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Password Generator Project Source Code

Password Generator Project Source Code: If you have some basic JavaScript knowledge and you’re looking for a beginner-friendly JavaScript project to improve your skills. In that case, you can create a Random Password Generator.

Hey friends, today in this blog, you’ll learn to create a Random Password Generator in HTML CSS & JavaScript. If you want more projects like this, you can view my 10 Best JavaScript Projects blog where I’ve listed different projects for beginners to intermediate developers.

If you don’t know, a password generator is a software or tool that creates random or customized passwords for users. These types of passwords contain different combinations of characters such as letters, numbers, symbols, etc.

In my Random Password Generator App, users can generate random passwords by customizing their preferred settings such as lowercase, uppercase, number, etc. There is also a password strength meter that indicates the strength of the user’s generated password. And last, user can copy their generated password to the clipboard

To create a Random Password Generator using HTML CSS & JavaScript, follow the given steps line by line:

  1. Create a folder. You can put any name of this folder and create the below-mentioned files inside this folder.
  2. Create a index.html file. File name must be index and its extension .html
  3. Create a style.css file. File name must be style and its extension .css
  4. Create a script.js file. File name must be script and its extension .js

Index.html File

<!DOCTYPE html>
<html lang="en" dir="ltr">
    <meta charset="utf-8">
    <title>Password Generator JavaScript | CodingNepal</title>
    <link rel="stylesheet" href="style.css">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <!-- Google Icon Link for Icons -->
    <link rel="stylesheet" href=",wght,FILL,[email protected],100..700,0..1,-50..200">
    <script src="script.js" defer></script>
    <div class="container">
      <h2>Password Generator</h2>
      <div class="wrapper">
        <div class="input-box">
          <input type="text" disabled>
          <span class="material-symbols-rounded">copy_all</span>
        <div class="pass-indicator"></div>
        <div class="pass-length">
          <div class="details">
            <label class="title">Password Length</label>
          <input type="range" min="1" max="30" value="15" step="1">
        <div class="pass-settings">
          <label class="title">Password Settings</label>
          <ul class="options">
            <li class="option">
              <input type="checkbox" id="lowercase" checked>
              <label for="lowercase">Lowercase (a-z)</label>
            <li class="option">
              <input type="checkbox" id="uppercase">
              <label for="uppercase">Uppercase (A-Z)</label>
            <li class="option">
              <input type="checkbox" id="numbers">
              <label for="numbers">Numbers (0-9)</label>
            <li class="option">
              <input type="checkbox" id="symbols">
              <label for="symbols">Symbols (!-$^+)</label>
            <li class="option">
              <input type="checkbox" id="exc-duplicate">
              <label for="exc-duplicate">Exclude Duplicate</label>
            <li class="option">
              <input type="checkbox" id="spaces">
              <label for="spaces">Include Spaces</label>
        <button class="generate-btn">Generate Password</button>

