Cloudflare Workers

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Database Setup

Create a Redis database using Upstash Console or Upstash CLI. Select the global to minimize the latency from all edge locations.

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Project Setup

We will use C3 (create-cloudflare-cli) command-line tool to create our application. You can open a new terminal window and run C3 using the prompt below.

npm create cloudflare@latest

This will install the create-cloudflare package, and lead you through setup. C3 will also install Wrangler in projects by default, which helps us testing and deploying the application.

➜  npm create cloudflare@latest
Need to install the following packages:
  create-cloudflare@2.1.0
Ok to proceed? (y) y

using create-cloudflare version 2.1.0

╭ Create an application with Cloudflare Step 1 of 3
│
├ In which directory do you want to create your application?
│ dir ./cloudflare_starter
│
├ What type of application do you want to create?
│ type "Hello World" Worker
│
├ Do you want to use TypeScript?
│ yes typescript
│
├ Copying files from "hello-world" template
│
├ Do you want to use TypeScript?
│ yes typescript
│
├ Retrieving current workerd compatibility date
│ compatibility date 2023-08-07
│
├ Do you want to use git for version control?
│ yes git
│
╰ Application created

We will also install the Upstash Redis SDK to connect to Redis.

npm install @upstash/redis

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The Code

Here is a Worker template to configure and test Upstash Redis connection.

import { Redis } from "@upstash/redis/cloudflare";

export interface Env {
  UPSTASH_REDIS_REST_URL: string;
  UPSTASH_REDIS_REST_TOKEN: string;
}

export default {
  async fetch(
    request: Request,
    env: Env,
    ctx: ExecutionContext
  ): Promise<Response> {
    const redis = Redis.fromEnv(env);
    const count = await redis.incr("counter");
    return new Response(JSON.stringify({ count }));
  },
};

​

Configure Credentials

There are two methods for setting up the credentials for Upstash Redis client. The recommended way is to use Cloudflare Upstash Integration. Alternatively, you can add the credentials manually.

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Using the Cloudflare Integration

Access to the Cloudflare Dashboard and login with the same account that you’ve used while setting up the Worker application. Then, navigate to Workers & Pages > Overview section on the sidebar. Here, you’ll find your application listed.

Clicking on the application will direct you to the application details page, where you can perform the integration process. Switch to the Settings tab in the application details, and proceed to Integrations section. You will see various Worker integrations listed. To proceed, click the Add Integration button associated with the Upstash Redis.

On the Integration page, connect to your Upstash account. Then, select the related database from the dropdown menu. Finalize the process by pressing Save button.

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Setting up Manually

Navigate to Upstash Console and copy/paste your UPSTASH_REDIS_REST_URL and UPSTASH_REDIS_REST_TOKEN to your wrangler.toml as below.

[vars]
UPSTASH_REDIS_REST_URL="REPLACE_HERE"
UPSTASH_REDIS_REST_TOKEN="REPLACE_HERE"

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Test and Deploy

You can test the function locally with npx wrangler dev

Deploy your function to Cloudflare with npx wrangler deploy

The endpoint of the function will be provided to you, once the deployment is done.

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Repo

Javascript: https://github.com/upstash/upstash-redis/tree/main/examples/cloudflare-workers

Typescript: https://github.com/upstash/upstash-redis/tree/main/examples/cloudflare-workers-with-typescript

Wrangler 1: https://github.com/upstash/upstash-redis/tree/main/examples/cloudflare-workers-with-wrangler-1