Hassle-free microservices with cote.js — conversion-service.js step 2

conversion-service.js

const rates = { usd_eur: 0.91, eur_usd: 1.10 };

responder.on('convert', (req, cb) => { // ideally, you would sanitize your input here.
    cb(req.amount * rates[`${req.from}_${req.to}`]);
});