AWS Lambda Introduction & Create A Serverless Function

What is Lambda

AWS Lambda is an event-driven, serverless computing platform provided by Amazon as a part of Amazon Web Services. It is a computing service that runs code in response to events and automatically manages the computing resources required by that code.

How it works

AWS Lambda is a serverless, event-driven compute service that lets you run code for virtually any type of application or backend service without provisioning or managing servers. You can trigger Lambda from over 200 AWS services and software as a service (SaaS) applications, and only pay for what you use.

I share those infromation from AWS Lambd 😁

Create a Lambda Function

Here i use Serverless for Lambda function. By using Serverless make easier to create and deploy a serverless function.

Install a serverless package.

npm install -g serverless

After installing the serverless. Run serverless from terminal

serverless

output

Now select a project type. Here i select AWS — Node.js — HTTP API . Here i project name aws-node-http-api-project .

Here i don’t need to serverless dashboard because we not need the serverless dashboard so we set to No. And we not need to deploy it also selected No.

Now open the project code at Visual Studio Code

The file list

At serverless.yaml there region is not given. Better you have to define the region. If you not give any region then it default region us-east-1 will be deployed.

service: aws-node-http-api-project
frameworkVersion: '3'
provider:
  name: aws
  runtime: nodejs18.x
  region: ap-southeast-1 # Region is Singapore
functions:
  api:
    handler: index.handler
    events:
      - httpApi:
          path: /
          method: get

The Index.js is like a hello World 😁

module.exports.handler = async (event) => {
  return {
    statusCode: 200,
    body: JSON.stringify(
      {
        message: "Go Serverless v3.0! Your function executed successfully!",
        input: event,
      },
      null,
      2
    ),
  };
};

So now deploy the serverless.

serverless deploy

Here had a profile so use my profile for deploy.

serverless deploy --aws-profile arn

So visit the site using the link [https://n7bu0mlvah.execute-api.ap-southeast-1.amazonaws.com](https://n7bu0mlvah.execute-api.ap-southeast-1.amazonaws.com/)