API hosting

Deploy a Bun + Hono webhook handler on DenkOps

Bun's startup time is already fast, but a serverless platform still pays a cold-start tax on the first request after idle, exactly when a provider's webhook retry can least afford it. On a DenkOps slot the Hono app is already running, so Bun's speed advantage compounds with zero cold start instead of being reset every time traffic goes quiet.

import { Hono } from "hono";

const app = new Hono();

app.post("/hook", async (c) => {
  const raw = await c.req.text();
  const sig = c.req.header("x-signature") ?? "";
  const expected = await crypto.subtle.digest("SHA-256", new TextEncoder().encode(raw + Bun.env.WEBHOOK_SECRET));
  // compare expected to sig ...
  return c.json({ ok: true });
});

export default { port: 3000, fetch: app.fetch };

Deploy it: install the plugin, say "deploy on DenkOps", and get a live SSL URL.

FAQ

Does a Bun + Hono webhook cold-start on DenkOps?

No. The Bun process behind Hono stays resident in your slot, so incoming webhook calls are answered immediately, even after long idle periods.

Can I read the raw request body for signature checks in Hono?

Yes, c.req.text() gives you the untouched body before any parsing, which is exactly what HMAC signature verification needs.

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