Toolkit to deal with CNPJ data (Brazilian employer ID): validation, formatting and generation of valid IDs.

PHP Support

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Installation

$ composer require lacus/cnpj-utils

Import

<?php
// Using class-based resource
use Lacus\CnpjUtils\CnpjUtils;

// Or using function-based approach
use function Lacus\CnpjUtils\cnpj_fmt;
use function Lacus\CnpjUtils\cnpj_gen;
use function Lacus\CnpjUtils\cnpj_val;

Usage

Object-Oriented Usage

The CnpjUtils class provides a unified interface for all CNPJ operations:

$cnpjUtils = new CnpjUtils();
$cnpj = '03603568000195';

// Format CNPJ
echo $cnpjUtils->format($cnpj);       // returns '03.603.568/0001-95'

// Validate CNPJ
echo $cnpjUtils->isValid($cnpj);      // returns true

// Generate CNPJ
echo $cnpjUtils->generate();          // returns '65453043000178'

With Configuration Options

You can configure the formatter and generator options in the constructor:

$cnpjUtils = new CnpjUtils(
    formatter: [
        'hidden' => true,
        'hiddenKey' => '#',
        'hiddenStart' => 5,
        'hiddenEnd' => 13
    ],
    generator: [
        'format' => true
    ]
);

$cnpj = '03603568000195';
echo $cnpjUtils->format($cnpj);       // returns '03.603.###/####-##'
echo $cnpjUtils->generate();          // returns '73.008.535/0005-06'

Functional Programming

The package also provides standalone functions for each operation:

$cnpj = '03603568000195';

// Format CNPJ
echo cnpj_fmt($cnpj);                 // returns '03.603.568/0001-95'

// Validate CNPJ
echo cnpj_val($cnpj);                 // returns true

// Generate CNPJ
echo cnpj_gen();                      // returns '65453043000178'

API Reference

Formatting (cnpj_fmt / CnpjUtils::format)

Formats a CNPJ string with customizable delimiters and masking options.

cnpj_fmt(
    string $cnpjString,
    ?bool $escape = null,
    ?bool $hidden = null,
    ?string $hiddenKey = null,
    ?int $hiddenStart = null,
    ?int $hiddenEnd = null,
    ?string $dotKey = null,
    ?string $slashKey = null,
    ?string $dashKey = null,
    ?Closure $onFail = null,
): string

Parameters:

Parameter	Type	Default	Description
escape	?bool	false	Whether to HTML escape the result
hidden	?bool	false	Whether to hide digits with a mask
hiddenKey	?string	'*'	Character to replace hidden digits
hiddenStart	?int	5	Starting index for hidden range (0-13)
hiddenEnd	?int	13	Ending index for hidden range (0-13)
dotKey	?string	'.'	String to replace dot characters
slashKey	?string	'/'	String to replace slash character
dashKey	?string	'-'	String to replace dash character
onFail	?callable	fn($v) => $v	Fallback function for invalid input

Examples:

$cnpj = '03603568000195';

// Basic formatting
echo cnpj_fmt($cnpj);                 // '03.603.568/0001-95'

// With hidden digits
echo cnpj_fmt($cnpj, hidden: true);   // '03.603.***/****-**'

// Custom delimiters
echo cnpj_fmt($cnpj, dotKey: '', slashKey: '|', dashKey: '_');  // '03603568|0001_95'

// Custom hidden range
echo cnpj_fmt($cnpj, hidden: true, hiddenStart: 2, hiddenEnd: 8, hiddenKey: '#');  // '03###.###/0001-95'

Generation (cnpj_gen / CnpjUtils::generate)

Generates valid CNPJ numbers with optional formatting and prefix completion.

cnpj_gen(
    ?bool $format = null,
    ?string $prefix = null,
): string

Parameters:

Parameter	Type	Default	Description
format	?bool	false	Whether to format the output
prefix	?string	''	Prefix to complete with valid digits (1-12 digits)

Examples:

// Generate random CNPJ
echo cnpj_gen();                      // '65453043000178'

// Generate formatted CNPJ
echo cnpj_gen(format: true);          // '73.008.535/0005-06'

// Complete a prefix
echo cnpj_gen(prefix: '45623767');    // '45623767000296'

// Complete and format
echo cnpj_gen(prefix: '456237670002', format: true);  // '45.623.767/0002-96'

Validation (cnpj_val / CnpjUtils::isValid)

Validates CNPJ numbers using the official algorithm.

cnpj_val(string $cnpjString): bool

Examples:

// Valid CNPJ
echo cnpj_val('98765432000198');      // true
echo cnpj_val('98.765.432/0001-98');  // true

// Invalid CNPJ
echo cnpj_val('98765432000199');      // false

Advanced Usage

Accessing Individual Components

You can access the individual formatter, generator, and validator instances:

$cnpjUtils = new CnpjUtils();

// Get individual components
$formatter = $cnpjUtils->getFormatter();
$generator = $cnpjUtils->getGenerator();
$validator = $cnpjUtils->getValidator();

// Use them directly
$formatter->format('03603568000195', hidden: true);
$generator->generate(format: true);
$validator->isValid('03603568000195');

Custom Error Handling

$cnpj = '123'; // Invalid length

// Custom fallback
echo cnpj_fmt($cnpj, onFail: fn($v) => "Invalid CNPJ: {$v}");  // 'Invalid CNPJ: 123'

// Return original value
echo cnpj_fmt($cnpj);  // '123'

Dependencies

This package is built on top of the following specialized packages:

• lacus/cnpj-fmt - CNPJ formatting
• lacus/cnpj-gen - CNPJ generation
• lacus/cnpj-val - CNPJ validation

Contribution & Support

We welcome contributions! Please see our Contributing Guidelines for details. But if you find this project helpful, please consider:

• ⭐ Starring the repository
• 🤝 Contributing to the codebase
• 💡 Suggesting new features
• 🐛 Reporting bugs

License

This project is licensed under the MIT License - see the LICENSE file for details.

Changelog

See CHANGELOG for a list of changes and version history.

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Made with ❤️ by Lacus Solutions