Validation

rut-kit offers two ways to validate RUTs depending on what you need to know.

Just need to know if it's valid?

Use isValidRut:

import { isValidRut } from 'rut-kit'

if (isValidRut(input)) {
  // Valid RUT
}

Need to know what failed?

Use validateRut + getErrorMessage:

import { validateRut, getErrorMessage } from 'rut-kit'

const result = validateRut(input)

if (result.valid) {
  console.log(result.rut) // Clean RUT: '189726317'
} else {
  console.log(getErrorMessage(result.error))
  // 'Invalid RUT format' or 'Invalid check digit'
}

Have data with unusual separators?

If you receive RUTs from Excel, PDFs, or other sources with commas or asterisks, clean first:

import { cleanRut, validateRut } from 'rut-kit'

const dirty = '18,972,631-7'
const clean = cleanRut(dirty)  // '189726317'
validateRut(clean)             // { valid: true, rut: '189726317' }

Permissive vs Strict

• cleanRut() is permissive: accepts any separator
• validateRut() is strict: only valid Chilean formats

Recommended flow for dirty data: cleanRut() -> validateRut()

Custom Messages

You can change the error messages:

getErrorMessage(result.error, {
  invalidFormat: 'Check the RUT format',
  invalidCheckDigit: 'The RUT is not valid'
})

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See full reference at API rut-kit