server.js

const express = require('express');
const app = express();
app.use(express.json());

app.post('/shipping-rates', (req, res) => {
    // Compute the weight of all items
    console.log(req.body);
    const weight = req.body.rate.items.reduce((acc, item) => acc + item.grams, 0);
    res.json({ "rates": [ {
        "service_name": "Transporteur privée",
        "service_code": "CA",
        "total_price": "1295",
        "description": "",
        "currency": "EUR"
    },
    ]});
});

app.listen(3000, () => console.log('Shipping API running on port 3000'));