Amazon Web Services (AWS) offers powerful tools for building serverless applications, and two key components of this ecosystem are AWS Lambda and Amazon API Gateway. This guide will walk you through integrating API Gateway with AWS Lambda to create a fully functional REST API.
AWS Lambda is a Function-as-a-Service (FaaS) offering from AWS that allows developers to execute code without provisioning or managing servers. It supports multiple programming languages like Python, Java, Go, and Node.js. For this, we will use Python.
Key features:
Amazon API Gateway is a managed service that enables developers to:
API Gateway simplifies exposing backend services to the internet securely and efficiently.
Related read: Deploying Go App On AWS EC2 Server
Integrating these services allows you to:
Now, let’s dive into the implementation.
Once the function is created, write a basic Python script to handle GET and POST requests.
Example Lambda Function
import json
data = {
"Student_details": [
{"roll_no": 1, "firstname": "Sonal", "lastname": "Sharma", "address": "Mumbai"},
{"roll_no": 2, "firstname": "Sumit", "lastname": "Agarwal", "address": "Assam"},
{"roll_no": 3, "firstname": "Mohit", "lastname": "Gupta", "address": "Goa"},
{"roll_no": 4, "firstname": "Rinku", "lastname": "Das", "address": "Gorakhpur"}
]
}
def lambda_handler(event, context):
if event['httpMethod'] == "GET":
return {
'statusCode': 200,
'body': json.dumps(data)
}
elif event['httpMethod'] == "POST":
new_record = json.loads(event['body'])
data['Student_details'].append(new_record)
return {
'statusCode': 201,
'body': json.dumps('Created Successfully')
}Save and deploy the Lambda function.
Repeat steps 3–5 to create a POST method.
Lambda Proxy vs. Non-Proxy Integration
Use a tool like Postman or Curl to test your API.
GET Request
Endpoint: <Invoke URL>/demoExample Response
{
"Student_details": [
{"roll_no": 1, "firstname": "Sonal", "lastname": "Sharma", "address": "Mumbai"},
{"roll_no": 2, "firstname": "Sumit", "lastname": "Agarwal", "address": "Assam"},
{"roll_no": 3, "firstname": "Mohit", "lastname": "Gupta", "address": "Goa"},
{"roll_no": 4, "firstname": "Rinku", "lastname": "Das", "address": "Gorakhpur"}
]
}POST Request
Endpoint: <Invoke URL>/demoRequest Body
{
"roll_no": 5,
"firstname": "Sonam",
"lastname": "Devi",
"address": "Delhi"
}Response
"Created Successfully"1. Add Input Validation
2. Enable CORS
3. Secure Your API
Integrating Amazon API Gateway with AWS Lambda provides a serverless, cost-effective way to build and deploy APIs. This highly scalable and flexible integration makes it ideal for a wide range of applications, from simple backend services to complex microservice architectures. Experiment with advanced configurations to fully utilize the capabilities of both services!
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