JavaScript Project - Password Generator

In this tutorial, we will learn how to create a simple Password Generator project in JavaScript.

JavaScript Password Generator Application

Create a folder called password-generator as project workspace and we will create all the project files inside this folder.

1. index.html

Let's create index.html and add the following code to it:

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>Password Generator</title> <link rel="stylesheet" href="style.css" /> <script src="script.js" defer></script> </head> <body> <div class="pw-container"> <div class="pw-header"> <div class="pw"> <span id="pw">l823Zs78#Css09@</span> <button id="copy">Copy</button> </div> </div> <div class="pw-body"> <div class="form-control"> <label for="len">Password Length</label> <input id="len" value="15" type="number" min="2" max="30" /> </div> <div class="form-control"> <label for="upper">Contain Uppercase Letters</label> <input id="upper" type="checkbox" /> </div> <div class="form-control"> <label for="lower">Contain Lowercase Letters</label> <input id="lower" type="checkbox" /> </div> <div class="form-control"> <label for="number">Contain Numbers</label> <input id="number" type="checkbox" /> </div> <div class="form-control"> <label for="symbol">Contain Symbols</label> <input id="symbol" type="checkbox" /> </div> <button class="generate" id="generate"> Generate Password </button> </div> </div> </body> </html>

2. script.js

Let's create a JavaScript file named script.js and add the following JavaScript code to it:

const pwEl = document.getElementById("pw"); const copyEl = document.getElementById("copy"); const lenEl = document.getElementById("len"); const upperEl = document.getElementById("upper"); const lowerEl = document.getElementById("lower"); const numberEl = document.getElementById("number"); const symbolEl = document.getElementById("symbol"); const generateEl = document.getElementById("generate"); const upperLetters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; const lowerLetters = "abcdefghijklmnopqrstuvwxyz"; const numbers = "0123456789"; const symbols = "!@#$%^&*()_+="; function getLowercase() { return lowerLetters[Math.floor(Math.random() * lowerLetters.length)]; } function getUppercase() { return upperLetters[Math.floor(Math.random() * upperLetters.length)]; } function getNumber() { return numbers[Math.floor(Math.random() * numbers.length)]; } function getSymbol() { return symbols[Math.floor(Math.random() * symbols.length)]; } function generatePassword() { const len = lenEl.value; let password = ""; if (upperEl.checked) { password += getUppercase(); } if (lowerEl.checked) { password += getLowercase(); } if (numberEl.checked) { password += getNumber(); } if (symbolEl.checked) { password += getSymbol(); } for (let i = password.length; i < len; i++) { const x = generateX(); password += x; } pwEl.innerText = password; } function generateX() { const xs = []; if (upperEl.checked) { xs.push(getUppercase()); } if (lowerEl.checked) { xs.push(getLowercase()); } if (numberEl.checked) { xs.push(getNumber()); } if (symbolEl.checked) { xs.push(getSymbol()); } if (xs.length === 0) return ""; return xs[Math.floor(Math.random() * xs.length)]; } generateEl.addEventListener("click", generatePassword); copyEl.addEventListener("click", () => { const textarea = document.createElement("textarea"); const password = pwEl.innerText; if (!password) { return; } textarea.value = password; document.body.appendChild(textarea); textarea.select(); document.execCommand("copy"); textarea.remove(); alert("Password copied to clipboard"); });

3. style.css

Let's create a CSS file named style.css and add the following CSS code to it:

@import url("https://fonts.googleapis.com/css2?family=Poppins:wght@200;400;600&display=swap"); * { box-sizing: border-box; } body { background-color: rebeccapurple; color: white; display: flex; align-items: center; justify-content: center; font-family: "Poppins", sans-serif; margin: 0; min-height: 100vh; } .pw-container { background-color: rgb(46, 12, 80); box-shadow: 0 4px 10px rgba(0, 0, 0, 0.5); min-width: 400px; } .pw-header { padding: 1rem; } .pw { background-color: rgb(69, 28, 109); display: flex; font-size: 1.5rem; align-items: center; height: 70px; width: 100%; position: relative; padding: 1rem; overflow: auto; } .pw button { background-color: white; border: none; color: rgb(29, 2, 56); cursor: pointer; font-family: inherit; font-weight: bold; padding: 0.25rem; position: absolute; top: 0; right: 0; transform: translate(0, 20%); transition: opacity 0.2s ease, transform 0.2s ease; opacity: 0; } .pw:hover button { opacity: 1; transform: translate(0, 0%); } .pw-body { padding: 0 1rem 1rem; } .form-control { color: #eee; display: flex; justify-content: space-between; margin: 0.75rem 0; } .generate { background-color: #ecb602; border: none; color: rebeccapurple; cursor: pointer; display: block; font-size: 1.5rem; font-weight: bold; padding: 0.75rem; margin-top: 1rem; width: 100%; }

Open index.html in Browser

Let's open the index.html file in the browser and you will be able to see the following screen:

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