randomString.js

const randomString = (length) => {
    const letters = 'abcdefghijklmnopqrstuvwxyz';
    const numbers = '1234567890';
    const charset = `${letters}${letters.toUpperCase()}${numbers}`;

    const randomCharacter = (character) => character[Math.floor(Math.random() * character.length)];

    let result = '';
    for (let i = 0; i < length; i++) {
        result += randomCharacter(charset);
    }
    return result;
};