Deploying Node.js functions to AWS Lambda | Serverless

Deploying Node.js functions to AWS Lambda | Serverless

Piyush Garg
·May 21, 2022·

4 min read

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Table of contents

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 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/.

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
curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip"
unzip awscliv2.zip
sudo ./aws/install
MAC OS
curl "https://awscli.amazonaws.com/AWSCLIV2.pkg" -o "AWSCLIV2.pkg"
sudo installer -pkg AWSCLIV2.pkg -target /
Windows
msiexec.exe /i https://awscli.amazonaws.com/AWSCLIV2.msi

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

3. Serverless CLI

npm install -g serverless

Serverless Installation Instructions: 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

  • Click the "Security credentials" option.

Screenshot 2022-05-21 at 2.50.03 PM.png

  • Expand the "Access Keys" Tab.

Screenshot 2022-05-21 at 2.51.24 PM.png

  • Click the "Create Access Key" button.

Screenshot 2022-05-21 at 2.52.18 PM.png

  • Copy Your Access ID and Secret.

Screenshot 2022-05-21 at 2.52.57 PM.png

Now, open your terminal and run the following command

aws configure

Paste your Access ID and Secret here and complete the setup

Piyush Macbook Terminal

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:

serverless create --template aws-nodejs

The above command would generate some boiler plate code.

Screenshot 2022-05-21 at 2.35.21 PM.png

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.

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.

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.

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

Here I can see that my function is successfully deployed Screenshot 2022-05-21 at 2.54.42 PM.png

This is the code that we wrote locally and deployed using serverless Screenshot 2022-05-21 at 3.02.05 PM.png

Click on the API Gateway icon Screenshot 2022-05-21 at 2.56.25 PM.png

Here is the public endpoint URL to invoke our lambda function Screenshot 2022-05-21 at 2.56.41 PM.png

Screenshot 2022-05-21 at 3.01.24 PM.png

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