Building Your First Serverless API with AWS Lambda and API Gateway
A beginner-friendly guide to creating a scalable, serverless REST API using AWS Lambda and Amazon API Gateway. Learn how to deploy your first function, configure HTTP routes, and test your endpoint without managing a single server.
Serverless architecture allows developers to build and run applications without the burden of managing infrastructure. In this guide, we will walk through the basics of creating a simple REST API using AWS Lambda and Amazon API Gateway.
Why Serverless?
- No infrastructure management: Focus entirely on your code.
- Auto-scaling: Scales automatically with demand.
- Pay for value: You only pay for the compute time you consume.
Step 1: Create a Lambda Function
AWS Lambda is the core compute service for serverless applications.
- Navigate to the Lambda console.
- Click Create function and select Author from scratch.
- Name your function
hello-world-apiand choose a runtime (e.g., Python 3.10 or Node.js 20.x). - Replace the boilerplate code with a simple JSON response and click Deploy.
Step 2: Configure API Gateway
API Gateway acts as the "front door" for your Lambda function.
- Go to the API Gateway console and create a new HTTP API.
- Add an integration and select your
hello-world-apiLambda function. - Configure your routes (e.g.,
GET /hello) and attach them to the integration. - Leave the default stage settings and click Create.
Step 3: Test Your API
Once your API is created, API Gateway will provide an invoke URL. Copy this URL, append your route (e.g.,
https://your-api-id.execute-api.region.amazonaws.com/hello), and paste it into your browser. You should see the JSON response returned by your Lambda function!Conclusion
You've just built a fully functional, highly scalable API in a matter of minutes. From here, you can start integrating DynamoDB for storage or setting up IAM policies for security. Happy building!
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