# crkr-dev/simple-deployment-app architecture

> Architecture diagram of the GitHub repository crkr-dev/simple-deployment-app, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-09-30). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/crkr-dev/simple-deployment-app
- Repository: https://github.com/crkr-dev/simple-deployment-app

## Overview

Simple Deployment App lets users create and view user records. The main workflow starts in the React UI, sends requests to the Express API, validates and dispatches them through controller and service layers, and persists records in MongoDB. The README also names Docker, Nginx, AWS, and GitHub Actions as part of the deployment stack, but the available evidence does not establish their runtime wiring, so they are not represented as connected product components.

Main entry points: [`backend/server.js`](https://github.com/crkr-dev/simple-deployment-app/blob/main/backend/server.js) (Express server), [`frontend/src/App.jsx`](https://github.com/crkr-dev/simple-deployment-app/blob/main/frontend/src/App.jsx) (User app), [`backend/routes/userRoutes.js`](https://github.com/crkr-dev/simple-deployment-app/blob/main/backend/routes/userRoutes.js) (User routes), [`backend/controllers/userController.js`](https://github.com/crkr-dev/simple-deployment-app/blob/main/backend/controllers/userController.js) (User controller)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_ui["User interface"]
  node_app["User app<br/>[App.jsx]"]
  node_entry["React entry<br/>[main.jsx]"]
end

subgraph group_api["API handling"]
  node_server["Express server<br/>[server.js]"]
  node_routes["User routes<br/>[userRoutes.js]"]
  node_controller["User controller<br/>[userController.js]"]
  node_service["User service<br/>[userService.js]"]
end

subgraph group_data["User data"]
  node_model["User model<br/>[User.js]"]
  node_database[("MongoDB")]
  node_connection["DB connection<br/>[db.js]"]
end

node_visitor(("Visitor"))

node_visitor -->|"uses"| node_app
node_entry -->|"renders"| node_app
node_app -.->|"requests users"| node_server
node_server -->|"mounts routes"| node_routes
node_routes -->|"dispatches"| node_controller
node_controller -->|"calls"| node_service
node_service -->|"queries"| node_model
node_model -.->|"stores records"| node_database
node_server -->|"connects via"| node_connection
node_connection -->|"connects"| node_database

click node_app "https://github.com/crkr-dev/simple-deployment-app/blob/main/frontend/src/App.jsx"
click node_entry "https://github.com/crkr-dev/simple-deployment-app/blob/main/frontend/src/main.jsx"
click node_server "https://github.com/crkr-dev/simple-deployment-app/blob/main/backend/server.js"
click node_routes "https://github.com/crkr-dev/simple-deployment-app/blob/main/backend/routes/userRoutes.js"
click node_controller "https://github.com/crkr-dev/simple-deployment-app/blob/main/backend/controllers/userController.js"
click node_service "https://github.com/crkr-dev/simple-deployment-app/blob/main/backend/services/userService.js"
click node_model "https://github.com/crkr-dev/simple-deployment-app/blob/main/backend/models/User.js"
click node_connection "https://github.com/crkr-dev/simple-deployment-app/blob/main/backend/config/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_app,node_entry toneBlue
class node_server,node_routes,node_controller,node_service toneAmber
class node_model,node_database,node_connection toneMint
class node_visitor toneIndigo
```

## Components

### User interface

- [User app](https://github.com/crkr-dev/simple-deployment-app/blob/main/frontend/src/App.jsx): `frontend/src/App.jsx`
- [React entry](https://github.com/crkr-dev/simple-deployment-app/blob/main/frontend/src/main.jsx): `frontend/src/main.jsx`

### API handling

- [Express server](https://github.com/crkr-dev/simple-deployment-app/blob/main/backend/server.js): `backend/server.js`
- [User routes](https://github.com/crkr-dev/simple-deployment-app/blob/main/backend/routes/userRoutes.js): `backend/routes/userRoutes.js`
- [User controller](https://github.com/crkr-dev/simple-deployment-app/blob/main/backend/controllers/userController.js): `backend/controllers/userController.js`
- [User service](https://github.com/crkr-dev/simple-deployment-app/blob/main/backend/services/userService.js): `backend/services/userService.js`

### User data

- [User model](https://github.com/crkr-dev/simple-deployment-app/blob/main/backend/models/User.js): `backend/models/User.js`
- **MongoDB**
- [DB connection](https://github.com/crkr-dev/simple-deployment-app/blob/main/backend/config/db.js): `backend/config/db.js`

### Other components

- **Visitor**

## Connections

- Visitor → User app: uses (evidence: `frontend/src/App.jsx`)
- React entry → User app: renders (evidence: `frontend/src/main.jsx`)
- User app → Express server: requests users
- Express server → User routes: mounts routes (evidence: `backend/server.js`)
- User routes → User controller: dispatches (evidence: `backend/routes/userRoutes.js`)
- User controller → User service: calls (evidence: `backend/controllers/userController.js`)
- User service → User model: queries (evidence: `backend/services/userService.js`)
- User model → MongoDB: stores records
- Express server → DB connection: connects via (evidence: `backend/server.js`)
- DB connection → MongoDB: connects (evidence: `backend/config/db.js`)