otpgeneratorpro/index.js

An advanced OTP generator with customizable features.

// index.js

/**
 * Generates an OTP with customizable options.
 * @param {number} [length=10] - The length of the OTP.
 * @param {Object} [options] - Optional settings for OTP generation.
 * @param {boolean} [options.digits=true] - Include digits in the OTP.
 * @param {boolean} [options.lowerCaseAlphabets=true] - Include lowercase alphabets.
 * @param {boolean} [options.upperCaseAlphabets=true] - Include uppercase alphabets.
 * @param {boolean} [options.specialChars=true] - Include special characters.
 * @returns {string} - The generated OTP.
 */
function generateOtp(length = 10, options = {}) {
    const {
        digits = true,
        lowerCaseAlphabets = true,
        upperCaseAlphabets = true,
        specialChars = true
    } = options;

    const digitChars = '0123456789';
    const lowerChars = 'abcdefghijklmnopqrstuvwxyz';
    const upperChars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
    const specialCharsSet = '!@#$%^&*()-_=+[]{}|;:,.<>?';

    let chars = '';
    if (digits) chars += digitChars;
    if (lowerCaseAlphabets) chars += lowerChars;
    if (upperCaseAlphabets) chars += upperChars;
    if (specialChars) chars += specialCharsSet;

    if (chars.length === 0) {
        throw new Error('At least one character type should be included.');
    }

    let otp = '';
    for (let i = 0; i < length; i++) {
        const randomIndex = Math.floor(Math.random() * chars.length);
        otp += chars[randomIndex];
    }

    return otp;
}

module.exports = { generateOtp };