Source Code This is a step by step guide on how to receive webhooks from QStash in your Deno deploy project.

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1. Create a new project

Go to https://dash.deno.com/projects and create a new playground project.

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2. Edit the handler function

Then paste the following code into the browser editor: 
import { serve } from "https://deno.land/std@0.142.0/http/server.ts";
import { Receiver } from "https://deno.land/x/upstash_qstash@v0.1.4/mod.ts";

serve(async (req: Request) => {
  const r = new Receiver({
    currentSigningKey: Deno.env.get("QSTASH_CURRENT_SIGNING_KEY")!,
    nextSigningKey: Deno.env.get("QSTASH_NEXT_SIGNING_KEY")!,
  });

  const isValid = await r
    .verify({
      signature: req.headers.get("Upstash-Signature")!,
      body: await req.text(),
    })
    .catch((err: Error) => {
      console.error(err);
      return false;
    });

  if (!isValid) {
    return new Response("Invalid signature", { status: 401 });
  }

  console.log("The signature was valid");

  // do work

  return new Response("OK", { status: 200 });
});

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3. Add your signing keys

Click on the settings button at the top of the screen and then click + Add Variable Get your current and next signing key from Upstash and then set them in deno deploy.

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4. Deploy

Simply click on Save & Deploy at the top of the screen.

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5. Publish a message

Make note of the url displayed in the top right. This is the public url of your project. 
curl --request POST "https://qstash.upstash.io/v2/publish/https://early-frog-33.deno.dev" \
     -H "Authorization: Bearer <QSTASH_TOKEN>" \
     -H "Content-Type: application/json" \
     -d "{ \"hello\": \"world\"}"
In the logs you should see something like this:
start time: 2.21 ms
Listening on http://localhost:8000/
The signature was valid

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Next Steps

That’s it, you have successfully created a secure deno API, that receives and verifies incoming webhooks from qstash. Learn more about publishing a message to qstash here