2.2.3 Project Structure

A typical Node.js/Express backend might follow this structure:

// Some codebackend/
 ┣━ src/
 ┃  ┣━ config/
 ┃  ┣━ controllers/
 ┃  ┣━ middleware/
 ┃  ┣━ models/
 ┃  ┣━ routes/
 ┃  ┣━ services/
 ┃  ┣━ socket/
 ┃  ┗━ index.js
 ┣━ package.json
 ┣━ .env
 ┗━ README.md

Key Folders

1. config/

• Database (Sequelize) setup, Redis connection, environment configs.

2. controllers/

• Express route handlers, orchestrating requests → services → responses.

3. middleware/

• Auth, error handling, rate limiting, input validation.

4. models/

• Sequelize model definitions (User, Post, Trade, Syndicate, etc.).

5. routes/

• Express routers grouped by domain (userRoutes, tradeRoutes, marketRoutes, etc.).

6. services/

• Core business logic (copyTradeService, chatService, walletVerification, etc.).

7. socket/

• Socket.io event definitions (chat events, trade updates).

8. index.js

• Entry point, loads environment variables, initiates database, starts HTTP + Socket.io servers.