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Cover image for Random Password Generator in HTML, CSS, and Javascript
Ashutosh Tiwari
Ashutosh Tiwari

Posted on • Updated on • Originally published at incoderweb.blogspot.com

Random Password Generator in HTML, CSS, and Javascript

Hello friends, today in this blog we'll learn how to create a random password generator in HTML, CSS, and Javascript. Earlier I shared a post about how to create an analog clock design using HTML, CSS, and Javascript. I have shared many projects related to javascript. Now it's time to create a random password generator and don't forget to check javascript projects here.

If someone wants to create a strong password this password will be very helpful when it comes to creating a strong password. For creating a strong password you have to think but if someone will use this tool he doesn't need to think.

In this design [Random Password Generator] there is a password generator box as you can see in the image above it provides you options to choose what will be the character length of the password capital letters will be included or not and so on. It also has an option to copy the password to the clipboard when you hover on the generated password, a copy to clipboard button will be shown whit a cool animation and as you move the cursor it will also change its location.

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If you are a bit confused about what am I trying to say so you can check the source code and you can check preview as well.

You can check preview here.

HTML Code

<!-- ---------------- Created By InCoder ---------------- -->
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Random Password Generator - InCoder</title>
    <link rel="stylesheet" href="main.css">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.1.1/css/all.min.css">
</head>

<body>
    <div class="container">
        <div class="coppiedMessage">
            <i class="fa-solid fa-circle-check"></i>
            <p>Password Copied</p>
        </div>
        <div class="generatorBox">
            <h1 class="title">Password Generator</h1>
            <div id="passwordDisplay"><p>Password</p> <span id="copyToClipboardBtn"><i class="fa-solid fa-copy"></i></span></div>
            <form id="generatorOptions">
                <div class="options">
                    <div class="characterRange">
                        <p>Characters: <span class="characterSpan">16</span></p>
                        <div class="form-group">
                            <input type="range" id="characterRange" value="16" min="4">
                        </div>
                    </div>
                    <p>Options</p>
                    <div class="includeUppercase">
                        <div class="form-group">
                            <p>Include Uppercase</p>
                            <input type="checkbox" id="includeUppercase">
                            <label class="checkbox" for="includeUppercase">
                                <span class="slider"></span>
                            </label>
                        </div>
                    </div>
                    <div class="includeNumbers">
                        <div class="form-group">
                            <p>Include Numbers</p>
                            <input type="checkbox" id="includeNumbers">
                            <label class="checkbox" for="includeNumbers">
                                <span class="slider"></span>
                            </label>
                        </div>
                    </div>
                    <div class="includeSymbols">
                        <div class="form-group">
                            <p>Include Symbols</p>
                            <input type="checkbox" id="includeSymbols">
                            <label class="checkbox" for="includeSymbols">
                                <span class="slider"></span>
                            </label>
                        </div>
                    </div>
                    <button type="submit">Generate Password</button>
                </div>
            </form>
        </div>
    </div>

    <script src="script.js"></script>
</body>

</html>
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CSS Code

/* ---------------- Created By InCoder ---------------- */

@import url("https://fonts.googleapis.com/css2?family=Poppins:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&display=swap");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Poppins", sans-serif;
}

:root {
  --X: 0;
  --Y: 0;
  --border-radius: 0.5rem;
}

body {
  display: flex;
  height: 100vh;
  align-items: center;
  background: #008d91e3;
  justify-content: center;
}

.container .generatorBox {
  display: flex;
  align-items: center;
  border-radius: 0.8rem;
  flex-direction: column;
  justify-content: center;
  width: clamp(20rem, 22vw, 20rem);
  box-shadow: 0 0 20px #33295f8a;
  transition: box-shadow 0.3s ease-in-out;
  background-image: linear-gradient(250deg, #1e1642 30%, #211558 80%);
}

.container .generatorBox .title {
  color: #fff;
  text-align: center;
  padding-top: 0.6rem;
  font-size: clamp(1.2rem, 4vw, 1.5rem);
}

#passwordDisplay {
  border: 0;
  width: 100%;
  color: #fff;
  display: flex;
  height: 3.2rem;
  padding: 0 0.8rem;
  font-size: 0.9rem;
  overflow: hidden;
  margin-top: 0.6rem;
  position: relative;
  align-items: center;
  background: #33295f;
  justify-content: center;
  max-width: calc(100% - 1.5rem);
  border-radius: var(--border-radius);
}

#passwordDisplay p {
  max-width: 80%;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

