# abhinav7682/lambda architecture

> Architecture diagram of the GitHub repository abhinav7682/lambda, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-09-25). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/abhinav7682/lambda
- Repository: https://github.com/abhinav7682/lambda

## Overview

Lambda is a small e-commerce storefront with a browser UI, Express API, and SQLite product inventory. The shopper browses products, adds items to a cart, and submits checkout; the API validates stock and updates it transactionally. The frontend also supports mock product data, but the sampled code does not show enough checkout details to map its precise UI states or request payload construction. The README provides no further product capabilities.

Main entry points: [`frontend/app.js`](https://github.com/abhinav7682/lambda/blob/main/frontend/app.js) (Storefront UI), [`index.js`](https://github.com/abhinav7682/lambda/blob/main/index.js) (Product and checkout routes), [`ecommerce.db`](https://github.com/abhinav7682/lambda/blob/main/ecommerce.db) (Product inventory)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_storefront["Storefront"]
  node_frontend["Storefront UI<br/>[app.js]"]
  node_cart["Cart interactions<br/>[app.js]"]
  node_catalog["Catalog display<br/>[app.js]"]
  node_checkout["Checkout submission<br/>[app.js]"]
end

subgraph group_api["Commerce API"]
  node_static["Static hosting<br/>[index.js]"]
  node_config["Runtime config<br/>[index.js]"]
  node_api_routes["Product and checkout routes<br/>[index.js]"]
end

subgraph group_inventory["Inventory"]
  node_sqlite[("Product inventory<br/>[ecommerce.db]")]
end

node_shopper(("Shopper"))

node_shopper -->|"uses"| node_frontend
node_static -->|"serves files"| node_frontend
node_frontend -->|"loads config"| node_config
node_frontend -->|"renders products"| node_catalog
node_frontend -->|"updates cart"| node_cart
node_frontend -->|"submits checkout"| node_checkout
node_catalog -->|"fetches products"| node_api_routes
node_checkout -->|"posts checkout"| node_api_routes
node_api_routes -->|"reads products"| node_sqlite
node_api_routes -->|"checks and updates stock"| node_sqlite

click node_frontend "https://github.com/abhinav7682/lambda/blob/main/frontend/app.js"
click node_static "https://github.com/abhinav7682/lambda/blob/main/index.js"
click node_config "https://github.com/abhinav7682/lambda/blob/main/index.js"
click node_api_routes "https://github.com/abhinav7682/lambda/blob/main/index.js"
click node_cart "https://github.com/abhinav7682/lambda/blob/main/frontend/app.js"
click node_catalog "https://github.com/abhinav7682/lambda/blob/main/frontend/app.js"
click node_checkout "https://github.com/abhinav7682/lambda/blob/main/frontend/app.js"
click node_sqlite "https://github.com/abhinav7682/lambda/blob/main/ecommerce.db"

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_frontend,node_cart,node_catalog,node_checkout toneBlue
class node_static,node_config,node_api_routes toneAmber
class node_sqlite toneMint
class node_shopper toneIndigo
```

## Components

### Storefront

- [Storefront UI](https://github.com/abhinav7682/lambda/blob/main/frontend/app.js): `frontend/app.js`
- [Cart interactions](https://github.com/abhinav7682/lambda/blob/main/frontend/app.js): `frontend/app.js`
- [Catalog display](https://github.com/abhinav7682/lambda/blob/main/frontend/app.js): `frontend/app.js`
- [Checkout submission](https://github.com/abhinav7682/lambda/blob/main/frontend/app.js): `frontend/app.js`

### Commerce API

- [Static hosting](https://github.com/abhinav7682/lambda/blob/main/index.js): `index.js`
- [Runtime config](https://github.com/abhinav7682/lambda/blob/main/index.js): `index.js`
- [Product and checkout routes](https://github.com/abhinav7682/lambda/blob/main/index.js): `index.js`

### Inventory

- [Product inventory](https://github.com/abhinav7682/lambda/blob/main/ecommerce.db): `ecommerce.db`

### Other components

- **Shopper**

## Connections

- Shopper → Storefront UI: uses
- Static hosting → Storefront UI: serves files
- Storefront UI → Runtime config: loads config
- Storefront UI → Catalog display: renders products
- Storefront UI → Cart interactions: updates cart
- Storefront UI → Checkout submission: submits checkout
- Catalog display → Product and checkout routes: fetches products
- Checkout submission → Product and checkout routes: posts checkout
- Product and checkout routes → Product inventory: reads products
- Product and checkout routes → Product inventory: checks and updates stock