Styles.css File

/* Import Google font - Poppins */
@import url(';500;600&display=swap');
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Poppins', sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: #4285F4;
  width: 450px;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 10px 20px rgba(0,0,0,0.05);
.container h2{
  font-weight: 600;
  font-size: 1.31rem;
  padding: 1rem 1.75rem;
  border-bottom: 1px solid #d4dbe5;
  margin: 1.25rem 1.75rem;
.wrapper .input-box{
  position: relative;
.input-box input{
  width: 100%;
  height: 53px;
  color: #000;
  background: none;
  font-size: 1.06rem;
  font-weight: 500;
  border-radius: 4px;
  letter-spacing: 1.4px;
  border: 1px solid #aaa;
  padding: 0 2.85rem 0 1rem;
.input-box span{
  position: absolute;
  right: 13px;
  cursor: pointer;
  line-height: 53px;
  color: #707070;
.input-box span:hover{
  color: #4285F4!important;
.wrapper .pass-indicator{
  width: 100%;
  height: 4px;
  position: relative;
  background: #dfdfdf;
  margin-top: 0.75rem;
  border-radius: 25px;
  position: absolute;
  content: "";
  height: 100%;
  width: 50%;
  border-radius: inherit;
  transition: width 0.3s ease;
  width: 20%;
  background: #E64A4A;
  width: 50%;
  background: #f1c80b;
  width: 100%;
  background: #4285F4;
.wrapper .pass-length{
  margin: 1.56rem 0 1.25rem;
.pass-length .details{
  display: flex;
  justify-content: space-between;
.pass-length input{
  width: 100%;
  height: 5px;
.pass-settings .options{
  display: flex;
  list-style: none;
  flex-wrap: wrap;
  margin-top: 1rem;
.pass-settings .options .option{
  display: flex;
  align-items: center;
  margin-bottom: 1rem;
  width: calc(100% / 2);
.options .option:first-child{
  pointer-events: none;
.options .option:first-child input{
  opacity: 0.7;
.options .option input{
  height: 16px;
  width: 16px;
  cursor: pointer;
.options .option label{
  cursor: pointer;
  color: #4f4f4f;
  padding-left: 0.63rem;
.wrapper .generate-btn{
  width: 100%;
  color: #fff;
  border: none;
  outline: none;
  cursor: pointer;
  background: #4285F4;
  font-size: 1.06rem;
  padding: 0.94rem 0;
  border-radius: 5px;
  text-transform: uppercase;
  margin: 0.94rem 0 1.3rem;

Script.js File

const lengthSlider = document.querySelector(".pass-length input"),
options = document.querySelectorAll(".option input"),
copyIcon = document.querySelector(".input-box span"),
passwordInput = document.querySelector(".input-box input"),
passIndicator = document.querySelector(".pass-indicator"),
generateBtn = document.querySelector(".generate-btn");

const characters = { // object of letters, numbers & symbols
    lowercase: "abcdefghijklmnopqrstuvwxyz",
    numbers: "0123456789",
    symbols: "^!$%&|[](){}:;.,*+-#@<>~"

const generatePassword = () => {
    let staticPassword = "",
    randomPassword = "",
    excludeDuplicate = false,
    passLength = lengthSlider.value;

    options.forEach(option => { // looping through each option's checkbox
        if(option.checked) { // if checkbox is checked
            // if checkbox id isn't exc-duplicate && spaces
            if( !== "exc-duplicate" && !== "spaces") {
                // adding particular key value from character object to staticPassword
                staticPassword += characters[];
            } else if( === "spaces") { // if checkbox id is spaces
                staticPassword += `  ${staticPassword}  `; // adding space at the beginning & end of staticPassword
            } else { // else pass true value to excludeDuplicate
                excludeDuplicate = true;

    for (let i = 0; i < passLength; i++) {
        // getting random character from the static password
        let randomChar = staticPassword[Math.floor(Math.random() * staticPassword.length)];
        if(excludeDuplicate) { // if excludeDuplicate is true
            // if randomPassword doesn't contains the current random character or randomChar is equal 
            // to space " " then add random character to randomPassword else decrement i by -1
            !randomPassword.includes(randomChar) || randomChar == " " ? randomPassword += randomChar : i--;
        } else { // else add random character to randomPassword
            randomPassword += randomChar;
    passwordInput.value = randomPassword; // passing randomPassword to passwordInput value

const upadatePassIndicator = () => {
    // if lengthSlider value is less than 8 then pass "weak" as passIndicator id else if lengthSlider 
    // value is less than 16 then pass "medium" as id else pass "strong" as id = lengthSlider.value <= 8 ? "weak" : lengthSlider.value <= 16 ? "medium" : "strong";

const updateSlider = () => {
    // passing slider value as counter text
    document.querySelector(".pass-length span").innerText = lengthSlider.value;

const copyPassword = () => {
    navigator.clipboard.writeText(passwordInput.value); // copying random password
    copyIcon.innerText = "check"; // changing copy icon to tick = "#4285F4";
    setTimeout(() => { // after 1500 ms, changing tick icon back to copy
        copyIcon.innerText = "copy_all"; = "#707070";
    }, 1500);

copyIcon.addEventListener("click", copyPassword);
lengthSlider.addEventListener("input", updateSlider);
generateBtn.addEventListener("click", generatePassword);

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