Node Script to call Salesforce from external system

var express = require( 'express' );
var http = require( 'http' );
var jsforce = require('jsforce');

var app = express();
app.set( 'port', process.env.PORT || 3011 );
app.get('/', function (req, res) {
var conn = new jsforce.Connection({
// you can change loginUrl to connect to sandbox or prerelease env.
loginUrl : 'https://test.salesforce.com'
});
var username = 'username sandbox';
var password = 'password';
var apexBody = "System.debug('Hello, World');";//This can be changed to call any salesforce logic from anonymous apex. 
conn.login(username, password, function(err, userInfo) {
if (err) { return console.error(err); }

console.log(conn.accessToken);
console.log(conn.instanceUrl);
const conn2 = ({
instanceUrl :conn.instanceUrl,
accessToken :conn.accessToken 
});
conn.tooling.executeAnonymous(apexBody, function(err, res) {
if (err) { return console.error(err); }
console.log("compiled?: " + res.compiled); // compiled successfully
console.log("executed?: " + res.success); // executed successfully
});
// logged in user property
console.log("User ID: " + userInfo.id);
console.log("Org ID: " + userInfo.organizationId);
// ...
res.send('JSForce Connect Successed!');
});
//res.send('Hello World');
});

http.createServer( app ).listen( app.get( 'port' ), function (){
console.log( 'Express server listening on port ' + app.get( 'port' ));
});