Foreach | For loop Javascript - Treehouse API extension. Issue iterating over the loop for pulling and printing an array

The issue is iterating through the array of users. Appreciate the support.

// Problem: We want to track a users progress each week and display their progress on a chart

// Solution: Use node.js to connect to Treehouse's API and get profile data to print out
var https = require("https");

var usernames = ["dillonkavanagh", "seantrant", "briankershaw", "beatrizbarcelos", "troyou", "dalalalshohaib", "matthewberrill", "stephenhackett", "kathleenkelly"];

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

function printStats(usernames, points){
  var messageLoop = usernames + " has " + points + " points in total!";
  console.log(messageLoop);
}

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

// Connect to the API URL's [Handle a database array of usernames] (https://teamtreehouse.com/dillonkavanagh.json
for(var i = 0; i <= usernames.length; i++){

  var request = https.get("https://teamtreehouse.com/" + usernames[i] + ".json", function(res){
  var body = "";
  // console.log(res.statusCode);

  // Read the data
  res.on('data', function(chunk){
    body += chunk;
  });


  res.on('end', function(){
    if(res.statusCode === 200){
      try {

      var profile = JSON.parse(body);
      printStats(usernames[i], profile.points.total)

        } catch(error) {
          // parse error
          printError(error);
        }
    } else {
      // Status Code error
      printError({message: "There was an error getting the profile for " + usernames[i] +  ". (" + http.STATUS_CODES[res.statusCode] +") "});
    }
  });


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

  // Store / Parse relevant data

  // Print data to screen
});

};