Deploying a Node.js Application on AWS Lambda Using Serverless Framework

In this tutorial, we will guide you through the process of deploying a Node.js application on Amazon Web Services (AWS) Lambda using the Serverless framework. AWS Lambda is a serverless computing service that allows you to run code without provisioning or managing servers. The Serverless framework is a popular open-source tool that makes it easy to deploy serverless applications on AWS Lambda.

Before we get started, make sure you have the following prerequisites:

1. An AWS account
2. Node.js installed on your local machine
3. AWS CLI installed on your local machine

Step 1: Setup AWS CLI
If you haven’t already installed the AWS CLI, you can download and install it from the AWS website. Once you have installed the CLI, you will need to configure it with your AWS credentials. You can do this by running the following command in your terminal:

aws configure

You will be prompted to enter your Access Key ID, Secret Access Key, default region, and output format. You can find your Access Key ID and Secret Access Key in the AWS Management Console under IAM (Identity and Access Management).

Step 2: Install Serverless Framework
Next, you will need to install the Serverless framework globally on your machine by running the following command in your terminal:

npm install -g serverless

Step 3: Create a new Node.js project
Create a new directory for your Node.js project and navigate into it in your terminal. Then, initialize a new Node.js project by running the following command:

npm init -y

This will create a new package.json file in your project directory. Next, install the serverless-http package, which will allow you to run your Node.js application on AWS Lambda, by running the following command:

npm install serverless-http

Step 4: Create a Lambda handler
Create a new JavaScript file in your project directory and name it index.js. This file will contain the handler function for your Lambda function. Here is an example of a simple Node.js application that responds with "Hello, World!" when it receives a request:

const serverless = require('serverless-http');
const express = require('express');

const app = express();

app.get('/', (req, res) => {
  res.send('Hello, World!');
});

module.exports.handler = serverless(app);

Step 5: Create a Serverless configuration file
Create a new file in your project directory and name it serverless.yml. This file will contain the configuration for your serverless project. Here is an example of a serverless.yml file for deploying a Node.js application on AWS Lambda:

service: my-nodejs-app

provider:
  name: aws
  runtime: nodejs12.x
  stage: dev
  region: us-east-1

functions:
  app:
    handler: index.handler
    events:
      - http: ANY /

Step 6: Deploy your Node.js application to AWS Lambda
Now that you have created your Node.js application and set up your Serverless configuration file, you can deploy your application to AWS Lambda by running the following command in your terminal:

serverless deploy

This command will package your Node.js application and upload it to AWS Lambda. Once the deployment is successful, you will see a URL where you can access your application.

Congratulations! You have successfully deployed a Node.js application on AWS Lambda using the Serverless framework. You can now access your application by visiting the URL provided in the deployment output. If you want to make changes to your application, simply update your code and redeploy using the serverless deploy command.