Code-MCP

import express, { Express, Request, Response, NextFunction } from "express"; import cors from "cors"; // ============================================ // Types // ============================================ interface User { id: number; email: string; name: string; createdAt: Date; } interface CreateUserDTO { email: string; name: string; password: string; } interface ApiResponse<T> { success: boolean; data?: T; error?: string; } // ============================================ // Middleware // ============================================ const errorHandler = ( err: Error, req: Request, res: Response, next: NextFunction, ) => { console.error(`[ERROR] ${err.message}`, err.stack); res.status(500).json({ success: false, error: process.env.NODE_ENV === "production" ? "Internal server error" : err.message, }); }; const requestLogger = (req: Request, res: Response, next: NextFunction) => { const start = Date.now(); res.on("finish", () => { const duration = Date.now() - start; console.log( `[${req.method}] ${req.path} - ${res.statusCode} (${duration}ms)`, ); }); next(); }; const validateBody = <T>(schema: (body: unknown) => T) => { return (req: Request, res: Response, next: NextFunction) => { try { req.body = schema(req.body); next(); } catch (error) { res.status(400).json({ success: false, error: (error as Error).message }); } }; }; // ============================================ // Simple In-Memory Database // ============================================ class Database { private users: Map<number, User> = new Map(); private nextId = 1; createUser(data: CreateUserDTO): User { const user: User = { id: this.nextId++, email: data.email, name: data.name, createdAt: new Date(), }; this.users.set(user.id, user); return user; } getUser(id: number): User | undefined { return this.users.get(id); } getAllUsers(): User[] { return Array.from(this.users.values()); } updateUser(id: number, data: Partial<User>): User | undefined { const user = this.users.get(id); if (!user) return undefined; const updated = { ...user, ...data }; this.users.set(id, updated); return updated; } deleteUser(id: number): boolean { return this.users.delete(id); } } // ============================================ // Controllers // ============================================ const db = new Database(); const userController = { getAll: async (req: Request, res: Response) => { const users = db.getAllUsers(); res.json({ success: true, data: users }); }, getById: async (req: Request, res: Response) => { const id = parseInt(req.params.id); const user = db.getUser(id); if (!user) { return res.status(404).json({ success: false, error: "User not found" }); } res.json({ success: true, data: user }); }, create: async (req: Request, res: Response) => { const user = db.createUser(req.body); res.status(201).json({ success: true, data: user }); }, update: async (req: Request, res: Response) => { const id = parseInt(req.params.id); const user = db.updateUser(id, req.body); if (!user) { return res.status(404).json({ success: false, error: "User not found" }); } res.json({ success: true, data: user }); }, delete: async (req: Request, res: Response) => { const id = parseInt(req.params.id); const deleted = db.deleteUser(id); if (!deleted) { return res.status(404).json({ success: false, error: "User not found" }); } res.status(204).send(); }, }; // ============================================ // Router // ============================================ const userRouter = express.Router(); userRouter.get("/", userController.getAll); userRouter.get("/:id", userController.getById); userRouter.post("/", userController.create); userRouter.put("/:id", userController.update); userRouter.delete("/:id", userController.delete); // ============================================ // App Setup // ============================================ const app: Express = express(); // Middleware app.use(cors()); app.use(express.json()); app.use(requestLogger); // Health check app.get("/health", (req, res) => { res.json({ status: "healthy", timestamp: new Date().toISOString() }); }); // Routes app.use("/api/users", userRouter); // Error handler (must be last) app.use(errorHandler); // Start server const PORT = process.env.PORT || 3000; if (require.main === module) { app.listen(PORT, () => { console.log(`Server running on http://localhost:${PORT}`); }); } export { app, db };