root@generate-random:~/passwords/javascript$ _

Generate Random Passwords in JavaScript

Complete code tutorial with examples and best practices

PHP

JavaScript

[ Code Example - Quick Summary ]

Language: JavaScript

What: Generate secure random passwords in JavaScript using <code>crypto.getRandomValues()</code> for cryptographically secure random values. Works in both browsers and Node.js.

Try it: Use our interactive Passwords generator or integrate this code into your JavaScript application.

Generate secure random passwords in JavaScript using crypto.getRandomValues() for cryptographically secure random values. Works in both browsers and Node.js. Looking for other languages? Check our code examples in PHP , Python , Java , C# , C++ , Ruby and Go or use our interactive web generator.

JavaScript Code Example

function generatePassword(length = 16, includeSpecial = true) {
    const lowercase = 'abcdefghijklmnopqrstuvwxyz';
    const uppercase = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
    const numbers = '0123456789';
    const special = '!@#$%^&*()-_=+[]{}|;:,.<>?';

    let chars = lowercase + uppercase + numbers;
    if (includeSpecial) {
        chars += special;
    }

    const array = new Uint32Array(length);
    crypto.getRandomValues(array);

    let password = '';
    for (let i = 0; i < length; i++) {
        password += chars[array[i] % chars.length];
    }

    return password;
}

// Generate a 16-character password with special characters
const password = generatePassword(16, true);
console.log(password);  // Example: aB3$xY7!mN2@pQ9&

// Generate a 12-character password without special characters
const simplePassword = generatePassword(12, false);
console.log(simplePassword);  // Example: aB3xY7mN2pQ9

[EXPLANATION]

This function uses crypto.getRandomValues() to generate cryptographically secure random numbers. The modulo operator ensures uniform distribution across the character set. This method works in modern browsers and Node.js (15.6+).