#passwordDisplay:focus {
  outline: none;
  pointer-events: none;
}

#passwordDisplay::placeholder {
  color: #ccc;
}

#passwordDisplay:focus::placeholder {
  color: #fff;
}

#generatorOptions {
  color: #fff;
  width: calc(100% - 1.5rem);
}

#generatorOptions .form-group {
  border: 0;
  height: 3rem;
  color: #fff;
  display: flex;
  max-width: 100%;
  padding: 0 0.8rem;
  font-size: 0.9rem;
  align-items: center;
  margin-bottom: 0.5rem;
  background: #33295f;
  justify-content: space-between;
  border-radius: var(--border-radius);
}

#generatorOptions .characterRange {
  font-size: 0.7rem;
  margin-top: 0.6rem;
}

#generatorOptions .characterRange .form-group {
  justify-content: center !important;
}

#generatorOptions .options > p {
  font-size: 0.8rem;
  margin-bottom: 0.1rem;
}

#copyToClipboardBtn {
  opacity: 0;
  z-index: 1;
  top: var(--Y);
  width: 2.6rem;
  display: flex;
  height: 2.6rem;
  left: var(--X);
  cursor: pointer;
  color: #1e1642;
  font-size: 1.2rem;
  position: absolute;
  border-radius: 50%;
  align-items: center;
  pointer-events: none;
  transform: scale(0.2);
  justify-content: center;
  background-color: #fff;
  transition: transform 0.6s cubic-bezier(0.24, -0.08, 0.24, 1.81);
}

#passwordDisplay.copyBtnShow #copyToClipboardBtn {
  transform: translate(-50%, -50%) scale(1);
}

#characterRange {
  width: 90%;
  height: 2px;
  opacity: 0.7;
  outline: none;
  position: relative;
  background: #d3d3d3a1;
  -webkit-transition: 0.2s;
  -webkit-appearance: none;
  transition: opacity 0.2s;
}

#characterRange:hover {
  opacity: 1;
}

#characterRange::-webkit-slider-thumb {
  width: 20px;
  height: 20px;
  cursor: pointer;
  appearance: none;
  border-radius: 50%;
  background: #5d68e2;
  -webkit-appearance: none;
}

#characterRange::-moz-range-thumb {
  width: 20px;
  height: 20px;
  cursor: pointer;
  border-radius: 50%;
  background: #5d68e2;
}

#characterRange::before {
  content: "4";
  left: -14px;
  width: auto;
  height: auto;
  bottom: -8px;
  color: #fff;
  font-size: 0.7rem;
  position: absolute;
}

#characterRange::after {
  content: "100";
  right: -23px;
  width: auto;
  height: auto;
  bottom: -8px;
  color: #fff;
  font-size: 0.7rem;
  position: absolute;
}

#generatorOptions .form-group input[type="checkbox"] {
  width: 0;
  height: 0;
  visibility: hidden;
}

#generatorOptions .checkbox {
  width: 2.6rem;
  display: flex;
  height: 1.5rem;
  padding: 0 4px;
  cursor: pointer;
  position: relative;
  align-items: center;
  border-radius: 50rem;
  transition: background-color 0.3s cubic-bezier(0.55, -0.34, 0.16, 1.95);
  background-color: rgba(214, 214, 214, 0.434);
}

#generatorOptions .checkbox::before {
  content: "";
  left: 4px;
  width: 45%;
  height: 75%;
  border-radius: 50%;
  position: absolute;
  background-color: #fff;
  transition: left 0.3s cubic-bezier(0.55, -0.34, 0.16, 1.95);
}

#generatorOptions .form-group input[type="checkbox"]:checked + .checkbox {
  background-color: #7c3aed;
}

#generatorOptions
  .form-group
  input[type="checkbox"]:checked
  + .checkbox::before {
  left: 18px;
}

#generatorOptions button[type="submit"] {
  border: 0;
  width: 100%;
  color: #fff;
  display: flex;
  height: 2.5rem;
  cursor: pointer;
  font-size: 1rem;
  align-items: center;
  margin-bottom: 1rem;
  border-radius: 0.4rem;
  justify-content: center;
  background: linear-gradient(45deg, #7c3aed 30%, #db2777);
}

.coppiedMessage {
  top: 10%;
  left: 50%;
  opacity: 0;
  width: 12rem;
  height: 2rem;
  display: flex;
  color: #30f28a;
  border-radius: 5px;
  position: absolute;
  align-items: center;
  pointer-events: none;
  background: #33295f;
  justify-content: center;
  transform: translate(-50%, 25px);
  transition: transform .3s cubic-bezier(0.18,-0.02, 0.3, 1.6);
}

