How to Integrate API Gateway and Lambda Functions in a Serverless Architecture?
What is API Gateway?
API Gateway is a fully managed service provided by AWS (Amazon Web Services) that allows you to create, deploy, and manage APIs at any scale. It acts as a front door for your applications, enabling you to define endpoints, handle requests, and control access to your APIs.
What is Lambda Function?
A Lambda function is a small piece of code that runs in the cloud without requiring you to provision or manage servers. You can write your Lambda functions in various programming languages, such as Python, Node.js, Java, etc. These functions are event-driven and can be triggered by different events, including HTTP requests.
So today we are learning How to integrate API Gateway with the lambda function ‼️
To connect API Gateway with Lambda functions, you can follow these steps:
Step 1: Create a Lambda Function
Search the lambda in the search box and search lambda, and then click on the create a function
Begin by creating a Lambda function using the AWS Management Console or AWS CLI. Write your function’s logic in the preferred programming language, considering the event and context parameters passed to the function. Ensure your function returns an appropriate response to API Gateway.
write code in the code source in my case I write code in Python because I selected Python 3.10 as a runtime to interpret the code
when you are done with your code then click on the deploy button, as you click on the deploy button the first time it asks for configure test event
in this you it asking for the event name so give the event name, and what name you want. and click the save button to save the event.
After saving the event click on the test button to test the code when you test the code it gives the output on the next tab.
Step 2: Create an API Gateway
now we want to create an API gateway, so search API gateway in the search box and open the API gateway service.
Now you landed on the API page so click the Create API button as shown in the below screenshot.
In the AWS Management Console, navigate to API Gateway and create a new REST API. by clicking on the build button as shown in the below screenshot in the section of REST API
after clicking the build button you landed on a new page, where you want to choose the protocol, here you create a new API and give the name of the API in the section of the API name and after filling in all the things click on the CREATE API button and create the API
Define the API endpoints and methods required for your application. so first we are defining the endpoint, so for this, in the Action click on the created resource for creating the endpoint.
give them the resource name and resource path and click on the Create Resource, this is the endpoint of your API /myapi
and after that, create a method for API, for that which method you want to create like GET, POST, PUT, and many more methods we have.
in my case I am using the GET method, it is the default method of the browser.
For each endpoint in your API, create the corresponding API Gateway methods and resources. Associate the integration you created in the previous step with the relevant method.
and integrate the API endpoint with the lambda function in this choose the integration type in my case I am using the lambda function and chose the region and lambda function, that function you want to integrate with your API and save the setup.
Once you have defined your API endpoints, resources, and methods, you need to deploy the API to make it accessible. API Gateway provides deployment stages to manage different versions or environments (e.g., development, production). Choose the appropriate deployment stage and publish the API.
when you click deploy API it gives the popup, and in this popup, we want to give the deployment stage and stage name and click the deploy button.
and click on the get, then the right side you got your API link.
It is the API link, if you trigger the link by the, behind it call the lambda function and the output shown on the browser.
Conclusion:
Integrating API Gateway and Lambda functions in a serverless architecture empowers you to build scalable and flexible applications with ease. By following the step-by-step guide outlined in this article, you can create a seamless connection between API Gateway and Lambda, allowing you to implement robust business logic and provide a secure and performant API to your users. Embrace the power of serverless computing and leverage these AWS services to build modern and efficient applications.
I hope this explanation helps clarify the steps involved
I hope this article will be useful for you and you learned something new.
thank you : )
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