Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

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

Saad Khan Malik
Saad Khan Malik
25,199 Points

Property error on "https.STATUS_CODES"

app.js

//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 https = require("https");
var username = "saadkhanmalik123";

//print out message
function printMessage(username, badgeCount, points) {
  var message = username + " has " + badgeCount + " total badge(s) and " + points + " points in JavaScript";
  console.log(message);
}
//print out error messages
function printError(error){
    console.error(error.message);
}
//Connect to the API URL (https://teamtreehouse.com/username.json)
var request = https.get("https://teamtreehouse.com/" + username + ".json", function(response){
  var body = "";
  //Read the data
  response.on('data', function (chunk){
    //console.log('BODY: ' + chunk); // get whole body
    body += chunk;
  });
  response.on('end',function(){
    if (response.statusCode === 200){
      try {
        var profile = JSON.parse(body);
        /*console.dir(profile); //getting all the profile information*/
        printMessage(username, profile.badges.length, profile.points.JavaScript);
      } catch(error) {
        //Pasrse Error Here
        printError(error);
      }
    } else {
      printError({message: "There was an error getting the profile for " + username + ". (" + https.STATUS_CODES[response.statusCode] + ")"});
    }
  });
  //Parse the data
  //Print the data
});

request.on("error", printError);

Console

treehouse:~/workspace$ node app.js                                                       
/home/treehouse/workspace/app.js:38                                                      
or getting the profile for " + username + ".  (" + https.STATUS_CODES[response.           
                                                                                                                    ^                    
TypeError: Cannot read property '404' of undefined                                       
    at IncomingMessage.<anonymous> (/home/treehouse/workspace/app.js:38:113)             
    at IncomingMessage.emit (events.js:129:20)                                           
    at _stream_readable.js:908:16                                                        
    at process._tickCallback (node.js:355:11) 

The carrot point on the opening square bracket.

Thanks in advance!

3 Answers

Seth Kroger
Seth Kroger
56,407 Points

STATUS_CODES is one of the few things node's https doesn't replicate from http, and using https in it's place here is causing the error. You'll need to require http as well as https for that one bit.

Saad Khan Malik
Saad Khan Malik
25,199 Points

thanks, Required the http module.

But what I don't get is how the .get works on https, but "absorbs from" http. If you can help explain that one bit...

FYI the error check on the code is working fine.

//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 https = require("https");
var http =require("http");

//print out message
function printMessage(username, badgeCount, points) {
  var message = username + " has " + badgeCount + " total badge(s) and " + points + " points in JavaScript";
  console.log(message);
}

//print out error messages
function printError(error){
    console.error(error.message);
}

function get(username){

  //Connect to the API URL (https://teamtreehouse.com/username.json)
  var request = https.get("https://teamtreehouse.com/" + username + ".json", function(response){
    var body = "";

    //Read the data
    response.on('data', function (chunk){

      //console.log('BODY: ' + chunk); // get whole body
      body += chunk;
    });
    response.on('end',function(){
      if (response.statusCode === 200){
        try {
          // Parse Data
          var profile = JSON.parse(body);

          /*console.dir(profile); // parsing whole body profile information*/

          //Print Data
          printMessage(username, profile.badges.length, profile.points.JavaScript);

        } catch(error) {

          //Pasrse Error Here
          printError(error);
        }
      } else {
        printError({message: "There was an error getting the profile for " + username + ". (" + http.STATUS_CODES[response.statusCode] + ")"});
      }
    });
  });

  request.on("error", printError);
}
module.exports.get = get;
Sebastian Röder
Sebastian Röder
13,878 Points

There is an easier way to get the status message that does not involve the STATUS_CODES object and works for both http and https: the statusMessage property of the response object.

console.log("Error fetching data for user " + username + ": " + response.statusMessage);

The console output looks like this:

$ node app.js 
GET https://teamtreehouse.com/sebroeder42.json: 404
Error fetching data for user sebroeder42: Not Found
Patrick O'Dacre
Patrick O'Dacre
15,471 Points

This is a nice solution; it eliminates the need to require('http') for just that one status message.

@saadkhanmalik : https is not "absorbing" from http in this case. The call http.STATUS_CODES is separate from your .get request. Hope this helps.