This tutorial uses @upstash/redis which is designed for serverless runtimes for efficient connection handling. You can use your favorite Redis client, but you may have to deal with connection issues as described here.

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Database Setup

Create a Redis database using Upstash Console or Upstash CLI. Select the same region with your AWS Lambda to minimize the latency. Copy the UPSTASH_REDIS_REST_URL and UPSTASH_REDIS_REST_TOKEN for the next steps.

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Project Setup

We will use Serverless Framework but you can use AWS SAM or others. Run npx serverless and select the AWS - Node.js - HTTP API 
npx serverless

Creating a new serverless project

? What do you want to make? AWS - Node.js - HTTP API
? What do you want to call this project? aws-node-http-api-project

✔ Project successfully created in aws-node-http-api-project folder

? Do you want to login/register to Serverless Dashboard? No

? Do you want to deploy now? No

What next?
Run these commands in the project directory:

serverless deploy    Deploy changes
serverless info      View deployed endpoints and resources
serverless invoke    Invoke deployed functions
serverless --help    Discover more commands
Install dependencies: 
cd aws-node-http-api-project
npm init -y
npm install @upstash/redis

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The Code

Update handler.js as below and replace UPSTASH_REDIS_REST_URL and UPSTASH_REDIS_REST_TOKEN: 
const { Redis } = require("@upstash/redis/with-fetch");

module.exports.hello = async (event) => {
  const redis = new Redis({
    url: "UPSTASH_REDIS_REST_URL",
    token: "UPSTASH_REDIS_REST_TOKEN",
  });

  const data = await redis.incr("counter");
  return {
    statusCode: 200,
    body: JSON.stringify({
      view_count: data,
    }),
  };
};

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Deploy

Deploy your function with npx serverless deploy The endpoint of the AWS Lambda function will be printed.

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Repo

https://github.com/upstash/upstash-redis/tree/main/examples/aws-lambda