Getting Started with Serverless: Your First AWS Lambda Function

Hello & Assalam o Alaikum Everyone! 👋

Serverless computing has become increasingly popular in recent years, with major providers such as AWS, Azure, and Google Cloud offering powerful serverless platforms for developers. In this tutorial, we'll focus on AWS Lambda and show you how to create a simple "Hello World" application using Node.js.

Let's jump in 🚀

Prerequisites

Before getting started with AWS Lambda, you'll need to have the following prerequisites in place:

• An AWS account (How to Create an AWS account)

• AWS CLI installed on your local machine (How to install CLI)

• Node.js installed on your local machine (Install Nodejs)

Creating a Lambda Function

To create a new Lambda function in AWS, follow these steps:

1. Log in to your AWS account and navigate to the Lambda console.

2. Click on the "Create function" button to start creating a new Lambda function.

3. Choose "Author from scratch" and enter a name for your function.

4. Choose "Node.js" as the runtime and select the latest version.

5. Under "Permissions", choose "Create a new role with basic Lambda permissions".

6. Click on "Create function" to create the new Lambda function.

Writing Your First Function

Now that you have created a new Lambda function, it's time to write your first function. To create a simple "Hello World" function, follow these steps:

1. In the function editor, replace the default code with the following:

exports.handler = async (event) => {
  const response = {
      statusCode: 200,
      body: 'Hello World!'
  };
  return response;
};

1. Click on the "Deploy" button to deploy your new function.

Testing Your Function

To test your new Lambda function, follow these steps:

1. Click on the "Test" button in the top right corner of the function editor.

2. Choose "Create new test event" and enter a name for your test event.

3. Replace the default JSON code with the following:

{
  "key1": "value1",
  "key2": "value2",
  "key3": "value3"
}

1. Click on the "Create" button to create your new test event.

2. Click on the "Test" button to test your function with the new test event.

Conclusion

Congratulations! You have successfully created and tested your first AWS Lambda function using Node.js. Serverless architecture has become an important tool for modern application development, allowing developers to build highly scalable and resilient applications with minimal infrastructure management. With AWS Lambda, you can easily deploy and manage your functions, while taking advantage of the powerful features and services provided by AWS.

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