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HTML

              
                <!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <link rel="preconnect" href="https://fonts.gstatic.com">
  <link href="https://fonts.googleapis.com/css2?family=Oswald&display=swap" rel="stylesheet">
  <title>Password Generator with JavaScript</title>
</head>

<body>
  <form id="passwordGeneratorForm">
    <div class="container">
      <h2>Password Generator</h2>
      <div class="result__container">
        <span id="result"></span>
        <button id="copy">Copy</button>
      </div>
      <div class="options">
        <div class="option">
          <label>Length</label>
          <input type="number" id="length" min="4" max="20" value="10">
        </div>
        <div class="option">
          <label>Include Uppercase</label>
          <input type="checkbox" id="uppercase" checked>
        </div>
        <div class="option">
          <label>Include Numbers</label>
          <input type="checkbox" id="numbers" checked>
        </div>
        <div class="option">
          <label>Include Symbols</label>
          <input type="checkbox" id="symbols" checked>
        </div>
      </div>
      <button class="btn" id="generate" type="submit">Generate Password</button>
    </div>
  </form>
</body>

</html>
              
            
!

CSS

              
                * {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  height: 100vh;
  width: 100vw;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  font-family: "Oswald", sans-serif;
  background-color: #9dc5bb;
}

.container {
  padding: 1rem 1.5rem;
  border: 1px solid black;
  width: 350px;
  background-color: #bcf4f5;
}

h2 {
  text-align: center;
  padding: 15px 0;
}

/* input[type='checkbox'] {
  margin-right: 0;
} */
/* input[type='text'] {
  height: 100%;
  width: 100%;
} */

.option {
  display: flex;
  justify-content: space-between;
  padding: 4px;
}
.result__container {
  height: 50px;
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border: 1px solid black;
  padding: 0 5px;
}

.result-container #result {
  word-wrap: break-word;
  max-width: calc(100% - 40px);
}

.result__container #copy {
  height: 40px;
  width: 40px;
  background-color: #5bc0be;
  color: #ffffff;
  border: none;
  cursor: pointer;
  outline: none;
}

.result__container #copy:hover {
  background-color: #1c2541;
  color: #ffffff;
}

#generate {
  height: 40px;
  width: 100%;
  border-radius: 10px;
  border: none;
  background-color: #0b132b;
  color: #ffffff;
  font-size: 15px;
  font-weight: bold;
  cursor: pointer;
  outline: none;
}
#generate:hover {
  background-color: #5bc0be;
  color: #ffffff;
}

              
            
!

JS

              
                // Getting the DOM Eleements
const resultDOM = document.getElementById("result");
const copybtnDOM = document.getElementById("copy");
const lengthDOM = document.getElementById("length");
const uppercaseDOM = document.getElementById("uppercase");
const numbersDOM = document.getElementById("numbers");
const symbolsDOM = document.getElementById("symbols");
const generatebtn = document.getElementById("generate");
const form = document.getElementById("passwordGeneratorForm");

// Generating Character Codes
const UPPERCASE_CODES = arrayFromLowToHigh(65, 90);
const LOWERCASE_CODES = arrayFromLowToHigh(97, 122);
const NUMBER_CODES = arrayFromLowToHigh(48, 57);
const SYMBOL_CODES = arrayFromLowToHigh(33, 47)
  .concat(arrayFromLowToHigh(58, 64))
  .concat(arrayFromLowToHigh(91, 96))
  .concat(arrayFromLowToHigh(123, 126));

// Copy Password
copybtnDOM.addEventListener("click", () => {
  const textarea = document.createElement("textarea");
  const passwordToCopy = resultDOM.innerText;

  // Edge Case when Password is Empty
  if (!passwordToCopy) return;

  // Copy Functionality
  textarea.value = passwordToCopy;
  document.body.appendChild(textarea);
  textarea.select();
  document.execCommand("copy");
  textarea.remove();
  alert("Password Copied to Clipboard");
});

// Checking the options that are selected and setting the password
form.addEventListener("submit", (e) => {
  e.preventDefault();
  const characterAmount = lengthDOM.value;
  const includeUppercase = uppercaseDOM.checked;
  const includeNumbers = numbersDOM.checked;
  const includeSymbols = symbolsDOM.checked;
  const password = generatePassword(
    characterAmount,
    includeUppercase,
    includeNumbers,
    includeSymbols
  );
  resultDOM.innerText = password;
});

// Password Generating Function
let generatePassword = (
  characterAmount,
  includeUppercase,
  includeNumbers,
  includeSymbols
) => {
  let charCodes = LOWERCASE_CODES;
  if (includeUppercase) charCodes = charCodes.concat(UPPERCASE_CODES);
  if (includeSymbols) charCodes = charCodes.concat(SYMBOL_CODES);
  if (includeNumbers) charCodes = charCodes.concat(NUMBER_CODES);
  const passwordCharacters = [];
  for (let i = 0; i < characterAmount; i++) {
    const characterCode =
      charCodes[Math.floor(Math.random() * charCodes.length)];
    passwordCharacters.push(String.fromCharCode(characterCode));
  }
  return passwordCharacters.join("");
};

// Character Code Generating Function
function arrayFromLowToHigh(low, high) {
  const array = [];
  for (let i = low; i <= high; i++) {
    array.push(i);
  }
  return array;
}

              
            
!
999px

Console