.coppiedMessage.success{
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%, 0);
}

.coppiedMessage i{
    color: #30f28a;
    margin-right: .4rem;
}
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Javascript Code

// ---------------- Created By InCoder ----------------

let passwordDisplayText = document.querySelector('#passwordDisplay p')
let copyToClipboardBtn = document.querySelector('#copyToClipboardBtn')
let includeUppercase = document.querySelector('#includeUppercase')
let passwordDisplay = document.querySelector('#passwordDisplay')
let characterRange = document.querySelector('#characterRange')
let includeNumbers = document.querySelector('#includeNumbers')
let coppiedMessage = document.querySelector('.coppiedMessage')
let includeSymbols = document.querySelector('#includeSymbols')
let characterSpan = document.querySelector('.characterSpan')

let arrayLowToHigh = (low, high) => {
    let array = []
    for (let i = low; i <= high; i++) {
        array.push(i);
    }
    return array
}

let LOWERCASE_CHAR_CODES = arrayLowToHigh(97, 122);
let UPPERCASE_CHAR_CODES = arrayLowToHigh(65, 90);
let NUMBERS_CHAR_CODES = arrayLowToHigh(48, 57);
let SYMBOL_CHAR_CODES = arrayLowToHigh(34, 47).concat(
    arrayLowToHigh(58, 64)
).concat(
    arrayLowToHigh(91, 96)
).concat(
    arrayLowToHigh(123, 126)
);


// ---------------- Character value changer ----------------

characterRange.addEventListener('input', e => {
    characterSpan.innerHTML = e.target.value
})

// ---------------- Character value changer End ----------------

// ---------------- Password Generator Function ----------------

let generatePassword = (characterRange, includeUppercase, includeNumbers, includeSymbols) => {
    let charCodes = LOWERCASE_CHAR_CODES;

    if (includeUppercase) charCodes = charCodes.concat(UPPERCASE_CHAR_CODES)
    if (includeNumbers) charCodes = charCodes.concat(NUMBERS_CHAR_CODES)
    if (includeSymbols) charCodes = charCodes.concat(SYMBOL_CHAR_CODES)

    let passwordChar = []
    for (let a = 0; a < characterRange; a++) {
        let characterCode = charCodes[Math.floor(Math.random() * characterRange)]
        passwordChar.push(String.fromCharCode(characterCode))
    }
    return passwordChar.join('')
}

// ---------------- Password Generator Function End ----------------

// ---------------- Form Submit ----------------

let generatorOptions = document.querySelector('#generatorOptions')

generatorOptions.addEventListener('submit', e => {
    e.preventDefault();
    let password = generatePassword(characterRange.value, includeUppercase.checked, includeNumbers.checked, includeSymbols.checked);

    passwordDisplayText.innerHTML = password

    // ---------------- Copy Button Function ----------------

    passwordDisplay.addEventListener('mousemove', (e) => {
        resultContainerBound = {
            left: passwordDisplay.getBoundingClientRect().left,
            top: passwordDisplay.getBoundingClientRect().top,
        };
        copyToClipboardBtn.style.opacity = '1';
        copyToClipboardBtn.style.pointerEvents = 'all';
        passwordDisplay.classList.add('copyBtnShow')
        copyToClipboardBtn.style.setProperty("--X", `${e.x - resultContainerBound.left}px`);
        copyToClipboardBtn.style.setProperty("--Y", `${e.y - resultContainerBound.top}px`);
    })

    passwordDisplay.addEventListener('mouseleave', (e) => {
        setTimeout(() => {
            copyToClipboardBtn.style.opacity = '0';
            copyToClipboardBtn.style.pointerEvents = 'none';
            copyToClipboardBtn.style.setProperty("--X", '0');
            copyToClipboardBtn.style.setProperty("--Y", '0');
        }, 300)
        passwordDisplay.classList.remove('copyBtnShow')
    })

    // ---------------- Copy Button Animation End ----------------

    copyToClipboardBtn.addEventListener('click', () => {
        const textarea = document.createElement("textarea");
        textarea.value = password;
        document.body.appendChild(textarea);
        textarea.select();
        document.execCommand("copy");
        textarea.remove();

        coppiedMessage.classList.add('success')

        setTimeout(() => {
            coppiedMessage.classList.remove('success')
        }, 2500)
    })
})
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