V8 comes with a debugger that can be accessed from outside the process by using a TCP protocol. Node comes with a built-in client for the debugger, but we can also add external tools to connect to the debugger—such as node-inspector (https://www.npmjs.org/package/node-inspector).
To showcase the debugger, we will create a sample Express application that contains a bug (not that hard to spot actually). The application will have three endpoints:
/: The main page will assign a random name and e-mail to the session in case they don't already exist, or redirect the user to/whoamiif they are already set/whoami: This is used to check the name and e-mail stored in the session/refresh: This destroys the session and redirects to the main page
The code for this application is as follows:
var express = require('express');
var app = express();
var morgan = require('morgan');
var cookieParser = require('cookie-parser');
var session = require('express...