This is a step-by-step guide on how to use Upstash Redis to create a view counter in your Deno deploy project.

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Create a database

Create a Redis database using Upstash Console or Upstash CLI. Select the global to minimize the latency from all edge locations. Copy the UPSTASH_REDIS_REST_URL and UPSTASH_REDIS_REST_TOKEN for the next steps.

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Create a Deno deploy 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 { Redis } from "https://deno.land/x/upstash_redis@v1.14.0/mod.ts";

serve(async (_req: Request) => {
  if (!_req.url.endsWith("favicon.ico")) {
    const redis = new Redis({
      url: "https://global-smart-lizard-32830.upstash.io",
      token: "AXV0NzFjNjQtZjg1Yy00YTgdfg765tyjhZDg3MmUyYmQ6765MDg",
    });

    const counter = await redis.incr("deno-counter");
    return new Response(JSON.stringify({ counter }), { status: 200 });
  }
});

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3. Deploy and Run

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