gravatar_node.js

/* Load the packages for hashing and HTTP requests (must be installed with npm before) */
var crypto = require("crypto");
var request = require("request");

/* Generate a md5-hash of a email address and return its hexadecimal value */
var hash = crypto.createHash('md5').update("example@hotmail.com").digest("hex");

/* Sends a GET request for the user profile */
request("https://www.gravatar.com/"+hash+".xml",function(err,response,body){
	if (!err){
		console.log(body);
	}else{
		console.log("Error: "+err);
	}
})

/* Sends a GET request for the avatar */
request("https://www.gravatar.com/avatar/"+hash+".jpg",function(err,response,body){
	if (!err){
		console.log("Got image: "+body);
	}else{
		console.log("Error: "+err);
	}
})