passRandomizer.js

const keys = {
    upperCase: "ABCDEFGHIJKLMNOPQRSTUVWXYZ",
    lowerCase: "abcdefghijklmnopqrstuvwxyz",
    number: "1234567890",
    symbol: "!@#$%^&*()_+~\`|}{[]:;?><,./-="
  }
  const getKey = [
    function upperCase() {
      return keys.upperCase[Math.floor(Math.random() * keys.upperCase.length)];
    },
    function lowerCase() {
      return keys.lowerCase[Math.floor(Math.random() * keys.lowerCase.length)];
    },
    function number() {
      return keys.number[Math.floor(Math.random() * keys.number.length)];
    },
    function symbol() {
      return keys.symbol[Math.floor(Math.random() * keys.symbol.length)];
    }
  ];
  
  function createPassword() {
    const passwordBox = document.getElementById("passwordBox");
    const passLength = 16;
    let password = "";
    while (passLength > password.length) {
      let keyToAdd = getKey[Math.floor(Math.random() * getKey.length)];
      password += keyToAdd();
    }
    passwordBox.innerHTML = password;
  }
  function copyPassword() {
    const textarea = document.createElement("textarea");
    const password = document.getElementById("passwordBox").innerText;
    if (!password) { return; }
    textarea.value = password;
    document.body.appendChild(textarea);
    textarea.select();
    document.execCommand("copy");
    textarea.remove();
  }