Using Serverless Framework

This tutorial implements a serverless application and deploys it to AWS Lambda using Serverless Framework

Prerequisites

1. Install the Serverless Framework with npm i serverless -g

Project Setup

Create a Serverless Framework application with the following options:

➜  tutorials > ✗ serverlessServerless ϟ FrameworkWelcome to Serverless Framework V.4Create a new project by selecting a Template to generate scaffolding for a specific use-case.✔ Select A Template: · AWS / Node.js / HTTP API✔ Name Your Project: · counter-serverless✔ Template Downloaded✔ Create Or Select An Existing App: · Create A New App✔ Name Your New App: · counter-serverlessYour new Service "counter-serverless" is ready. Here are next steps:• Open Service Directory: cd counter-serverless• Install Dependencies: npm install (or use another package manager)• Deploy Your Service: serverless deploy

cd counter-serverless

Create package.json with @upstash/redis as a dependency:

{    "dependencies": {      "@upstash/redis": "latest"    }  }

Install the dependencies:

npm install

Database Setup

Create a Redis database using Upstash Console or Upstash CLI and copy the UPSTASH_REDIS_REST_URL and UPSTASH_REDIS_REST_TOKEN into your .env file.

UPSTASH_REDIS_REST_URL=<YOUR_URL>UPSTASH_REDIS_REST_TOKEN=<YOUR_TOKEN>

Counter Function Setup

Update handler.js:

const { Redis } = require('@upstash/redis');const redis = Redis.fromEnv();exports.counter = async (event) => {    const count = await redis.incr("counter");    return {        statusCode: 200,        body: JSON.stringify('Counter: ' + count),    };};

Update serverless.yml to pass the environment variables:

service: counter-serverlessprovider:  name: aws  runtime: nodejs20.x  environment:    UPSTASH_REDIS_REST_URL: ${env:UPSTASH_REDIS_REST_URL}    UPSTASH_REDIS_REST_TOKEN: ${env:UPSTASH_REDIS_REST_TOKEN}functions:  counter:    handler: handler.counter    events:      - httpApi:          path: /          method: get

Developing

Run the following command to start your dev session.

serverless dev

Deployment

Run the following command to deploy your service.

serverless deploy

Visit the output url.