Solving Problems Through Thoughtful Design and Code

import express, { Request, Response } from 'express';

const app = express();
const PORT = 3000;

// In-memory storage for demonstration purposes
const dataStore: Record<number, string> = {};

app.use(express.json());

app.get('/', (req: Request, res: Response) => {
    res.json({ message: "Welcome to the ExpressJS Server!" });
});

app.get('/items', (req: Request, res: Response) => {
    res.json({ items: dataStore });
});

app.post('/items', (req: Request, res: Response) => {
    const { id, name } = req.body;
    if (!id || !name) {
        return res.status(400).json({ error: "Invalid data" });
    }
    dataStore[id] = name;
    res.json({ success: true, added: { id, name } });
});

app.get('/items/:id', (req: Request, res: Response) => {
    const id = parseInt(req.params.id);
    if (!(id in dataStore)) {
        return res.status(404).json({ error: "Item not found" });
    }
    res.json({ id, name: dataStore[id] });
});

app.delete('/items/:id', (req: Request, res: Response) => {
    const id = parseInt(req.params.id);
    if (id in dataStore) {
        const deletedItem = dataStore[id];
        delete dataStore[id];
        return res.json({ success: true, deleted: { id, name: deletedItem } });
    }
    res.status(404).json({ error: "Item not found" });
});

app.listen(PORT, () => {
    console.log(`Server is running on http://localhost:${PORT}`);
});