Hello & Assalam o Alaikum Everyone! 👋

Serverless computing has gained popularity among developers in recent years as it allows them to focus on the application logic without having to worry about infrastructure management. The Serverless Framework is a powerful tool that allows developers to easily build and deploy serverless applications using different cloud providers. In this post, we will provide a tutorial on how to develop a serverless application using the Serverless Framework with AWS Lambda and API Gateway.

Let's jump in 🚀

Prerequisites:

Before we start, you will need to install the following:

1. Node.js and npm - You can download Node.js and npm from the official website: Link

2. Serverless Framework - You can install the Serverless Framework by running the following command in your terminal:

    npm install -g serverless
   

3. AWS CLI - You can download the AWS CLI from the official website: Link

4. AWS Account - You will need an AWS account to use the AWS services. (How to Create an AWS account)

Step 1: Create a New Serverless Application

To create a new serverless application, you can use the Serverless Framework CLI by running the following command in your terminal:

sls create --template aws-nodejs --path my-service

This command will create a new serverless application in a folder called "my-service" with the AWS Node.js template. You can change the template to another language if needed.

Step 2: Writing a Simple Lambda Function

Now that we have created a new serverless application, let's write a simple Lambda function that will be triggered by an HTTP request. In the "my-service" folder, create a new file called "handler.js" and add the following code:

module.exports.hello = async (event) => {
  return {
    statusCode: 200,
    body: JSON.stringify({
      message: 'Hello, World!'
    })
  };
};

This code exports a Lambda function called "hello" that returns a simple JSON response with a "message" property.

Step 3: Configuring the API Gateway

To make our Lambda function accessible through an HTTP endpoint, we need to configure an API Gateway. In the "serverless.yml" file in the root of your project, add the following code:

service: my-service

provider:
  name: aws
  runtime: nodejs14.x

functions:
  hello:
    handler: handler.hello
    events:
      - http:
          path: /
          method: get

This configuration sets up the AWS provider and defines a single Lambda function called "hello" that will be triggered by an HTTP GET request to the root of our API Gateway.

Step 4: Deploying the Serverless Application

To deploy our serverless application to AWS, we can use the Serverless Framework CLI by running the following command:

sls deploy

This command will package and deploy our application to AWS Lambda and API Gateway.

Step 5: Testing the Serverless Application

Once our serverless application is deployed, we can test it by sending an HTTP request to the API Gateway endpoint. You can find the endpoint URL in the output of the "sls deploy" command. Open a web browser and navigate to the endpoint URL, and you should see the "Hello, World!" message.

Conclusion:

In this tutorial, we have learned how to develop a serverless application using the Serverless Framework with AWS Lambda and API Gateway. We covered the development process, including choosing the appropriate language and framework for your project, testing and debugging your code, and deploying it to the cloud. By using the Serverless Framework, we can focus on writing the application logic without having to worry about infrastructure management.

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