# jineshprajapat/chat-application architecture

> Architecture diagram of the GitHub repository jineshprajapat/chat-application, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-09-27). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/jineshprajapat/chat-application
- Repository: https://github.com/jineshprajapat/chat-application

## Overview

This is a React and Express peer-to-peer messaging application. Users authenticate, discover people and conversations, then exchange messages over Socket.IO; conversation and message data are persisted in MongoDB and updates are sent to the relevant clients. The graph includes the documented history, online/unread status, editing and deletion capabilities. Some frontend and socket wiring is inferred from the README and tree rather than sampled source, so uncertain call relationships are omitted.

Main entry points: [`Server/socketHandlers`](https://github.com/jineshprajapat/chat-application/tree/main/Server/socketHandlers) (Message handlers), [`Frontend/src/Components/Chat/Chat.jsx`](https://github.com/jineshprajapat/chat-application/blob/main/Frontend/src/Components/Chat/Chat.jsx) (Chat UI), [`Server/models/Message.js`](https://github.com/jineshprajapat/chat-application/blob/main/Server/models/Message.js) (Message records), [`Frontend/src/App.js`](https://github.com/jineshprajapat/chat-application/blob/main/Frontend/src/App.js) (App flow)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_client["Web client"]
  node_app["App flow<br/>[App.js]"]
  node_auth_ui["Sign-up UI<br/>[SignUp.jsx]"]
  node_auth_state["Auth state<br/>[AuthProvider.js]"]
  node_chat_ui["Chat UI<br/>[Chat.jsx]"]
  node_conversation_ui["Conversation view<br/>[Conversation.jsx]"]
  node_chat_box["Message view<br/>[ChatBox.jsx]"]
  node_redux["Chat state<br/>[store.js]"]
end

subgraph group_identity["Identity and API"]
  node_api_client["HTTP client<br/>[api.js]"]
  node_user_routes["User routes<br/>[User.js]"]
  node_user_controller["User controller<br/>[User.js]"]
  node_server_entry["HTTP server setup<br/>[index.js]"]
end

subgraph group_realtime["Real-time messaging"]
  node_socket_client["Socket client"]
  node_socket_auth["Socket JWT auth<br/>[authSocket.js]"]
  node_socket_server["Socket server<br/>[socketServer.js]"]
  node_message_handlers["Message handlers"]
  node_conversation_handler["Conversation handler"]
  node_history_handler["History handler"]
  node_send_handler["Send handler"]
  node_status_handlers["Status handlers"]
  node_edit_handler["Edit handler"]
  node_delete_handler["Delete handler"]
end

subgraph group_data["Persistence and services"]
  node_user_model["User records<br/>[User.js]"]
  node_conversation_model["Conversation records<br/>[Conversation.js]"]
  node_message_model["Message records<br/>[Message.js]"]
  node_database["MongoDB connector<br/>[database.js]"]
end

node_user(("User"))
node_mongo[("MongoDB")]

node_user -->|"uses"| node_app
node_app -->|"checks session"| node_auth_state
node_app -->|"renders signed out"| node_auth_ui
node_app -->|"renders signed in"| node_chat_ui
node_user -->|"signs up"| node_auth_ui
node_auth_ui -->|"submits credentials"| node_api_client
node_api_client -->|"calls API"| node_user_routes
node_user_routes -->|"dispatches"| node_user_controller
node_user_controller -->|"reads and writes"| node_user_model
node_user -->|"uses chat"| node_chat_ui
node_chat_ui -->|"shows conversations"| node_conversation_ui
node_chat_ui -->|"shows messages"| node_chat_box
node_chat_ui -->|"updates state"| node_redux
node_conversation_ui -->|"requests conversations"| node_socket_client
node_chat_box -->|"sends and receives"| node_socket_client
node_socket_client -->|"exchanges events"| node_socket_server
node_socket_server -->|"verifies token"| node_socket_auth
node_socket_server -->|"dispatches events"| node_message_handlers
node_message_handlers -->|"dispatches event"| node_conversation_handler
node_message_handlers -->|"dispatches event"| node_history_handler
node_message_handlers -->|"dispatches event"| node_send_handler
node_message_handlers -->|"dispatches event"| node_status_handlers
node_message_handlers -->|"dispatches event"| node_edit_handler
node_message_handlers -->|"dispatches event"| node_delete_handler
node_send_handler -->|"finds and updates"| node_conversation_model
node_send_handler -->|"creates message"| node_message_model
node_history_handler -->|"loads history"| node_conversation_model
node_status_handlers -->|"finds conversation"| node_conversation_model
node_status_handlers -->|"marks seen"| node_message_model
node_edit_handler -->|"updates message"| node_message_model
node_delete_handler -->|"deletes messages"| node_message_model
node_delete_handler -->|"reloads history"| node_history_handler
node_conversation_model -->|"persists"| node_mongo
node_message_model -->|"persists"| node_mongo
node_user_model -->|"persists"| node_mongo
node_server_entry -->|"connects"| node_database
node_database -->|"connects"| node_mongo
node_server_entry -->|"initializes"| node_socket_server

