# mehmoodcoder/mern_projects architecture

> Architecture diagram of the GitHub repository mehmoodcoder/mern_projects, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-11-09). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/mehmoodcoder/mern_projects
- Repository: https://github.com/mehmoodcoder/mern_projects

## Overview

This is a TypeScript MERN user-management CRUD app. A user opens the React SPA, views the user list, and can create, edit, or delete records; the UI sends HTTP requests to Express, whose controllers use a Mongoose model to persist records in MongoDB. The backend startup also connects to the database and mounts the API router. The README documents the CRUD endpoints and Atlas persistence; deployment and build configuration are omitted. Unsampled deployment routing and other README-level capabilities are not mapped as runtime components.

Main entry points: [`CRUD_Project/backend/app.ts`](https://github.com/mehmoodcoder/mern_projects/blob/main/CRUD_Project/backend/app.ts) (API server), [`CRUD_Project/frontend/src/App.tsx`](https://github.com/mehmoodcoder/mern_projects/blob/main/CRUD_Project/frontend/src/App.tsx) (App routes), [`CRUD_Project/frontend/src/main.tsx`](https://github.com/mehmoodcoder/mern_projects/blob/main/CRUD_Project/frontend/src/main.tsx) (React entry), [`CRUD_Project/frontend/src/components/User.tsx`](https://github.com/mehmoodcoder/mern_projects/blob/main/CRUD_Project/frontend/src/components/User.tsx) (User list)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_frontend["React frontend"]
  node_entry["React entry<br/>[main.tsx]"]
  node_app["App routes<br/>[App.tsx]"]
  node_list["User list<br/>[User.tsx]"]
  node_create["Create form<br/>[CreateUser.tsx]"]
  node_edit["Update form<br/>[UpdateUser.tsx]"]
end

subgraph group_api["Express API"]
  node_server["API server<br/>[app.ts]"]
  node_routes["CRUD routes<br/>[static.ts]"]
  node_handlers["User controllers<br/>[static.ts]"]
end

subgraph group_persistence["Data persistence"]
  node_connection["DB connection<br/>[connection.ts]"]
  node_user_model["User model<br/>[user.ts]"]
end

node_visitor(("User"))
node_mongodb[("MongoDB")]

node_visitor -->|"uses"| node_entry
node_entry -->|"renders"| node_app
node_app -->|"routes to"| node_list
node_app -->|"routes to"| node_create
node_app -->|"routes to"| node_edit
node_list -->|"GET, DELETE"| node_server
node_create -->|"POST"| node_server
node_edit -->|"GET, PUT"| node_server
node_server -->|"mounts API"| node_routes
node_server -->|"connects"| node_connection
node_routes -->|"dispatches"| node_handlers
node_handlers -->|"queries"| node_user_model
node_connection -->|"connects"| node_mongodb
node_user_model -.->|"persists users"| node_mongodb

click node_entry "https://github.com/mehmoodcoder/mern_projects/blob/main/CRUD_Project/frontend/src/main.tsx"
click node_app "https://github.com/mehmoodcoder/mern_projects/blob/main/CRUD_Project/frontend/src/App.tsx"
click node_list "https://github.com/mehmoodcoder/mern_projects/blob/main/CRUD_Project/frontend/src/components/User.tsx"
click node_create "https://github.com/mehmoodcoder/mern_projects/blob/main/CRUD_Project/frontend/src/components/CreateUser.tsx"
click node_edit "https://github.com/mehmoodcoder/mern_projects/blob/main/CRUD_Project/frontend/src/components/UpdateUser.tsx"
click node_server "https://github.com/mehmoodcoder/mern_projects/blob/main/CRUD_Project/backend/app.ts"
click node_routes "https://github.com/mehmoodcoder/mern_projects/blob/main/CRUD_Project/backend/routes/static.ts"
click node_handlers "https://github.com/mehmoodcoder/mern_projects/blob/main/CRUD_Project/backend/controllers/static.ts"
click node_connection "https://github.com/mehmoodcoder/mern_projects/blob/main/CRUD_Project/backend/connection.ts"
click node_user_model "https://github.com/mehmoodcoder/mern_projects/blob/main/CRUD_Project/backend/models/user.ts"

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_entry,node_app,node_list,node_create,node_edit,node_visitor toneBlue
class node_server,node_routes,node_handlers,node_mongodb toneAmber
class node_connection,node_user_model toneMint
```

## Components

### React frontend

- [React entry](https://github.com/mehmoodcoder/mern_projects/blob/main/CRUD_Project/frontend/src/main.tsx): `CRUD_Project/frontend/src/main.tsx`
- [App routes](https://github.com/mehmoodcoder/mern_projects/blob/main/CRUD_Project/frontend/src/App.tsx): `CRUD_Project/frontend/src/App.tsx`
- [User list](https://github.com/mehmoodcoder/mern_projects/blob/main/CRUD_Project/frontend/src/components/User.tsx): `CRUD_Project/frontend/src/components/User.tsx`
- [Create form](https://github.com/mehmoodcoder/mern_projects/blob/main/CRUD_Project/frontend/src/components/CreateUser.tsx): `CRUD_Project/frontend/src/components/CreateUser.tsx`
- [Update form](https://github.com/mehmoodcoder/mern_projects/blob/main/CRUD_Project/frontend/src/components/UpdateUser.tsx): `CRUD_Project/frontend/src/components/UpdateUser.tsx`

### Express API

- [API server](https://github.com/mehmoodcoder/mern_projects/blob/main/CRUD_Project/backend/app.ts): `CRUD_Project/backend/app.ts`
- [CRUD routes](https://github.com/mehmoodcoder/mern_projects/blob/main/CRUD_Project/backend/routes/static.ts): `CRUD_Project/backend/routes/static.ts`
- [User controllers](https://github.com/mehmoodcoder/mern_projects/blob/main/CRUD_Project/backend/controllers/static.ts): `CRUD_Project/backend/controllers/static.ts`

### Data persistence

- [DB connection](https://github.com/mehmoodcoder/mern_projects/blob/main/CRUD_Project/backend/connection.ts): `CRUD_Project/backend/connection.ts`
- [User model](https://github.com/mehmoodcoder/mern_projects/blob/main/CRUD_Project/backend/models/user.ts): `CRUD_Project/backend/models/user.ts`

### Other components

- **User**
- **MongoDB**

## Connections

- User → React entry: uses
- React entry → App routes: renders (evidence: `CRUD_Project/frontend/src/main.tsx`)
- App routes → User list: routes to (evidence: `CRUD_Project/frontend/src/App.tsx`)
- App routes → Create form: routes to (evidence: `CRUD_Project/frontend/src/App.tsx`)
- App routes → Update form: routes to (evidence: `CRUD_Project/frontend/src/App.tsx`)
- User list → API server: GET, DELETE (evidence: `README.md`)
- Create form → API server: POST (evidence: `README.md`)
- Update form → API server: GET, PUT (evidence: `README.md`)
- API server → CRUD routes: mounts API (evidence: `CRUD_Project/backend/app.ts`)
- API server → DB connection: connects (evidence: `CRUD_Project/backend/app.ts`)
- CRUD routes → User controllers: dispatches (evidence: `CRUD_Project/backend/routes/static.ts`)
- User controllers → User model: queries (evidence: `CRUD_Project/backend/controllers/static.ts`)
- DB connection → MongoDB: connects (evidence: `CRUD_Project/backend/connection.ts`)
- User model → MongoDB: persists users (evidence: `README.md`)