# Source: https://upstash.com/docs/redis/tutorials/using_serverless_framework.md

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# Using Serverless Framework

<Card title="GitHub Repository" icon="github" href="https://github.com/upstash/redis-js/tree/main/examples/serverless-framework/counter" horizontal>
  You can find the project source code on GitHub.
</Card>

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:

```shell  theme={"system"}
➜  tutorials > ✗ serverless
Serverless ϟ Framework

Welcome to Serverless Framework V.4

Create 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-serverless

Your 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
```

```shell  theme={"system"}
cd counter-serverless
```

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

```json package.json theme={"system"}
{
    "dependencies": {
      "@upstash/redis": "latest"
    }
  }
```

Install the dependencies:

```shell  theme={"system"}
npm install
```

### Database Setup

Create a Redis database using [Upstash Console](https://console.upstash.com) or [Upstash CLI](https://github.com/upstash/cli) and copy the `UPSTASH_REDIS_REST_URL` and `UPSTASH_REDIS_REST_TOKEN` into your `.env` file.

```shell .env theme={"system"}
UPSTASH_REDIS_REST_URL=<YOUR_URL>
UPSTASH_REDIS_REST_TOKEN=<YOUR_TOKEN>
```

### Counter Function Setup

Update `handler.js`:

```js handler.js theme={"system"}
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:

```yaml serverless.yml theme={"system"}
service: counter-serverless

provider:
  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.

```shell  theme={"system"}
serverless dev
```

### Deployment

Run the following command to deploy your service.

```shell  theme={"system"}
serverless deploy
```

Visit the output url.