673865

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

cnpj.isValid(number, strict);

The same example would now return false:

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

If you find any bugs or have a feature request, please open an issue on github!

The npm package download data comes from npm's download counts api and package details come from npms.io.