This is a quickstart for Vercel Serverless Functions. For Vercel Edge Functions, check this article.

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Database Setup

Create a Redis database using Upstash Console or Upstash CLI. Select the same region with your Vercel Serverless Function 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 create a Next.js application and deploy to Vercel. 
npx create-next-app@latest
cd my-app
Install @upstash/redis: 
npm install @upstash/redis

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The Code

Update app/api/hello.js with the template below to test the Redis client:
app/api/hello.js
import { Redis } from "@upstash/redis";
import type { NextApiRequest, NextApiResponse } from "next";

const redis = Redis.fromEnv();

export default async function handler(
  req: NextApiRequest,
  res: NextApiResponse
): Promise<void> {
  const count = await redis.incr("counter");
  res.status(200).json({ count });
}

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Configure the Credentials

We’ll place the credentials in the .env file as below:
.env
UPSTASH_REDIS_REST_URL=<YOUR_URL>
UPSTASH_REDIS_REST_TOKEN=<YOUR_TOKEN>

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Run & Deploy

You can run the app locally: npm run dev and check http://localhost:3000/api/hello Deploy your app with vercel deploy
You can also integrate your Vercel projects with Upstash using Vercel Integration module. Check this article.