click node_app "https://github.com/jineshprajapat/chat-application/blob/main/Frontend/src/App.js"
click node_auth_ui "https://github.com/jineshprajapat/chat-application/blob/main/Frontend/src/Components/Auth/SignUp.jsx"
click node_auth_state "https://github.com/jineshprajapat/chat-application/blob/main/Frontend/src/AuthProvider/AuthProvider.js"
click node_chat_ui "https://github.com/jineshprajapat/chat-application/blob/main/Frontend/src/Components/Chat/Chat.jsx"
click node_conversation_ui "https://github.com/jineshprajapat/chat-application/blob/main/Frontend/src/Components/Chat/Conversation/Conversation.jsx"
click node_chat_box "https://github.com/jineshprajapat/chat-application/blob/main/Frontend/src/Components/Chat/ChatBox/ChatBox.jsx"
click node_redux "https://github.com/jineshprajapat/chat-application/blob/main/Frontend/src/Redux/store.js"
click node_api_client "https://github.com/jineshprajapat/chat-application/blob/main/Frontend/src/API/api.js"
click node_user_routes "https://github.com/jineshprajapat/chat-application/blob/main/Server/routes/User.js"
click node_user_controller "https://github.com/jineshprajapat/chat-application/blob/main/Server/controllers/User.js"
click node_socket_client "https://github.com/jineshprajapat/chat-application/blob/main/Frontend/src/realTimeCommunication/socketConnection.js"
click node_socket_auth "https://github.com/jineshprajapat/chat-application/blob/main/Server/middleware/authSocket.js"
click node_socket_server "https://github.com/jineshprajapat/chat-application/blob/main/Server/socketServer.js"
click node_message_handlers "https://github.com/jineshprajapat/chat-application/tree/main/Server/socketHandlers"
click node_conversation_handler "https://github.com/jineshprajapat/chat-application/blob/main/Server/socketHandlers/conversationHandler.js"
click node_history_handler "https://github.com/jineshprajapat/chat-application/blob/main/Server/socketHandlers/directChatHistoryHandler.js"
click node_send_handler "https://github.com/jineshprajapat/chat-application/blob/main/Server/socketHandlers/directMessageHandler.js"
click node_status_handlers "https://github.com/jineshprajapat/chat-application/blob/main/Server/socketHandlers/updateSeenHandler.js"
click node_edit_handler "https://github.com/jineshprajapat/chat-application/blob/main/Server/socketHandlers/updateMessageHandler.js"
click node_delete_handler "https://github.com/jineshprajapat/chat-application/blob/main/Server/socketHandlers/deleteMessageHandler.js"
click node_user_model "https://github.com/jineshprajapat/chat-application/blob/main/Server/models/User.js"
click node_conversation_model "https://github.com/jineshprajapat/chat-application/blob/main/Server/models/Conversation.js"
click node_message_model "https://github.com/jineshprajapat/chat-application/blob/main/Server/models/Message.js"
click node_database "https://github.com/jineshprajapat/chat-application/blob/main/Server/config/database.js"
click node_server_entry "https://github.com/jineshprajapat/chat-application/blob/main/Server/index.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_auth_ui,node_auth_state,node_chat_ui,node_conversation_ui,node_chat_box,node_redux,node_user toneBlue
class node_api_client,node_user_routes,node_user_controller,node_server_entry,node_mongo toneAmber
class node_socket_client,node_socket_auth,node_socket_server,node_message_handlers,node_conversation_handler,node_history_handler,node_send_handler,node_status_handlers,node_edit_handler,node_delete_handler toneMint
class node_user_model,node_conversation_model,node_message_model,node_database toneRose
```

## Components

### Web client

- [App flow](https://github.com/jineshprajapat/chat-application/blob/main/Frontend/src/App.js): `Frontend/src/App.js`
- [Sign-up UI](https://github.com/jineshprajapat/chat-application/blob/main/Frontend/src/Components/Auth/SignUp.jsx): `Frontend/src/Components/Auth/SignUp.jsx`
- [Auth state](https://github.com/jineshprajapat/chat-application/blob/main/Frontend/src/AuthProvider/AuthProvider.js): `Frontend/src/AuthProvider/AuthProvider.js`
- [Chat UI](https://github.com/jineshprajapat/chat-application/blob/main/Frontend/src/Components/Chat/Chat.jsx): `Frontend/src/Components/Chat/Chat.jsx`
- [Conversation view](https://github.com/jineshprajapat/chat-application/blob/main/Frontend/src/Components/Chat/Conversation/Conversation.jsx): `Frontend/src/Components/Chat/Conversation/Conversation.jsx`
- [Message view](https://github.com/jineshprajapat/chat-application/blob/main/Frontend/src/Components/Chat/ChatBox/ChatBox.jsx): `Frontend/src/Components/Chat/ChatBox/ChatBox.jsx`
- [Chat state](https://github.com/jineshprajapat/chat-application/blob/main/Frontend/src/Redux/store.js): `Frontend/src/Redux/store.js`

