# Deploying Node.js functions to AWS Lambda | Serverless

Hi everyone, In this blog, we will learn how we can create node.js functions locally and deploy them to AWS Lambda using serverless.

So, let's get started.

## Step 1. Create an AWS Account ☁️
In order to deploy functions to AWS Lambda, you should have an active AWS account. Creating an AWS account is really easy and straightforward. Head over to [Signup AWS](https://portal.aws.amazon.com/billing/signup?refid=em_127222&redirect_url=https%3A%2F%2Faws.amazon.com%2Fregistration-confirmation#/start/email) and create your free account.

Now, Once you have set up your AWS account, let's head over to the next step.

## Step 2. Installations and Setup 🚀
#### 1. Node.js
You must have Node.js installed on your machine. If you don't have node.js installed you can do so simply by visiting [https://nodejs.org/en/](https://nodejs.org/en/).

#### 2. AWS CLI Tools
Once you have installed node.js, you now need to install AWS CLI tools on your machine.
Installing AWS CLI is really easy. Below are the steps to install the same.

Simply copy-paste the following command on your terminal.

##### **Linux**
```bash
curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip"
```
```bash
unzip awscliv2.zip
```
```bash
sudo ./aws/install
```

##### **MAC OS**

```bash
curl "https://awscli.amazonaws.com/AWSCLIV2.pkg" -o "AWSCLIV2.pkg"
```
```bash
sudo installer -pkg AWSCLIV2.pkg -target /
```

##### **Windows**
```bash
msiexec.exe /i https://awscli.amazonaws.com/AWSCLIV2.msi
```

Instructions Link: [https://docs.aws.amazon.com/cli/latest/userguide/getting-started-install.html](https://docs.aws.amazon.com/cli/latest/userguide/getting-started-install.html)

#### 3. Serverless CLI

```bash
npm install -g serverless
```
Serverless Installation Instructions: [https://www.serverless.com/framework/docs/getting-started](https://www.serverless.com/framework/docs/getting-started)

Great, now that you have everything set up, Let's configure AWS credentials on our local machine.

## Step 3: Setting up AWS Credentials
In this step, we are going to set up AWS credentials with our AWS CLI so that our AWS CLI can communicate to our AWS account.

To set up AWS Account credentials, sign in to your  AWS Console and follow along with me.

- Click on your account name in the top right corner.

![Screenshot 2022-05-21 at 2.48.24 PM.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1653124738703/zsLhvIvJ1.png align="left")


- Click the "Security credentials" option.

![Screenshot 2022-05-21 at 2.50.03 PM.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1653124848462/Nq5IN1lnC.png align="left")

- Expand the "Access Keys" Tab.

![Screenshot 2022-05-21 at 2.51.24 PM.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1653124905134/E95xOi9Am.png align="left")

- Click the "Create Access Key" button.

![Screenshot 2022-05-21 at 2.52.18 PM.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1653124968861/cnocBWicN.png align="left")

- Copy Your Access ID and Secret.

![Screenshot 2022-05-21 at 2.52.57 PM.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1653125003203/QaNMaA_6j.png align="left")

Now, open your terminal and run the following command
```bash
aws configure
```
Paste your Access ID and Secret here and complete the setup

![Piyush Macbook Terminal](https://cdn.hashnode.com/res/hashnode/image/upload/v1653124083126/SUpG2C8Wx.png align="left")

Great, now we are ready to code.

## Step 4: Let's Code 🧑🏻‍💻
In this step, we are going to code our function and deploy it to amazon web services. Open your favourite IDE or text editor (VS code in my case) and follow me along.

First of all, create a new folder and open this folder in your fav text editor. I am going to name my folder ```my-functions```. You can name it whatever you like.

Now open the terminal at the folder and run the following command:
```bash
serverless create --template aws-nodejs
```
The above command would generate some boiler plate code.

![Screenshot 2022-05-21 at 2.35.21 PM.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1653124145465/KbzP-xBzS.png align="left")

Open the handler.js file and this is the file where are going to write our function. Feel free to remove the existing code in this file and start with a clean file.

```js
module.exports.handlerFunction = async (event, context) => {
  console.log("I am inside aws lambda function");
  return {
    statusCode: 200,
    body: JSON.stringify({ message: "Alright, It is working!" }),
  };
};
```
Great, now open serverless.yml file and feel free to clear all the content from here as well.
Paste the following code in serverless.yml file.
```yaml
service: my-functions
frameworkVersion: "3"

provider:
  name: aws
  runtime: nodejs12.x

functions:
  myFunction:
    handler: handler.handlerFunction
    events:
      - http:
          path: /api/say-hello
          method: GET
          cors: true
```
Great, now we are ready to deploy our function to AWS console.

## Step 5. Deployment
To deploy your functions to AWS console, simply open your console and paste the following command on the console.

```bash
serverless deploy
```
This will take a while and deploy your functions using the serverless.yml file to your aws console.

## Testing our Implementation 

Navigate to your AWS console and search for AWS Lambda
![Screenshot 2022-05-21 at 2.53.57 PM.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1653125074556/5R8A72uj8.png align="left")

Here I can see that my function is successfully deployed
![Screenshot 2022-05-21 at 2.54.42 PM.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1653125099896/x3HTbdAQc.png align="left")

This is the code that we wrote locally and deployed using serverless
![Screenshot 2022-05-21 at 3.02.05 PM.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1653125537015/7mYe8jR_a.png align="left")

Click on the API Gateway icon
![Screenshot 2022-05-21 at 2.56.25 PM.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1653125253837/LHYp58CV3.png align="left")

Here is the public endpoint URL to invoke our lambda function
![Screenshot 2022-05-21 at 2.56.41 PM.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1653125278261/VGvjdpzin.png align="left")


![Screenshot 2022-05-21 at 3.01.24 PM.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1653125489885/AYkPzBCHG.png align="left")