# mohithbanka/online-auction-platform architecture

> Architecture diagram of the GitHub repository mohithbanka/online-auction-platform, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-09-26). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/mohithbanka/online-auction-platform
- Repository: https://github.com/mohithbanka/online-auction-platform

## Overview

Online Auction Platform is a buyer/seller marketplace for creating auctions, browsing listings, bidding, and tracking outcomes. Users enter through the React app, which provides role-gated screens and live-update context; the Express server exposes authentication, auction, bid, cart, notification, and user APIs. A timed server task closes expired auctions, records winners, and emits outcome notifications. The README also describes bid history and checkout-related capabilities. Server implementation evidence is sampled only in part, so links from unsampled API modules to specific models are omitted.

Main entry points: [`client/src/App.jsx`](https://github.com/mohithbanka/online-auction-platform/blob/main/client/src/App.jsx) (React app), [`server/server.js`](https://github.com/mohithbanka/online-auction-platform/blob/main/server/server.js) (Express and sockets), [`client/src/context/AuthContext.jsx`](https://github.com/mohithbanka/online-auction-platform/blob/main/client/src/context/AuthContext.jsx) (Auth context), [`client/src/context/SocketContext.jsx`](https://github.com/mohithbanka/online-auction-platform/blob/main/client/src/context/SocketContext.jsx) (Live updates)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_client["Web application"]
  node_app["React app<br/>[App.jsx]"]
  node_authctx["Auth context<br/>[AuthContext.jsx]"]
  node_socketctx["Live updates<br/>[SocketContext.jsx]"]
  node_authguard["Role guard<br/>[RequireAuth.jsx]"]
  node_home["Featured auctions<br/>[Home.jsx]"]
  node_auctionpages["Auction screens"]
  node_createauction["Create auction<br/>[CreateAuction.jsx]"]
  node_bidpage["Bid screen<br/>[BidPage.jsx]"]
  node_bidviews["Bid tracking<br/>[MyBids.jsx]"]
  node_cart["Cart and checkout<br/>[Cart.jsx]"]
  node_notificationsui["Notifications screen<br/>[Notifications.jsx]"]
end

subgraph group_api["API and identity"]
  node_server["Express and sockets<br/>[server.js]"]
  node_authroutes["Auth API<br/>[auth.js]"]
  node_useroutes["User API<br/>[users.js]"]
  node_usermodel[("User records<br/>[User.js]")]
end

subgraph group_auction["Auction lifecycle"]
  node_auctionroutes["Auction API<br/>[auctions.js]"]
  node_bidroutes["Bid API<br/>[bids.js]"]
  node_auctionmodel[("Auction records<br/>[Auction.js]")]
  node_bidmodel[("Bid records<br/>[Bid.js]")]
end

subgraph group_account["Buyer services"]
  node_cartapi["Cart API<br/>[cart.js]"]
  node_cartmodel[("Cart records<br/>[Cart.js]")]
  node_notificationapi["Notification API<br/>[notifications.js]"]
  node_notificationmodel[("Notification records<br/>[Notification.js]")]
  node_ordermodel[("Order records<br/>[Order.js]")]
end

node_buyer(("Buyer or seller"))
node_database[("MongoDB")]

node_buyer -->|"uses"| node_app
node_app -->|"provides auth"| node_authctx
node_app -->|"provides realtime"| node_socketctx
node_app -->|"guards routes"| node_authguard
node_app -->|"routes to"| node_home
node_app -->|"routes to"| node_auctionpages
node_app -->|"routes to"| node_createauction
node_app -->|"routes to"| node_bidpage
node_app -->|"routes to"| node_bidviews
node_app -->|"routes to"| node_cart
node_app -->|"routes to"| node_notificationsui
node_home -->|"fetches listings"| node_auctionroutes
node_authctx -->|"auth requests"| node_authroutes
node_authctx -->|"wallet request"| node_useroutes
node_socketctx -->|"opens socket"| node_server
node_server -->|"mounts API"| node_authroutes
node_server -->|"mounts API"| node_useroutes
node_server -->|"mounts API"| node_auctionroutes
node_server -->|"mounts API"| node_bidroutes
node_server -->|"mounts API"| node_cartapi
node_server -->|"mounts API"| node_notificationapi
node_server -->|"finds expired"| node_auctionmodel
node_server -->|"saves winner notice"| node_notificationmodel
node_server -->|"connects"| node_database
node_server -->|"emits auction events"| node_socketctx