### Identity and API

- [HTTP client](https://github.com/jineshprajapat/chat-application/blob/main/Frontend/src/API/api.js): `Frontend/src/API/api.js`
- [User routes](https://github.com/jineshprajapat/chat-application/blob/main/Server/routes/User.js): `Server/routes/User.js`
- [User controller](https://github.com/jineshprajapat/chat-application/blob/main/Server/controllers/User.js): `Server/controllers/User.js`
- [HTTP server setup](https://github.com/jineshprajapat/chat-application/blob/main/Server/index.js): `Server/index.js`

### Real-time messaging

- [Socket client](https://github.com/jineshprajapat/chat-application/blob/main/Frontend/src/realTimeCommunication/socketConnection.js): `Frontend/src/realTimeCommunication/socketConnection.js`
- [Socket JWT auth](https://github.com/jineshprajapat/chat-application/blob/main/Server/middleware/authSocket.js): `Server/middleware/authSocket.js`
- [Socket server](https://github.com/jineshprajapat/chat-application/blob/main/Server/socketServer.js): `Server/socketServer.js`
- [Message handlers](https://github.com/jineshprajapat/chat-application/tree/main/Server/socketHandlers): `Server/socketHandlers`
- [Conversation handler](https://github.com/jineshprajapat/chat-application/blob/main/Server/socketHandlers/conversationHandler.js): `Server/socketHandlers/conversationHandler.js`
- [History handler](https://github.com/jineshprajapat/chat-application/blob/main/Server/socketHandlers/directChatHistoryHandler.js): `Server/socketHandlers/directChatHistoryHandler.js`
- [Send handler](https://github.com/jineshprajapat/chat-application/blob/main/Server/socketHandlers/directMessageHandler.js): `Server/socketHandlers/directMessageHandler.js`
- [Status handlers](https://github.com/jineshprajapat/chat-application/blob/main/Server/socketHandlers/updateSeenHandler.js): `Server/socketHandlers/updateSeenHandler.js`
- [Edit handler](https://github.com/jineshprajapat/chat-application/blob/main/Server/socketHandlers/updateMessageHandler.js): `Server/socketHandlers/updateMessageHandler.js`
- [Delete handler](https://github.com/jineshprajapat/chat-application/blob/main/Server/socketHandlers/deleteMessageHandler.js): `Server/socketHandlers/deleteMessageHandler.js`

### Persistence and services

- [User records](https://github.com/jineshprajapat/chat-application/blob/main/Server/models/User.js): `Server/models/User.js`
- [Conversation records](https://github.com/jineshprajapat/chat-application/blob/main/Server/models/Conversation.js): `Server/models/Conversation.js`
- [Message records](https://github.com/jineshprajapat/chat-application/blob/main/Server/models/Message.js): `Server/models/Message.js`
- [MongoDB connector](https://github.com/jineshprajapat/chat-application/blob/main/Server/config/database.js): `Server/config/database.js`

### Other components

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

## Connections

- User → App flow: uses
- App flow → Auth state: checks session
- App flow → Sign-up UI: renders signed out
- App flow → Chat UI: renders signed in
- User → Sign-up UI: signs up
- Sign-up UI → HTTP client: submits credentials
- HTTP client → User routes: calls API
- User routes → User controller: dispatches
- User controller → User records: reads and writes
- User → Chat UI: uses chat
- Chat UI → Conversation view: shows conversations
- Chat UI → Message view: shows messages
- Chat UI → Chat state: updates state
- Conversation view → Socket client: requests conversations
- Message view → Socket client: sends and receives
- Socket client → Socket server: exchanges events
- Socket server → Socket JWT auth: verifies token
- Socket server → Message handlers: dispatches events
- Message handlers → Conversation handler: dispatches event
- Message handlers → History handler: dispatches event
- Message handlers → Send handler: dispatches event
- Message handlers → Status handlers: dispatches event
- Message handlers → Edit handler: dispatches event
- Message handlers → Delete handler: dispatches event
- Send handler → Conversation records: finds and updates
- Send handler → Message records: creates message
- History handler → Conversation records: loads history
- Status handlers → Conversation records: finds conversation
- Status handlers → Message records: marks seen
- Edit handler → Message records: updates message
- Delete handler → Message records: deletes messages
- Delete handler → History handler: reloads history
- Conversation records → MongoDB: persists
- Message records → MongoDB: persists
- User records → MongoDB: persists
- HTTP server setup → MongoDB connector: connects
- MongoDB connector → MongoDB: connects
- HTTP server setup → Socket server: initializes