Chilean RUT Validator

A TypeScript package for validating and formatting Chilean RUT (Rol Único Tributario) numbers.

Installation

npm install cl-rut-validator

Features

• Written in TypeScript with full type definitions
• Comprehensive validation for Chilean RUT numbers
• Security-focused implementation
• Formatting to standard Chilean format (XX.XXX.XXX-X)
• No external dependencies

Usage

JavaScript (CommonJS)

const { isValidRut, validateRut, formatRut } = require('cl-rut-validator');

// Basic validation
console.log(isValidRut('12.345.678-5')); // true

// Detailed validation
const validation = validateRut('12.345.678-5');
console.log(validation);
/*
{
  isValid: true,
  formatted: '12.345.678-5',
  raw: '123456785',
  rutNumber: '12345678',
  verificationDigit: '5'
}
*/

// Formatting
console.log(formatRut('123456785')); // '12.345.678-5'

TypeScript / ES Modules

import { isValidRut, validateRut, formatRut, RutValidationResult } from 'cl-rut-validator';

// Basic validation
console.log(isValidRut('12.345.678-5')); // true

// Detailed validation with type safety
const validation: RutValidationResult = validateRut('12.345.678-5');
console.log(validation);
/*
{
  isValid: true,
  formatted: '12.345.678-5',
  raw: '123456785',
  rutNumber: '12345678',
  verificationDigit: '5'
}
*/

// Formatting
console.log(formatRut('123456785')); // '12.345.678-5'

API

isValidRut(rut: unknown): boolean

Validates if a given input is a valid Chilean RUT.

• Parameters: rut (any type) - The RUT to validate
• Returns: boolean - True if the RUT is valid, false otherwise

validateRut(rut: unknown): RutValidationResult

Returns detailed validation information for a RUT.

• Parameters: rut (any type) - The RUT to validate
• Returns: RutValidationResult object with the following properties:
  • isValid (boolean): Whether the RUT is valid
  • formatted (string|null): The formatted RUT (if valid)
  • raw (string): The cleaned RUT without formatting
  • rutNumber (string, optional): The RUT number without verification digit (if valid)
  • verificationDigit (string, optional): The verification digit (if valid)

formatRut(rut: unknown): string | null

Formats a RUT to standard Chilean format (XX.XXX.XXX-X).

• Parameters: rut (any type) - The RUT to format
• Returns: string|null - The formatted RUT if valid, or null if invalid

cleanRut(rut: unknown): string

Cleans a RUT by removing formatting characters.

• Parameters: rut (any type) - The RUT to clean
• Returns: string - The cleaned RUT string

calculateVerificationDigit(rutNumber: string | number): string

Calculates the verification digit for a given RUT number.

• Parameters: rutNumber (string|number) - RUT number without verification digit
• Returns: string - The calculated verification digit

Understanding Chilean RUT

The Chilean RUT (Rol Único Tributario) is the national tax ID number in Chile. It consists of:

1. A sequence of digits (typically 7-8 digits)
2. A verification digit (0-9 or 'K')

The verification digit is calculated using Module 11 algorithm.

Security

This package includes several security features:

• Protection against DoS attacks with input length limits
• Proper handling of all input types
• Comprehensive error management
• Protection against common validation bypass techniques

License

MIT