generates a pw

pw.js

import * as crypto from 'node:crypto';

const charactersUpper = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
const charactersLower = 'abcdefghijklmnopqrstuvwxyz';
const symbols = '!@#$%&?^*.:,;_-';
const decimalNumbers = '0123456789';

console.log(createRandomString(12, true, 'password', true));

function createRandomString(length = 16, useSymbols = true, prefix = '', useNumbers = true) {
	let possibleChars = charactersUpper + charactersLower + (useSymbols ? symbols : '') + (useNumbers ? decimalNumbers : '');

	const requiredChars = [rand(charactersUpper, 1), rand(charactersLower, 1)];
	if (useSymbols) requiredChars.push(rand(symbols, 1));
	if (useNumbers) requiredChars.push(rand(decimalNumbers, 1));

	if (length < requiredChars.length + prefix.length) {
		throw new Error('Length must be at least ' + (requiredChars.length + prefix.length));
	}

	const randLength = length - requiredChars.length - prefix.length;

	const unshuffled = requiredChars.concat(rand(possibleChars, randLength));

	const shuffled = shuffleArray(unshuffled);

	return prefix + shuffled.join('');
}

function shuffleArray(arr) {
	for (let i = arr.length - 1; i >= 0; i--) {
		const j = randomInt(i + 1);
		[arr[i], arr[j]] = [arr[j], arr[i]];
	}

	return arr;
}

function rand(str, num) {
	const randArr = new Uint32Array(num);
	crypto.getRandomValues(randArr);
	let output = [];
	for (let n of randArr) {
		output.push(str[n % str.length]);
	}
	return output;
}

function randomInt(max) {
	return crypto.getRandomValues(new Uint32Array(1))[0] % max;
}