Node

This guide will help you create a Node.js script that generates a Gravatar URL based on an email address using the SHA-256 hashing algorithm. This is useful for server-side processing or script-based tasks.

Prerequisites

• Node.js installed on your machine.
• Familiarity with running Node.js scripts.

Step 1: Install Dependencies

Install the crypto library (for SHA-256 hashing) using npm:

npm install crypto

Step 2: Set Up Your Node.js Script

Create a new file named generate-gravatar.js.

Step 3: Script to Generate Gravatar URL

In your generate-gravatar.js, import the crypto library and define the functions to compute the Gravatar URL:

const crypto = require('crypto');

function getGravatarUrl(email, size = 80) {
    const trimmedEmail = email.trim().toLowerCase();
    const hash = crypto.createHash('sha256').update(trimmedEmail).digest('hex');
    return `https://www.gravatar.com/avatar/${hash}?s=${size}&d=identicon`;
}

// Example usage
const email = 'your-email@example.com';
const size = 200; // Optional size parameter
const gravatarUrl = getGravatarUrl(email, size);

console.log('Gravatar URL:', gravatarUrl);

Step 4: Run the Script

Run your script via the command line to see the output:

node generate-gravatar.js

This command will print the Gravatar URL for the email specified in the script. You can change the email or size to test with different parameters.