Password Generator Project using JavaScript

In this project, we’ll create a Password Generator using JavaScript Classes and Objects. This program will generate a random password that contains at least one lowercase letter, one uppercase letter, and one special character — fulfilling the basic conditions of a secure password.

⚙️ Project Objective

The main goal of this project is to create a password generator that:

Generates random passwords of desired length.

Ensures the password contains at least one lowercase, one uppercase letter and one special character

Uses class and object-oriented design in JavaScript.

Code:-

class Password {
  constructor() {
    console.log("Welcome to Password Generator");
  }

  generatePassword(len) {
    if (len < 3) {
      return "Password must be at least 3 characters long!";
    }

    let lowercase = "abcdefghijklmnopqrstuvwxyz";
    let uppercase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    let numbers = "0123456789";
    let special = "!@#$%^&*()";

    // Ensure at least one of each required type (lower, upper, special)
    let pass = "";
    pass += lowercase[Math.floor(Math.random() * lowercase.length)];
    pass += uppercase[Math.floor(Math.random() * uppercase.length)];
    pass += special[Math.floor(Math.random() * special.length)];

    // Fill remaining with all characters
    let allChars = lowercase + uppercase + numbers + special;
    for (let i = pass.length; i < len; i++) {
      pass += allChars[Math.floor(Math.random() * allChars.length)];
    }

    // Shuffle to avoid predictable order
    pass = pass.split("").sort(() => Math.random() - 0.5).join("");
    return pass;
  }
}

// Example
let p = new Password();
console.log(p.generatePassword(8));  // Example: "aF@9kd2G"

Explanation:-

The class Password is created to generate random passwords:

class Password {
  constructor() {
    console.log("Welcome to Password Generator");
  }

The method generatePassword(len) takes the desired password length as input and checks if it’s at least 3:

if (len < 3) {
  return "Password must be at least 3 characters long!";
}

Character sets for lowercase, uppercase, numbers, and special characters are defined

let lowercase = "abcdefghijklmnopqrstuvwxyz";
let uppercase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
let numbers = "0123456789";
let special = "!@#$%^&*()";

The password starts by ensuring at least one lowercase, one uppercase, and one special character

pass += lowercase[Math.floor(Math.random() * lowercase.length)];
pass += uppercase[Math.floor(Math.random() * uppercase.length)];
pass += special[Math.floor(Math.random() * special.length)];

The password starts by ensuring at least one lowercase, one uppercase, and one special character

pass += lowercase[Math.floor(Math.random() * lowercase.length)];
pass += uppercase[Math.floor(Math.random() * uppercase.length)];
pass += special[Math.floor(Math.random() * special.length)];

The remaining characters are filled randomly from all character sets

let allChars = lowercase + uppercase + numbers + special;

The remaining characters are filled randomly from all character sets

let allChars = lowercase + uppercase + numbers + special;

The characters are shuffled to make the password unpredictable:

pass = pass.split("").sort(() => Math.random() - 0.5).join("");

Finally, the generated password is returned and printed:

return pass;

Conclusion:-

This project demonstrates how to use JavaScript Classes and Objects to solve a real-world problem — generating strong passwords. It’s a great exercise in both OOP concepts and string manipulation.
You can enhance it further by:

Adding a password strength meter.

Allowing users to choose what types of characters to include.

Building a simple UI using HTML & CSS.

Password Generator Using Javascript

Password Generator Project using JavaScript

⚙️ Project Objective

Code:-

Explanation:-

Conclusion:-

How did you feel about this post?