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Full Stack AI Invoicing & Billing App with PERN Stack

Build a full-stack AI Invoicing & Billing application with the PERN stack. Create, send and track invoices, auto-fill line items with Google Gemini AI, generate payment reminders, and manage clients — with JWT auth, PostgreSQL, Express, and a clean React + Tailwind dashboard. Full source code included.

PostgreSQLExpressReactNode.jsGemini APIJWTTailwind
Get Source Code — $13Watch on YouTube
Full Stack AI Invoicing & Billing App with PERN Stack tutorial
1h 1m

What You'll Build

Create, edit & send professional invoices
AI-generated line items & payment reminders (Gemini)
Client and billing management
Paid / pending / overdue tracking dashboard
Revenue & payment analytics
JWT authentication & protected routes
PostgreSQL data model with an Express REST API
Responsive React + Tailwind UI

What You'll Learn

Building a full-stack PERN app end to end
Integrating Google Gemini AI into a real product
Designing a PostgreSQL schema for billing
Express REST API with auth middleware
JWT authentication flow
State management for complex invoice forms

Video Chapters

0:00Demo of the AI Invoice & Billing AppChapter 1
11:04Cloning the UI Boilerplate from GitHubChapter 2
12:54Running the App with Mock DataChapter 3
13:43Backend Setup, Neon PostgreSQL & Database SchemaChapter 4
18:40Core Utilities & Server Boot (Express, middleware, error handling)Chapter 5
27:15Authentication APIs (Register, Login, Get Me) + cookie/JWT middlewareChapter 6
32:45Clients CRUD APIsChapter 7
35:30Invoices APIs (line items, totals & status in a transaction)Chapter 8
39:29Dashboard & Reports APIs (SQL aggregations, aging report)Chapter 9
42:16Settings & Services Catalog APIsChapter 10
44:07Expenses & Payments APIs (auto-reconciling invoices)Chapter 11
47:12AI Features with Google Gemini (Receipt Scan, Summary, Reminders, Notes)Chapter 12
52:36Seeding Demo DataChapter 13
55:17Connecting the Frontend to the Real APIChapter 14
57:25Final End-to-End WalkthroughChapter 15

Tech Stack

PostgreSQLRelational database storing invoices, clients and billing in a normalized SQL schema.
ExpressPowers the REST API — authentication, CRUD routes and business logic.
ReactBuilds the interactive dashboard UI and all client-side state.
Node.jsServer runtime that runs the Express API and connects to the database.
Gemini APIGoogle's LLM powering the app's AI features.
JWTSecures API routes with token-based authentication.
TailwindUtility-first CSS for a clean, responsive interface.
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Frequently Asked Questions

What will I build in this tutorial?

A complete full-stack AI invoicing and billing app with the PERN stack — create and send invoices, manage clients, auto-fill line items and payment reminders with Google Gemini, and track paid, pending and overdue amounts on a live dashboard.

Do I get the full source code?

Yes. The complete frontend and backend source code is included via Buy Me a Coffee, along with a .env setup guide, a commented codebase and deployment instructions.

Is the YouTube tutorial free?

Yes — the full step-by-step build is free on YouTube. The paid download gives you the finished source code so you can run, study and customise it instantly.

What tech stack does it use?

PostgreSQL, Express, React and Node.js (the PERN stack) with Google Gemini AI, JWT authentication and Tailwind CSS.