MERN Invoice Web App with Docker,NGINX and ReduxToolkit

Create a working directory and initialize git, then set up a new gitHub repository for the invoice app, configure node and npm versions, and generate a .gitignore for the project.

Initialize the project with npm to create a package.json, create a backend folder and .env file, install express and mongoose, and scaffold server.js using ECMAScript modules.

Learn logging in Node.js with Morgan and Winston, understand NPM logging levels from error to silly, and use logs for tracing, http transactions, and debugging with stack traces.

Learn how nginx acts as a reverse proxy and load balancer to route frontend and backend requests, enable https encryption, and support path-based routing for single-port production.

Set up the mern invoice app backend with nginx alpine by creating a dockerfile, defining upstream api port 1997 and client port 3000, and configuring proxy rules and websocket support.

Configure the backend database connection in the config directory's connect db.js using mongoose and env vars, then wire into server.js and install node mailer, express mongo sanitize, and validator.

Implement role-based access and authentication middlewares using JWT, with JSON error handling, not found routing, and API plus login rate limiters to secure the MERN app.

Distinguish authentication from authorization, then examine access and refresh tokens, JWTs, and token rotation with reuse detection to secure API calls and user sessions.

Learn to implement a refresh token controller that issues new access tokens, rotates refresh tokens, deletes old tokens, and detects token reuse to secure authentication.

Master resending of email verification tokens for tokens that expire after 15 minutes in a mern app, including backend controller logic, crypto-based token generation, and sending verification links by email.