Build a Personal Expense Tracker with Codex #2 | Express API, Routes, Controllers & Postman Testing
In Phase 2 of the Personal Expense Tracker series, we continue building our backend using a structured AI-assisted workflow.
This time we use a second carefully scoped Codex prompt to generate a scalable Express API architecture instead of dumping everything into a single file.
GitHub: https://github.com/AppSoloTech/expens...
In this video we:
Build an Express.js backend API
Create transaction endpoints
Create category endpoints
Separate routes and controllers
Organize the project for future scalability
Install and configure Postman
Test API endpoints step-by-step
Verify CRUD functionality against PostgreSQL
This episode is a great introduction to proper backend structure and API testing for beginners moving into real full-stack development.
Tech Stack
Node.js
Express.js
PostgreSQL
Postman
Codex
pg-promise
What You'll Learn
REST API basics
Route/controller separation
API testing workflows
Backend project organization
Practical AI-assisted development
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