# jack8084/backend architecture

> Architecture diagram of the GitHub repository jack8084/backend, 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/jack8084/backend
- Repository: https://github.com/jack8084/backend

## Overview

This is a small Express API for accepting portfolio contact messages and saving them as user records. The principal workflow is a client POSTing to `/message`, the API delegating persistence, and a success or failure response returning to the client. Startup connects to MongoDB, while the root route provides a health check. The README is empty, so the map reflects only the supplied tree and source excerpts; no validation or additional product capabilities are assumed.

Main entry points: [`main.js`](https://github.com/jack8084/backend/blob/main/main.js) (Express API), [`configs/db.js`](https://github.com/jack8084/backend/blob/main/configs/db.js) (DB connector), [`functions/saveuser.js`](https://github.com/jack8084/backend/blob/main/functions/saveuser.js) (Save user), [`models/schema.js`](https://github.com/jack8084/backend/blob/main/models/schema.js) (User model)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_api["API runtime"]
  node_main["Express API<br/>[main.js]"]
end

subgraph group_persistence["Persistence"]
  node_dbconnect["DB connector<br/>[db.js]"]
  node_saveuser["Save user<br/>[saveuser.js]"]
  node_userschema["User model<br/>[schema.js]"]
end

node_client(("API client"))
node_mongodb[("MongoDB")]

node_client -->|"sends requests"| node_main
node_main -->|"returns response"| node_client
node_main -->|"connects at startup"| node_dbconnect
node_main -->|"delegates message"| node_saveuser
node_saveuser -->|"creates and saves"| node_userschema
node_userschema -->|"persists record"| node_mongodb
node_dbconnect -->|"opens connection"| node_mongodb

click node_main "https://github.com/jack8084/backend/blob/main/main.js"
click node_dbconnect "https://github.com/jack8084/backend/blob/main/configs/db.js"
click node_saveuser "https://github.com/jack8084/backend/blob/main/functions/saveuser.js"
click node_userschema "https://github.com/jack8084/backend/blob/main/models/schema.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_main,node_client toneBlue
class node_dbconnect,node_saveuser,node_userschema,node_mongodb toneAmber
```

## Components

### API runtime

- [Express API](https://github.com/jack8084/backend/blob/main/main.js): `main.js`

### Persistence

- [DB connector](https://github.com/jack8084/backend/blob/main/configs/db.js): `configs/db.js`
- [Save user](https://github.com/jack8084/backend/blob/main/functions/saveuser.js): `functions/saveuser.js`
- [User model](https://github.com/jack8084/backend/blob/main/models/schema.js): `models/schema.js`

### Other components

- **API client**
- **MongoDB**

## Connections

- API client → Express API: sends requests
- Express API → API client: returns response
- Express API → DB connector: connects at startup
- Express API → Save user: delegates message
- Save user → User model: creates and saves
- User model → MongoDB: persists record
- DB connector → MongoDB: opens connection