Banking Sample App

This repository contains a simple banking-style web application used as a target system for my automation frameworks.
It provides basic login, accounts, and internal transfer functionality, plus supporting APIs.

The goal of this project is to have a realistic but lightweight banking app that I fully control, so I can design and run end-to-end automation (UI + API + data validation) without relying on external demos.

Tech Stack

• Backend: Node.js, Express (server.js)
• Frontend: React (under banking-sample-app/ and public/)
• Data: In-memory data model for accounts and transfers (no external DB), for simplicity
• API: REST-style endpoints for:
  • user login
  • fetching accounts and balances
  • creating internal transfers

Main Features

• Authentication

  • Basic login flow with validation and error messages.

• Accounts

  • List of user accounts with current balances.
  • Simple invariants: total funds across accounts remain conserved.

• Transfers

  • Internal transfer between accounts:
    • positive scenarios: valid source/target, sufficient funds
    • negative scenarios: insufficient funds, invalid accounts, invalid amounts

These behaviors are used by my Playwright automation projects to verify UI flows and API responses:

• Banking-app-Playwright-Typescript
• treasury-payments-e2e_python

Getting Started

Prerequisites

• Node.js (v18+ recommended)
• npm

Install Dependencies

npm install

Run the App

npm start
By default the app runs on http://localhost:3000 (or as configured in server.js / .env).

Usage in Automation
This app is intentionally small and focused:

UI flows (login → view accounts → make transfer) are exercised by Playwright UI tests.
API endpoints are exercised by Playwright API tests or other HTTP clients.
Balances and transfer rules are used to implement invariant-based assertions (e.g., total funds do not change).
This makes it a good sandbox for demonstrating end-to-end automation design for banking-style systems.