Script to Validate SENIAT RIF number in Venezuela

ValidateRIF.js

const NATIONALITY_ARRAY = {
    'V': '1',
    'E': '2',
    'J': '3',
    'P': '4',
    'G': '5',
    'C': '3'
};

const MULTIPLIERS = [4, 3, 2, 7, 6, 5, 4, 3, 2];

function validateRif(value) {
    if (typeof value !== 'string') {
        return false;
    }

    // Convert value to uppercase
    const upperValue = value.toUpperCase();

    // Check if the RIF has a valid format
    const rifPattern = /^[VEPJGC]-?\d{8}-?\d$/i;
    if (!rifPattern.test(upperValue)) {
        return false;
    }

    // Remove dashes from the RIF
    const fullRif = upperValue.replace(/-/g, '');
    const contributor = fullRif.slice(0, -1);
    const expectedValidationNumber = fullRif.slice(-1);

    return expectedValidationNumber === calculateValidationNumber(contributor);
}

function calculateValidationNumber(rif) {
    // Replace the first character with its numeric value
    const numericRif = NATIONALITY_ARRAY[rif[0]] + rif.slice(1);

    // Calculate the weighted sum
    const sum = Array.from(numericRif).reduce((acc, digit, index) => {
        return acc + parseInt(digit, 10) * MULTIPLIERS[index];
    }, 0);

    // Calculate the validation number
    const remainder = sum % 11;
    const difference = 11 - remainder;

    // Return the validation number
    return (difference > 9) ? '0' : difference.toString();
}

// Example usage:
const value = 'V-12345678-9';
const isValid = validateRif(value);
console.log(`Is the RIF valid? ${isValid}`);