# herman1908/pos_rw architecture

> Architecture diagram of the GitHub repository herman1908/pos_rw, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-09-27). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/herman1908/pos_rw
- Repository: https://github.com/herman1908/pos_rw

## Overview

Alfamart POS is a browser-based retail checkout and inventory system backed by an Express API and MySQL. A cashier uses the frontend to browse products, build a cart, and submit payment; the backend validates and records the transaction, then updates stock. The same API supports product and category management, restocking, transaction history, and sales reports. The README documents these capabilities; sampled backend excerpts show route handlers querying through the shared database pool, but do not establish detailed frontend wiring or all transaction internals.

Main entry points: [`backend/server.js`](https://github.com/herman1908/pos_rw/blob/main/backend/server.js) (Express API), [`backend/db.js`](https://github.com/herman1908/pos_rw/blob/main/backend/db.js) (MySQL Pool), [`frontend/index.html`](https://github.com/herman1908/pos_rw/blob/main/frontend/index.html) (POS Interface)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_ui["Cashier Interface"]
  node_pos_ui["POS Interface<br/>[index.html]"]
  node_catalog_ui["Product Management<br/>[index.html]"]
  node_history_ui["History &amp; Reports<br/>[index.html]"]
end

subgraph group_api["API Workflows"]
  node_api_server["Express API<br/>[server.js]"]
  node_checkout["Checkout &amp; Sales<br/>[server.js]"]
  node_products["Product Catalog<br/>[server.js]"]
  node_categories["Categories<br/>[server.js]"]
  node_restock["Restocking<br/>[server.js]"]
  node_transaction_history["Transaction History<br/>[server.js]"]
  node_reports["Sales Reports<br/>[server.js]"]
  node_stock_logs["Stock Logs<br/>[server.js]"]
end

subgraph group_persistence["Data Persistence"]
  node_db_pool["MySQL Pool<br/>[db.js]"]
  node_mysql[("MySQL Database")]
end

node_cashier(("Cashier"))

node_cashier -->|"uses"| node_pos_ui
node_cashier -->|"manages"| node_catalog_ui
node_cashier -->|"reviews"| node_history_ui
node_pos_ui -->|"requests checkout"| node_api_server
node_catalog_ui -->|"requests changes"| node_api_server
node_history_ui -->|"requests records"| node_api_server
node_api_server -->|"dispatches"| node_checkout
node_api_server -->|"dispatches"| node_products
node_api_server -->|"dispatches"| node_categories
node_api_server -->|"dispatches"| node_restock
node_api_server -->|"dispatches"| node_transaction_history
node_api_server -->|"dispatches"| node_reports
node_api_server -->|"dispatches"| node_stock_logs
node_checkout -->|"queries"| node_db_pool
node_products -->|"queries"| node_db_pool
node_categories -->|"queries"| node_db_pool
node_restock -->|"queries"| node_db_pool
node_transaction_history -->|"queries"| node_db_pool
node_reports -->|"queries"| node_db_pool
node_stock_logs -->|"queries"| node_db_pool
node_db_pool -->|"reads and writes"| node_mysql

click node_pos_ui "https://github.com/herman1908/pos_rw/blob/main/frontend/index.html"
click node_catalog_ui "https://github.com/herman1908/pos_rw/blob/main/frontend/index.html"
click node_history_ui "https://github.com/herman1908/pos_rw/blob/main/frontend/index.html"
click node_api_server "https://github.com/herman1908/pos_rw/blob/main/backend/server.js"
click node_checkout "https://github.com/herman1908/pos_rw/blob/main/backend/server.js"
click node_products "https://github.com/herman1908/pos_rw/blob/main/backend/server.js"
click node_categories "https://github.com/herman1908/pos_rw/blob/main/backend/server.js"
click node_restock "https://github.com/herman1908/pos_rw/blob/main/backend/server.js"
click node_transaction_history "https://github.com/herman1908/pos_rw/blob/main/backend/server.js"
click node_reports "https://github.com/herman1908/pos_rw/blob/main/backend/server.js"
click node_stock_logs "https://github.com/herman1908/pos_rw/blob/main/backend/server.js"
click node_db_pool "https://github.com/herman1908/pos_rw/blob/main/backend/db.js"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_pos_ui,node_catalog_ui,node_history_ui toneBlue
class node_api_server,node_checkout,node_products,node_categories,node_restock,node_transaction_history,node_reports,node_stock_logs toneAmber
class node_db_pool,node_mysql toneMint
class node_cashier toneIndigo
```

## Components

### Cashier Interface

- [POS Interface](https://github.com/herman1908/pos_rw/blob/main/frontend/index.html): `frontend/index.html`
- [Product Management](https://github.com/herman1908/pos_rw/blob/main/frontend/index.html): `frontend/index.html`
- [History & Reports](https://github.com/herman1908/pos_rw/blob/main/frontend/index.html): `frontend/index.html`

### API Workflows

- [Express API](https://github.com/herman1908/pos_rw/blob/main/backend/server.js): `backend/server.js`
- [Checkout & Sales](https://github.com/herman1908/pos_rw/blob/main/backend/server.js): `backend/server.js`
- [Product Catalog](https://github.com/herman1908/pos_rw/blob/main/backend/server.js): `backend/server.js`
- [Categories](https://github.com/herman1908/pos_rw/blob/main/backend/server.js): `backend/server.js`
- [Restocking](https://github.com/herman1908/pos_rw/blob/main/backend/server.js): `backend/server.js`
- [Transaction History](https://github.com/herman1908/pos_rw/blob/main/backend/server.js): `backend/server.js`
- [Sales Reports](https://github.com/herman1908/pos_rw/blob/main/backend/server.js): `backend/server.js`
- [Stock Logs](https://github.com/herman1908/pos_rw/blob/main/backend/server.js): `backend/server.js`

### Data Persistence

- [MySQL Pool](https://github.com/herman1908/pos_rw/blob/main/backend/db.js): `backend/db.js`
- **MySQL Database**

### Other components

- **Cashier**

## Connections

- Cashier → POS Interface: uses
- Cashier → Product Management: manages
- Cashier → History & Reports: reviews
- POS Interface → Express API: requests checkout
- Product Management → Express API: requests changes
- History & Reports → Express API: requests records
- Express API → Checkout & Sales: dispatches
- Express API → Product Catalog: dispatches
- Express API → Categories: dispatches
- Express API → Restocking: dispatches
- Express API → Transaction History: dispatches
- Express API → Sales Reports: dispatches
- Express API → Stock Logs: dispatches
- Checkout & Sales → MySQL Pool: queries
- Product Catalog → MySQL Pool: queries
- Categories → MySQL Pool: queries
- Restocking → MySQL Pool: queries
- Transaction History → MySQL Pool: queries
- Sales Reports → MySQL Pool: queries
- Stock Logs → MySQL Pool: queries
- MySQL Pool → MySQL Database: reads and writes