# ranjithmca17/mern_crud architecture

> Architecture diagram of the GitHub repository ranjithmca17/mern_crud, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-11-14). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/ranjithmca17/mern_crud
- Repository: https://github.com/ranjithmca17/mern_crud

## Overview

This is a product-catalog CRUD application: users browse products, create or edit records, view a product route, and delete records after confirmation. The frontend routes pages through shared product state and service calls to an Express API; API handlers use the Product model for persistence. The graph shows the principal request path and error-handling setup. Some backend details and the view page were not excerpted, so their internal behavior is not expanded beyond documented wiring.

Main entry points: [`Frontend/src/App.tsx`](https://github.com/ranjithmca17/mern_crud/blob/main/Frontend/src/App.tsx) (Route application), [`Frontend/src/context/ProductContext.tsx`](https://github.com/ranjithmca17/mern_crud/blob/main/Frontend/src/context/ProductContext.tsx) (Product state), [`backend/app.js`](https://github.com/ranjithmca17/mern_crud/blob/main/backend/app.js) (Express API setup), [`Frontend/src/Pages/products/ProductListPage.tsx`](https://github.com/ranjithmca17/mern_crud/blob/main/Frontend/src/Pages/products/ProductListPage.tsx) (Product list)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_frontend["Frontend experience"]
  node_app["Route application<br/>[App.tsx]"]
  node_list["Product list"]
  node_create["Create product"]
  node_edit["Edit product"]
  node_view["View product"]
  node_delete_modal["Delete confirmation"]
end

subgraph group_state["Product state and API client"]
  node_provider["Product state<br/>[ProductContext.tsx]"]
  node_types["Product types<br/>[product.types.ts]"]
  node_service["Product service<br/>[productService.ts]"]
  node_http_client["HTTP client<br/>[api.ts]"]
end

subgraph group_backend["Backend API"]
  node_api["Express API setup<br/>[app.js]"]
  node_routes["Product routes<br/>[productRoutes.js]"]
  node_controller["Product handlers"]
  node_not_found["Not-found middleware<br/>[notFound.js]"]
  node_errors["Error handler<br/>[errorHandler.js]"]
  node_server["Server startup<br/>[Server.js]"]
end

subgraph group_persistence["Product persistence"]
  node_db_config["Database connection<br/>[db.js]"]
  node_product_model[("Product model<br/>[Product.js]")]
end

node_user(("Catalog user"))

node_user -->|"uses"| node_app
node_app -->|"routes to"| node_list
node_app -->|"routes to"| node_create
node_app -->|"routes to"| node_edit
node_app -->|"routes to"| node_view
node_list -->|"fetches and deletes"| node_provider
node_list -->|"renders"| node_delete_modal
node_create -->|"creates through"| node_provider
node_edit -->|"loads and updates"| node_provider
node_provider -->|"calls"| node_service
node_provider -->|"uses"| node_types
node_service -->|"sends requests via"| node_http_client
node_http_client -.->|"requests product endpoints"| node_routes
node_server -->|"starts"| node_api
node_server -->|"connects before serving"| node_db_config
node_api -->|"mounts"| node_routes
node_api -->|"registers"| node_not_found
node_api -->|"registers"| node_errors
node_routes -->|"dispatches to"| node_controller
node_controller -->|"queries"| node_product_model
node_not_found -.->|"passes errors to"| node_errors

