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

Generate Passphrases in JavaScript

Complete code tutorial with examples and best practices

PHP

JavaScript

[ Code Example - Quick Summary ]

Language: JavaScript

What: Generate cryptographically secure passphrases in JavaScript using the Web Crypto API for browsers or the crypto module for Node.js. Perfect for password managers and authentication systems.

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

Generate cryptographically secure passphrases in JavaScript using the Web Crypto API for browsers or the crypto module for Node.js. Perfect for password managers and authentication systems. 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

// Browser and Node.js compatible
function generatePassphrase(wordCount = 6) {
    // EFF's improved wordlist (7776 words)
    const wordlist = ["ability", "able", "about", "above", "accept", /* ... */];

    const words = [];
    const array = new Uint32Array(wordCount);

    // Use crypto.getRandomValues (browser) or crypto.randomBytes (Node)
    if (typeof window !== 'undefined') {
        window.crypto.getRandomValues(array);
    } else {
        const crypto = require('crypto');
        for (let i = 0; i < wordCount; i++) {
            array[i] = crypto.randomInt(0, wordlist.length);
        }
    }

    for (let i = 0; i < wordCount; i++) {
        const index = array[i] % wordlist.length;
        words.push(wordlist[index]);
    }

    return words.join('-');
}

// Generate passphrase
console.log(generatePassphrase(6));
// "crystal-thunder-mountain-freedom-cascade-brilliant"

[EXPLANATION]

This JavaScript implementation uses the Web Crypto API for browsers and Node.js crypto module for server-side generation. The code handles both environments automatically. Using crypto.getRandomValues() ensures cryptographic quality randomness, making passphrases suitable for security-critical applications.

Expected Output

crystal-thunder-mountain-freedom-cascade-brilliant
jupiter-phoenix-quantum-nebula-velocity-eclipse
harmony-starlight-infinite-cosmos-radiant-zenith

Common Use Cases

Browser-based password managers
User registration flows with memorable passwords
Node.js authentication services
Electron app security (master passwords)
Browser extensions for password generation

Important Notes

crypto.getRandomValues() available in all modern browsers
Node.js: use crypto.randomInt() for cleaner code
Modulo bias is negligible with 32-bit random values
Consider async/await for large wordlist loading
Store wordlist in separate file for maintainability

Try Our Interactive Generator

Don't want to write code? Use our free web-based Passphrases generator with instant results.

TRY PASSPHRASES GENERATOR →

Other Programming Languages

PHP $ view --lang=php

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PYTHON $ view --lang=python

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JAVA $ view --lang=java

View Passphrases generation code examples in Java

C# $ view --lang=csharp

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C++ $ view --lang=cpp

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RUBY $ view --lang=ruby

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GO $ view --lang=go

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