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JavaScript Node.js Basics (2014) Building a Command Line Application Handling Parsing and Status Code Errors

Jamie McDonald
Jamie McDonald
5,632 Points

Where/when is the get request sent in this Node.js basics program?

I am reasonably new to JavaScript and I decided to give the Node.js Basics course a go after doing most of the JavaScript content.

I can understand how all of the code works, but I can't work out where the AJAX 'get' request is actually run/sent. As far as I can tell, the entire AJAX request is stored in a variable and the only function that is run is the 'request.on("error"...' event handler.

Am I missing something here, or does Node.js run differently in this context to normal JavaScript?

// Problem: We need a simple way to look at a user's badge count and JavaScript points
// Solution: Use Node.js to connect to Treehouse's API to get profile information to print out

var http = require("http");
var username = "jamiemcdonald";

// Print out error messages
function printError(error) {

function printMessage(username, badgeCount, points) {
  var message = username + " has " + badgeCount + " total badge(s) and " + points + " points in JavaScript";

// Connect to the API URL (https://teamtreehouse.com/username.json)
var request = http.get("http://teamtreehouse.com/" + username + ".json", function(response) {
  var body = "";
  // Read the data
  response.on('data', function (chunk) {
    body += chunk;
  response.on("end", function() {
    if(response.statusCode === 200) {
      try {
        var profile = JSON.parse(body);
        printMessage(username, profile.badges.length, profile.points.JavaScript)
      } catch(error) {
        // Parse Error
    } else {
      //Status Code Error
      printError({message: "There was an error getting the profile for " + username + ". (" + http.STATUS_CODES[response.statusCode] + ")"});
  // Parse the data
  // Print the data  

// Connection Error
request.on("error", printError);

1 Answer

Tom Sager
Tom Sager
18,987 Points

http.get is a method that creates the GET request. "response" is what is returned from the server.