server.ts

/**
 * Runnable example: a small Hono app that uses both the @unirate/hono
 * middleware and the ready-made router.
 *
 * Run with the Node adapter (any Hono runtime works):
 *
 *   UNIRATE_API_KEY=your-key npx tsx examples/server.ts
 *
 * Then try:
 *   curl "http://localhost:3000/eur"
 *   curl "http://localhost:3000/api/unirate/rate?from=USD&to=GBP"
 *   curl "http://localhost:3000/api/unirate/convert?from=USD&to=EUR&amount=100"
 *   curl "http://localhost:3000/api/unirate/currencies"
 *   curl "http://localhost:3000/api/unirate/vat?country=DE"
 */
import { Hono } from "hono";
import { serve } from "@hono/node-server";
import { unirate, unirateRouter } from "@unirate/hono";

const apiKey = process.env.UNIRATE_API_KEY;
if (!apiKey) {
  console.error("Set UNIRATE_API_KEY (get a free key at https://unirateapi.com)");
  process.exit(1);
}

const app = new Hono();

// 1. Middleware — a typed client is attached to c.var.unirate.
app.use(unirate({ apiKey }));

app.get("/eur", async (c) => {
  const rate = await c.var.unirate.getRate("USD", "EUR");
  return c.json({ pair: "USD/EUR", rate });
});

app.get("/summary", async (c) => {
  const client = c.var.unirate;
  const [rate, converted, currencies] = await Promise.all([
    client.getRate("USD", "GBP"),
    client.convert("EUR", 100, "USD"),
    client.getSupportedCurrencies(),
  ]);
  return c.json({
    usdGbp: rate,
    hundredUsdInEur: converted,
    supportedCount: currencies.length,
  });
});

// 2. Router — mount the ready-made JSON endpoints under /api/unirate.
app.route("/api/unirate", unirateRouter({ apiKey }));

const port = Number(process.env.PORT ?? 3000);
serve({ fetch: app.fetch, port });
console.log(`Listening on http://localhost:${port}`);