Unexpected token u in JSON

undefined:1                                                                                                                                          
function (encoding, start, end) {                                                                                                                    
 ^                                                                                                                                                   

SyntaxError: Unexpected token u in JSON at position 1                                                                                                
    at JSON.parse (<anonymous>)                                                                                                                      
    at IncomingMessage.response.on (/home/treehouse/workspace/app.js:23:30)                                                                          
    at emitNone (events.js:111:20)                                                                                                                   
    at IncomingMessage.emit (events.js:208:7)                                                                                                        
    at endReadableNT (_stream_readable.js:1064:12)                                                                                                   
    at _combinedTickCallback (internal/process/next_tick.js:139:11)                                                                                  
    at process._tickCallback (internal/process/next_tick.js:181:9)  

   // 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

    // Require https module
const https = require('https');
   //username
const username = 'sandi'
   // Function to print message to console
function printMessage(username, badgeCount, points) {
  const message = `${username} has ${badgeCount} badge(s) and ${points} points in JavaScript.`;
  console.log(message);
};

   // Connect to the API URL (https://teamtreehouse.com/username.json)
const request = https.get(`https://teamtreehouse.com/${username}.json`, response => {
      let body = '';   
   // Read the data  
      response.on('data', data => {
        body += data.toString;
        });
      response.on('end', () => {
   // Parse the data
        const profile = JSON.parse(body);
        console.dir(profile);
          });

    // Print the data

});