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Implements support for the new alphanumeric CNPJ format being introduced
in July 2026 by Brazil's Federal Revenue Service, while maintaining full
backward compatibility with numeric CNPJs.
Changes:
- Add alphanumeric validation with modulo 11 check digit algorithm
- Add strict mode option to validate() for uppercase enforcement
- Update format() to handle both numeric and alphanumeric CNPJs
- Update generate() with optional format parameter (numeric/alphanumeric)
- Add comprehensive test coverage (24 tests, all passing)
- Update documentation with examples and API details
- Bump version to 5.1.0 (minor - backward compatible)
The validate() function now accepts an optional second parameter:
{ strict: boolean } - rejects lowercase letters when true
The generate() function now accepts an optional parameter:
{ format: 'numeric' | 'alphanumeric' } - defaults to 'numeric'
All existing code continues to work without modifications.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Version bumps are handled during release tagging after merge to main. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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Implements support for the new alphanumeric CNPJ format being introduced in July 2026 by Brazil's Federal Revenue Service, while maintaining full backward compatibility with numeric CNPJs.
Changes:
The validate() function now accepts an optional second parameter:
{ strict: boolean } - rejects lowercase letters when true
The generate() function now accepts an optional parameter:
{ format: 'numeric' | 'alphanumeric' } - defaults to 'numeric'
All existing code continues to work without modifications.
Closes #33.