click node_app "https://github.com/ranjithmca17/mern_crud/blob/main/Frontend/src/App.tsx"
click node_list "https://github.com/ranjithmca17/mern_crud/blob/main/Frontend/src/Pages/products/ProductListPage.tsx"
click node_create "https://github.com/ranjithmca17/mern_crud/blob/main/Frontend/src/Pages/products/CreateProductPage.tsx"
click node_edit "https://github.com/ranjithmca17/mern_crud/blob/main/Frontend/src/Pages/products/EditProductPage.tsx"
click node_view "https://github.com/ranjithmca17/mern_crud/blob/main/Frontend/src/Pages/products/ViewProductPage.tsx"
click node_delete_modal "https://github.com/ranjithmca17/mern_crud/blob/main/Frontend/src/components/DeleteConfirmModal.tsx"
click node_provider "https://github.com/ranjithmca17/mern_crud/blob/main/Frontend/src/context/ProductContext.tsx"
click node_types "https://github.com/ranjithmca17/mern_crud/blob/main/Frontend/src/types/product.types.ts"
click node_service "https://github.com/ranjithmca17/mern_crud/blob/main/Frontend/src/services/productService.ts"
click node_http_client "https://github.com/ranjithmca17/mern_crud/blob/main/Frontend/src/services/api.ts"
click node_api "https://github.com/ranjithmca17/mern_crud/blob/main/backend/app.js"
click node_routes "https://github.com/ranjithmca17/mern_crud/blob/main/backend/src/routes/productRoutes.js"
click node_controller "https://github.com/ranjithmca17/mern_crud/blob/main/backend/src/controllers/productController.js"
click node_not_found "https://github.com/ranjithmca17/mern_crud/blob/main/backend/src/middleware/notFound.js"
click node_errors "https://github.com/ranjithmca17/mern_crud/blob/main/backend/src/middleware/errorHandler.js"
click node_server "https://github.com/ranjithmca17/mern_crud/blob/main/backend/Server.js"
click node_db_config "https://github.com/ranjithmca17/mern_crud/blob/main/backend/src/config/db.js"
click node_product_model "https://github.com/ranjithmca17/mern_crud/blob/main/backend/src/models/Product.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_list,node_create,node_edit,node_view,node_delete_modal,node_user toneBlue
class node_provider,node_types,node_service,node_http_client toneAmber
class node_api,node_routes,node_controller,node_not_found,node_errors,node_server toneMint
class node_db_config,node_product_model toneRose
```

## Components

### Frontend experience

- [Route application](https://github.com/ranjithmca17/mern_crud/blob/main/Frontend/src/App.tsx): `Frontend/src/App.tsx`
- [Product list](https://github.com/ranjithmca17/mern_crud/blob/main/Frontend/src/Pages/products/ProductListPage.tsx): `Frontend/src/Pages/products/ProductListPage.tsx`
- [Create product](https://github.com/ranjithmca17/mern_crud/blob/main/Frontend/src/Pages/products/CreateProductPage.tsx): `Frontend/src/Pages/products/CreateProductPage.tsx`
- [Edit product](https://github.com/ranjithmca17/mern_crud/blob/main/Frontend/src/Pages/products/EditProductPage.tsx): `Frontend/src/Pages/products/EditProductPage.tsx`
- [View product](https://github.com/ranjithmca17/mern_crud/blob/main/Frontend/src/Pages/products/ViewProductPage.tsx): `Frontend/src/Pages/products/ViewProductPage.tsx`
- [Delete confirmation](https://github.com/ranjithmca17/mern_crud/blob/main/Frontend/src/components/DeleteConfirmModal.tsx): `Frontend/src/components/DeleteConfirmModal.tsx`

### Product state and API client

- [Product state](https://github.com/ranjithmca17/mern_crud/blob/main/Frontend/src/context/ProductContext.tsx): `Frontend/src/context/ProductContext.tsx`
- [Product types](https://github.com/ranjithmca17/mern_crud/blob/main/Frontend/src/types/product.types.ts): `Frontend/src/types/product.types.ts`
- [Product service](https://github.com/ranjithmca17/mern_crud/blob/main/Frontend/src/services/productService.ts): `Frontend/src/services/productService.ts`
- [HTTP client](https://github.com/ranjithmca17/mern_crud/blob/main/Frontend/src/services/api.ts): `Frontend/src/services/api.ts`

### Backend API

- [Express API setup](https://github.com/ranjithmca17/mern_crud/blob/main/backend/app.js): `backend/app.js`
- [Product routes](https://github.com/ranjithmca17/mern_crud/blob/main/backend/src/routes/productRoutes.js): `backend/src/routes/productRoutes.js`
- [Product handlers](https://github.com/ranjithmca17/mern_crud/blob/main/backend/src/controllers/productController.js): `backend/src/controllers/productController.js`
- [Not-found middleware](https://github.com/ranjithmca17/mern_crud/blob/main/backend/src/middleware/notFound.js): `backend/src/middleware/notFound.js`
- [Error handler](https://github.com/ranjithmca17/mern_crud/blob/main/backend/src/middleware/errorHandler.js): `backend/src/middleware/errorHandler.js`
- [Server startup](https://github.com/ranjithmca17/mern_crud/blob/main/backend/Server.js): `backend/Server.js`

### Product persistence

- [Database connection](https://github.com/ranjithmca17/mern_crud/blob/main/backend/src/config/db.js): `backend/src/config/db.js`
- [Product model](https://github.com/ranjithmca17/mern_crud/blob/main/backend/src/models/Product.js): `backend/src/models/Product.js`

### Other components

- **Catalog user**

## Connections

- Catalog user → Route application: uses
- Route application → Product list: routes to (evidence: `Frontend/src/App.tsx`)
- Route application → Create product: routes to (evidence: `Frontend/src/App.tsx`)
- Route application → Edit product: routes to (evidence: `Frontend/src/App.tsx`)
- Route application → View product: routes to (evidence: `Frontend/src/App.tsx`)
- Product list → Product state: fetches and deletes (evidence: `Frontend/src/Pages/products/ProductListPage.tsx`)
- Product list → Delete confirmation: renders (evidence: `Frontend/src/Pages/products/ProductListPage.tsx`)
- Create product → Product state: creates through (evidence: `Frontend/src/Pages/products/CreateProductPage.tsx`)
- Edit product → Product state: loads and updates (evidence: `Frontend/src/Pages/products/EditProductPage.tsx`)
- Product state → Product service: calls (evidence: `Frontend/src/context/ProductContext.tsx`)
- Product state → Product types: uses (evidence: `Frontend/src/context/ProductContext.tsx`)
- Product service → HTTP client: sends requests via (evidence: `Frontend/src/services/productService.ts`)
- HTTP client → Product routes: requests product endpoints
- Server startup → Express API setup: starts (evidence: `backend/Server.js`)
- Server startup → Database connection: connects before serving (evidence: `backend/Server.js`)
- Express API setup → Product routes: mounts (evidence: `backend/app.js`)
- Express API setup → Not-found middleware: registers (evidence: `backend/app.js`)
- Express API setup → Error handler: registers (evidence: `backend/app.js`)
- Product routes → Product handlers: dispatches to (evidence: `backend/src/routes/productRoutes.js`)
- Product handlers → Product model: queries (evidence: `backend/src/controllers/productController.js`)
- Not-found middleware → Error handler: passes errors to