GitHub Repository

You can find the project source code on GitHub.

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Prerequisites

  1. Create an Azure account.
  2. Set up Azure CLI
  3. Install the Azure Functions Core Tools

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Project Setup

Initialize the project: 
func init --typescript
Install @upstash/redis 
npm install @upstash/redis

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Counter Function Setup

Create a new function from template. 
func new --name CounterFunction --template "HTTP trigger" --authlevel "anonymous"
Update /src/functions/CounterFunction.ts
/src/functions/CounterFunction.ts
import { app, HttpRequest, HttpResponseInit, InvocationContext } from "@azure/functions";
import { Redis } from "@upstash/redis";

const redis = new Redis({
    url: process.env.UPSTASH_REDIS_REST_URL,
    token: process.env.UPSTASH_REDIS_REST_TOKEN
});

export async function CounterFunction(request: HttpRequest, context: InvocationContext): Promise<HttpResponseInit> {
    const count = await redis.incr("counter");

    return { status: 200, body: `Counter: ${count}` };
};

app.http('CounterFunction', {
    methods: ['GET', 'POST'],
    authLevel: 'anonymous',
    handler: CounterFunction
});

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Create Azure Resources

You can use the command below to find the name of a region near you. 
az account list-locations
Create a resource group. 
az group create --name AzureFunctionsQuickstart-rg --location <REGION>
Create a storage account. 
az storage account create --name <STORAGE_NAME> --location <REGION> --resource-group AzureFunctionsQuickstart-rg --sku Standard_LRS --allow-blob-public-access false
Create your Function App. 
az functionapp create --resource-group AzureFunctionsQuickstart-rg --consumption-plan-location <REGION> --runtime node --runtime-version 18 --functions-version 4 --name <APP_NAME> --storage-account <STORAGE_NAME>

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Database Setup

Create a Redis database using Upstash Console or Upstash CLI and set UPSTASH_REDIS_REST_URL and UPSTASH_REDIS_REST_TOKEN in your Function App’s settings. 
az functionapp config appsettings set --name <APP_NAME> --resource-group AzureFunctionsQuickstart-rg --settings UPSTASH_REDIS_REST_URL=<YOUR_URL> UPSTASH_REDIS_REST_TOKEN=<YOUR_TOKEN>

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Deploy

Take a build of your application. 
npm run build
Publish your application. 
func azure functionapp publish <APP_NAME>
Visit the given Invoke URL.