click node_app "https://github.com/mohithbanka/online-auction-platform/blob/main/client/src/App.jsx"
click node_authctx "https://github.com/mohithbanka/online-auction-platform/blob/main/client/src/context/AuthContext.jsx"
click node_socketctx "https://github.com/mohithbanka/online-auction-platform/blob/main/client/src/context/SocketContext.jsx"
click node_authguard "https://github.com/mohithbanka/online-auction-platform/blob/main/client/src/components/RequireAuth.jsx"
click node_home "https://github.com/mohithbanka/online-auction-platform/blob/main/client/src/pages/Home.jsx"
click node_auctionpages "https://github.com/mohithbanka/online-auction-platform/tree/main/client/src/pages"
click node_createauction "https://github.com/mohithbanka/online-auction-platform/blob/main/client/src/pages/CreateAuction.jsx"
click node_bidpage "https://github.com/mohithbanka/online-auction-platform/blob/main/client/src/pages/BidPage.jsx"
click node_bidviews "https://github.com/mohithbanka/online-auction-platform/blob/main/client/src/pages/MyBids.jsx"
click node_cart "https://github.com/mohithbanka/online-auction-platform/blob/main/client/src/pages/Cart.jsx"
click node_notificationsui "https://github.com/mohithbanka/online-auction-platform/blob/main/client/src/pages/Notifications.jsx"
click node_server "https://github.com/mohithbanka/online-auction-platform/blob/main/server/server.js"
click node_authroutes "https://github.com/mohithbanka/online-auction-platform/blob/main/server/routes/auth.js"
click node_useroutes "https://github.com/mohithbanka/online-auction-platform/blob/main/server/routes/users.js"
click node_auctionroutes "https://github.com/mohithbanka/online-auction-platform/blob/main/server/routes/auctions.js"
click node_bidroutes "https://github.com/mohithbanka/online-auction-platform/blob/main/server/routes/bids.js"
click node_auctionmodel "https://github.com/mohithbanka/online-auction-platform/blob/main/server/models/Auction.js"
click node_bidmodel "https://github.com/mohithbanka/online-auction-platform/blob/main/server/models/Bid.js"
click node_cartapi "https://github.com/mohithbanka/online-auction-platform/blob/main/server/routes/cart.js"
click node_cartmodel "https://github.com/mohithbanka/online-auction-platform/blob/main/server/models/Cart.js"
click node_notificationapi "https://github.com/mohithbanka/online-auction-platform/blob/main/server/routes/notifications.js"
click node_notificationmodel "https://github.com/mohithbanka/online-auction-platform/blob/main/server/models/Notification.js"
click node_ordermodel "https://github.com/mohithbanka/online-auction-platform/blob/main/server/models/Order.js"
click node_usermodel "https://github.com/mohithbanka/online-auction-platform/blob/main/server/models/User.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_authctx,node_socketctx,node_authguard,node_home,node_auctionpages,node_createauction,node_bidpage,node_bidviews,node_cart,node_notificationsui toneBlue
class node_server,node_authroutes,node_useroutes,node_usermodel,node_database toneAmber
class node_auctionroutes,node_bidroutes,node_auctionmodel,node_bidmodel toneMint
class node_cartapi,node_cartmodel,node_notificationapi,node_notificationmodel,node_ordermodel toneRose
class node_buyer toneIndigo
```

## Components

### Web application

- [React app](https://github.com/mohithbanka/online-auction-platform/blob/main/client/src/App.jsx): `client/src/App.jsx`
- [Auth context](https://github.com/mohithbanka/online-auction-platform/blob/main/client/src/context/AuthContext.jsx): `client/src/context/AuthContext.jsx`
- [Live updates](https://github.com/mohithbanka/online-auction-platform/blob/main/client/src/context/SocketContext.jsx): `client/src/context/SocketContext.jsx`
- [Role guard](https://github.com/mohithbanka/online-auction-platform/blob/main/client/src/components/RequireAuth.jsx): `client/src/components/RequireAuth.jsx`
