Backend Core Skill

Instructions

1. Routing

- Create RESTful routes (GET, POST, PUT, DELETE) - Organize routes by feature/module - Use clear and meaningful endpoint names

1. Request & Response Handling

- Validate incoming request data - Handle headers, params, body, and query - Send proper HTTP status codes and JSON responses

1. Database Connection

- Connect to databases (MongoDB, PostgreSQL, MySQL) - Use ORM/ODM when needed - Handle connection errors safely

1. Business Logic

- Separate logic from routes (controllers/services) - Keep code clean and reusable - Handle async operations properly

Best Practices

• Follow MVC or service-based architecture
• Always validate and sanitize user input
• Use environment variables for secrets
• Handle errors with try/catch or middleware
• Keep APIs consistent and predictable

Example Structure

// routes/user.routes.js
import express from "express";
import { createUser, getUsers } from "../controllers/user.controller.js";

const router = express.Router();

router.post("/users", createUser);
router.get("/users", getUsers);

export default router;