How to send JSON object from npm module to browser

Question

How can I send the JSON object "data" returned by the npm module "blockchain.info" in the callback "onRequest". I want to write this data in the browser.

var http = require("http");
var blockchain = require('blockchain.info');
var blockexplorer = blockchain.blockexplorer;

var txAdress = 'b4b69abc03e4a801201e57ca57891002e5e756e85dde77a17deff0b107185a78';

blockexplorer.getTx(txAdress, function (err, data) {
   if (err) return console.error(err);
    console.log(data.size);  // works fine
});

var server = http.createServer(onRequest).listen(8888);

function onRequest(request, response) {
   response.writeHead(200, {"Content-Type": "text/html"});
   response.write('<h3>List of transactions</h3>');
   //response.write('<p>' + data.size + '</p>');  // data undefined!
   response.end();
}

Answer 1

A simple solution for this would be to make the call in the request event handler:

function onRequest(request, response) {

    blockexplorer.getTx(txAdress, function (err, data) {
       if (err) return console.error(err);
       response.writeHead(200, {"Content-Type": "text/html"});
       response.write('<h3>List of transactions</h3>');
       response.write('<p>' + data.size + '</p>');
       response.end();
    });

}