- [Featured auctions](https://github.com/mohithbanka/online-auction-platform/blob/main/client/src/pages/Home.jsx): `client/src/pages/Home.jsx`
- [Auction screens](https://github.com/mohithbanka/online-auction-platform/tree/main/client/src/pages): `client/src/pages`
- [Create auction](https://github.com/mohithbanka/online-auction-platform/blob/main/client/src/pages/CreateAuction.jsx): `client/src/pages/CreateAuction.jsx`
- [Bid screen](https://github.com/mohithbanka/online-auction-platform/blob/main/client/src/pages/BidPage.jsx): `client/src/pages/BidPage.jsx`
- [Bid tracking](https://github.com/mohithbanka/online-auction-platform/blob/main/client/src/pages/MyBids.jsx): `client/src/pages/MyBids.jsx`
- [Cart and checkout](https://github.com/mohithbanka/online-auction-platform/blob/main/client/src/pages/Cart.jsx): `client/src/pages/Cart.jsx`
- [Notifications screen](https://github.com/mohithbanka/online-auction-platform/blob/main/client/src/pages/Notifications.jsx): `client/src/pages/Notifications.jsx`

### API and identity

- [Express and sockets](https://github.com/mohithbanka/online-auction-platform/blob/main/server/server.js): `server/server.js`
- [Auth API](https://github.com/mohithbanka/online-auction-platform/blob/main/server/routes/auth.js): `server/routes/auth.js`
- [User API](https://github.com/mohithbanka/online-auction-platform/blob/main/server/routes/users.js): `server/routes/users.js`
- [User records](https://github.com/mohithbanka/online-auction-platform/blob/main/server/models/User.js): `server/models/User.js`

### Auction lifecycle

- [Auction API](https://github.com/mohithbanka/online-auction-platform/blob/main/server/routes/auctions.js): `server/routes/auctions.js`
- [Bid API](https://github.com/mohithbanka/online-auction-platform/blob/main/server/routes/bids.js): `server/routes/bids.js`
- [Auction records](https://github.com/mohithbanka/online-auction-platform/blob/main/server/models/Auction.js): `server/models/Auction.js`
- [Bid records](https://github.com/mohithbanka/online-auction-platform/blob/main/server/models/Bid.js): `server/models/Bid.js`

### Buyer services

- [Cart API](https://github.com/mohithbanka/online-auction-platform/blob/main/server/routes/cart.js): `server/routes/cart.js`
- [Cart records](https://github.com/mohithbanka/online-auction-platform/blob/main/server/models/Cart.js): `server/models/Cart.js`
- [Notification API](https://github.com/mohithbanka/online-auction-platform/blob/main/server/routes/notifications.js): `server/routes/notifications.js`
- [Notification records](https://github.com/mohithbanka/online-auction-platform/blob/main/server/models/Notification.js): `server/models/Notification.js`
- [Order records](https://github.com/mohithbanka/online-auction-platform/blob/main/server/models/Order.js): `server/models/Order.js`

### Other components

- **Buyer or seller**
- **MongoDB**

## Connections

- Buyer or seller → React app: uses
- React app → Auth context: provides auth
- React app → Live updates: provides realtime
- React app → Role guard: guards routes
- React app → Featured auctions: routes to
- React app → Auction screens: routes to
- React app → Create auction: routes to
- React app → Bid screen: routes to
- React app → Bid tracking: routes to
- React app → Cart and checkout: routes to
- React app → Notifications screen: routes to
- Featured auctions → Auction API: fetches listings
- Auth context → Auth API: auth requests
- Auth context → User API: wallet request
- Live updates → Express and sockets: opens socket
- Express and sockets → Auth API: mounts API
- Express and sockets → User API: mounts API
- Express and sockets → Auction API: mounts API
- Express and sockets → Bid API: mounts API
- Express and sockets → Cart API: mounts API
- Express and sockets → Notification API: mounts API
- Express and sockets → Auction records: finds expired
- Express and sockets → Notification records: saves winner notice
- Express and sockets → MongoDB: connects
- Express and sockets → Live updates: emits auction events