Why do I keep getting this error?

$ node app.js
C:\Users\Rusie\Documents\susan_treehouse\Node.js_Basics_2017\Getting_the_Respons
e_Body\Stage_2_Video_4_0_start\app.js:16
                                                        let body = "";
                                                        ^^^

SyntaxError: Block-scoped declarations (let, const, function, class) not yet sup
ported outside strict mode
    at exports.runInThisContext (vm.js:53:16)
    at Module._compile (module.js:373:25)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Function.Module.runMain (module.js:441:10)
    at startup (node.js:139:18)
    at node.js:968:3

// 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 outerHTML

// Require https module
const https = require('https');
const username = "chalkers";

//Function to print message to console
function printMessage(username, badgeCount, points) {
    const message = '${username} has ${badgeCount} total 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
                            console.log(body);
                            console.log(typeof body);
                            // Print the data
                            });

                            });
                    ```