Transaction Processor

A Node.js application for processing transactions from CSV files with a RESTful API.

Features

• Upload CSV files containing transaction data
• Process transactions and categorize them into accounts and cards
• Identify and store bad transactions (transactions with missing fields)
• Retrieve accounts, cards, and bad transactions via API endpoints
• Reset the system to clear all data
• Secure APIs with CORS and API keys
• Pagination for large datasets

Prerequisites

• Node.js (v14 or higher)
• npm (v6 or higher)

Installation

1. Clone the repository:

   git clone https://github.com/tesla07/processor-interview-ut.git
   cd transaction-processor
   

2. Install dependencies for backend and frontend:

   npm install
   npm install http-server

Usage

1. Start the backend server:

   cd backend
   npm run dev

2. Start the frontend server:

 cd frontend
 http-server

3. Open your browser and navigate to http://localhost:8081 to access the application.

API Endpoints

Upload Transactions: POST /upload

Upload a CSV file containing transaction data.

• Request Body: Use a form with a file input to upload the CSV file.
• Response: Success message or error details.

Get Collections: GET /collections

Retrieve all collections of accounts with negative balance.

Get Bad Transactions: GET /bad-transactions

Retrieve all bad transactions (transactions with missing fields).

Reset System: POST /reset

Clear all data from the system (transactions, cards, and accounts).

• Response: Success message confirming data reset.