> ## Documentation index
> Fetch the complete documentation index at: https://upstash.com/docs/llms.txt
> Ask it with GET https://upstash.com/docs/ask?q=<keywords or question>. Short keywords rank best.
> Use these to discover all available pages before exploring further.
> Feature requests: https://upstash.com/docs/common/help/feature-requests.md lists what users asked for and how to vote for a request or add one.
> Page rating: `GET https://upstash.com/docs/feedback?path=/docs/qstash/sdks/ts/examples/receiver&helpful={true|false}&comment={comment}` records whether this page helped. The `comment` (URL-encoded, at most 500 characters) says what helped, or what was missing or wrong; a `helpful=false` rating needs it. It is anonymous and needs no key. Comments hold no code, secrets or personal data.

# Receiver

When receiving a message from QStash, you should [verify the signature](/qstash/howto/signature).
The QStash Typescript SDK provides a helper function for this.

```typescript
import { Receiver } from "@upstash/qstash";

const receiver = new Receiver({
  currentSigningKey: "YOUR_CURRENT_SIGNING_KEY",
  nextSigningKey: "YOUR_NEXT_SIGNING_KEY",
});

// ... in your request handler, with a Fetch API `request`

const signature = request.headers.get("upstash-signature") ?? "";
const body = await request.text(); // the raw body, not parsed JSON

const isValid = await receiver.verify({
  body,
  signature,
  url: "YOUR-SITE-URL",
});
```