cnpj-gen 2.0.1

🚀 Full support for the new alphanumeric CNPJ format.

🌎 Acessar documentação em português

A Python utility to generate valid CNPJ (Brazilian Business Tax ID) values.

Python Support

Passing ✔	Passing ✔	Passing ✔	Passing ✔	Passing ✔

Features

• ✅ Alphanumeric CNPJ: Generates 14-character CNPJ with optional numeric, alphabetic, or alphanumeric (default) character sets
• ✅ Optional prefix: Provide 0–12 alphanumeric characters to fix the start of the CNPJ (e.g. base ID) and generate the rest with valid check digits
• ✅ Formatting: Option to return the standard formatted string (00.000.000/0000-00)
• ✅ Reusable generator: CnpjGenerator class with default options and per-call overrides
• ✅ Type hints: Built for Python 3.10+ with full type annotations
• ✅ Minimal dependencies: Only internal packages lacus.utils and cnpj-dv for random sequence generation and check-digit calculation
• ✅ Error handling: Specific type errors and exceptions for invalid options

Installation

$ pip install cnpj-gen

Quick Start

from cnpj_gen import cnpj_gen

Basic usage:

cnpj_gen()                    # e.g. 'AB123CDE000155' (14-char alphanumeric)

cnpj_gen(format=True)         # e.g. 'AB.123.CDE/0001-55'

cnpj_gen(prefix='45623767')   # e.g. '45623767ABCD96'
cnpj_gen(                     # e.g. '45.623.767/ABCD-96'
    prefix='45623767',
    format=True,
)

cnpj_gen(type='numeric')      # e.g. '65453043000178' (digits only)
cnpj_gen(type='alphabetic')   # e.g. 'ABCDEFGHIJKL80' (letters only, except check digits)

Options can also be passed as a mapping:

cnpj_gen({'format': True, 'type': 'numeric'})

Usage

Generator options

All options are optional:

Prefix rules: base ID (first 8 chars) and branch ID (chars 9–12) cannot be all zeros; 12 repeated digits (e.g. 777777777777) are also not allowed.

cnpj_gen (helper function)

Generates a valid CNPJ string. With no options, returns a 14-character alphanumeric CNPJ. This is a convenience wrapper around CnpjGenerator(options, ...).generate().

• options (optional): CnpjGeneratorOptionsInput — a CnpjGeneratorOptions instance, a partial mapping, or None. See Generator options.
• format, prefix, type (keyword-only): Per-option overrides when options is omitted or to layer on top of a mapping.

CnpjGenerator (class)

For reusable defaults or per-call overrides, use the class:

from cnpj_gen import CnpjGenerator

generator = CnpjGenerator(type='numeric', format=True)

generator.generate()                    # e.g. '73.008.535/0005-06'
generator.generate(prefix='12345678')   # override for this call only
generator.options                       # current default options (CnpjGeneratorOptions)

• __init__(options=None, *, format=None, prefix=None, type=None): Optional default options (plain mapping, CnpjGeneratorOptions instance, or keyword arguments).
• generate(options=None, *, format=None, prefix=None, type=None): Returns a valid CNPJ; per-call options override instance defaults for that call only.
• options: Property returning the default options used when per-call options are not provided (same instance as used internally; mutating it affects future generate calls).

Default options on the instance; per-call overrides:

generator = CnpjGenerator(format=True)

generator.generate()              # formatted CNPJ
generator.generate(format=False)  # this call only: unformatted
generator.generate()              # formatted again (instance defaults preserved)

CnpjGeneratorOptions (class)

Holds options (format, prefix, type) with validation and merge support:

from cnpj_gen import CnpjGeneratorOptions

options = CnpjGeneratorOptions(
    prefix='AB123XYZ',
    type='numeric',
    format=True,
)
options.prefix   # 'AB123XYZ'
options.type     # 'numeric'
options.format   # True
options.set({'format': False})  # merge and return self
options.all      # immutable shallow snapshot of current options

• __init__(default_options=None, *overrides, format=None, prefix=None, type=None): Options merged in order (later overrides win).
• format, prefix, type: Properties with setters; prefix is validated (base/branch ineligible, repeated digits).
• set(options): Update multiple options at once; omitted fields keep their current value; returns self.
• all: Read-only snapshot of current options (MappingProxyType).
• DEFAULT_FORMAT, DEFAULT_PREFIX, DEFAULT_TYPE: Class-level default constants.

API

Exports

• cnpj_gen: (options=None, *, format=None, prefix=None, type=None) -> str
• CnpjGenerator: Class to generate CNPJ with optional default options and per-call overrides.
• CnpjGeneratorOptions: Class holding options (format, prefix, type) with validation and merge.
• CNPJ_LENGTH: 14 (constant).
• CNPJ_PREFIX_MAX_LENGTH: 12 (constant).
• Types: CnpjType, CnpjGeneratorOptionsInput, CnpjGeneratorOptionsType.
• Exceptions: CnpjGeneratorTypeError, CnpjGeneratorOptionsTypeError, CnpjGeneratorException, CnpjGeneratorOptionPrefixInvalidException, CnpjGeneratorOptionTypeInvalidException.

Errors & Exceptions

This package uses TypeError subclasses for invalid option types and Exception subclasses for invalid option values (prefix or type). You can catch specific classes or the base types.

• CnpjGeneratorTypeError (abstract) — base for option type errors
• CnpjGeneratorOptionsTypeError — an option has the wrong type (e.g. prefix not a string)
• CnpjGeneratorException (abstract) — base for option value exceptions
• CnpjGeneratorOptionPrefixInvalidException — prefix invalid (e.g. all-zero base/branch, repeated digits)
• CnpjGeneratorOptionTypeInvalidException — type is not one of 'numeric', 'alphabetic', 'alphanumeric'

from cnpj_gen import (
    cnpj_gen,
    CnpjGeneratorOptionsTypeError,
    CnpjGeneratorOptionPrefixInvalidException,
    CnpjGeneratorOptionTypeInvalidException,
    CnpjGeneratorException,
)

# Option type (e.g. `prefix` must be string)
try:
    cnpj_gen(prefix=123)
except CnpjGeneratorOptionsTypeError as e:
    print(e.option_name, e.expected_type, e.actual_type)

# Invalid prefix (e.g. all-zero base)
try:
    cnpj_gen(prefix='000000000001')
except CnpjGeneratorOptionPrefixInvalidException as e:
    print(e.reason, e.actual_input)

# Invalid type value
try:
    cnpj_gen(type='invalid')
except CnpjGeneratorOptionTypeInvalidException as e:
    print(e.expected_values, e.actual_input)

# Any exception from the package
try:
    cnpj_gen(prefix='000000000000')
except CnpjGeneratorException as e:
    print(e)

Contribution & Support

We welcome contributions! Please see our Contributing Guidelines for details. 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.

Made with ❤️ by Lacus Solutions