Learn Aws-lambda - 10 Code Examples & CST Typing Practice Test

AWS Lambda is a serverless compute service that lets developers run code without provisioning or managing servers, automatically scaling with incoming requests.

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Simple AWS Lambda Function (Python)AWS Lambda Function with Query Parameters AWS Lambda Function with JSON Response AWS Lambda Function Handling POST Requests AWS Lambda Function Using Environment Variables AWS Lambda Function Redirect AWS Lambda Function with Custom Headers AWS Lambda Function Fetching External API AWS Lambda Function Returning HTML AWS Lambda Function Conditional Response

Learn AWS-LAMBDA with Real Code Examples

Updated Nov 25, 2025

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Code Sample Descriptions

Simple AWS Lambda Function (Python)

# aws_lambda/demo/lambda_function.py
def lambda_handler(event, context):
    return {
        'statusCode': 200,
        'body': 'Hello, Lambda!'
    }

A simple AWS Lambda function in Python that returns 'Hello, Lambda!' when invoked.

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AWS Lambda Function with Query Parameters

# aws_lambda/demo/query.py
def lambda_handler(event, context):
    name = event.get('queryStringParameters', {}).get('name', 'Guest')
    return {
        'statusCode': 200,
        'body': f'Hello, {name}!'
    }

Lambda reading query parameters from API Gateway and responding.

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AWS Lambda Function with JSON Response

# aws_lambda/demo/json.py
def lambda_handler(event, context):
    return {
        'statusCode': 200,
        'headers': {'Content-Type': 'application/json'},
        'body': '{"message": "Hello JSON!"}'
    }

Lambda returning JSON data.

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AWS Lambda Function Handling POST Requests

# aws_lambda/demo/post.py
def lambda_handler(event, context):
    if event.get('httpMethod') == 'POST':
        body = event.get('body')
        return {
        'statusCode': 200,
        'body': f'Received: {body}'
        }
    return {
        'statusCode': 405,
        'body': 'Method Not Allowed'
    }

Lambda processing POST request body from API Gateway.

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AWS Lambda Function Using Environment Variables

# aws_lambda/demo/env.py
import os
def lambda_handler(event, context):
    api_key = os.environ.get('MY_API_KEY', 'NotSet')
    return {
        'statusCode': 200,
        'body': f'API Key length: {len(api_key)}'
    }

Lambda accessing environment variables.

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AWS Lambda Function Redirect

# aws_lambda/demo/redirect.py
def lambda_handler(event, context):
    return {
        'statusCode': 302,
        'headers': {'Location': 'https://example.com'},
        'body': ''
    }

Lambda returning a redirect response.

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AWS Lambda Function with Custom Headers

# aws_lambda/demo/headers.py
def lambda_handler(event, context):
    return {
        'statusCode': 200,
        'headers': {'X-Custom-Header': 'LambdaExample'},
        'body': 'Custom headers added'
    }

Lambda adding custom headers in response.

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AWS Lambda Function Fetching External API

# aws_lambda/demo/fetch.py
import requests
def lambda_handler(event, context):
    response = requests.get('https://api.github.com')
    return {
        'statusCode': 200,
        'body': response.text
    }

Lambda fetching data from an external API and returning it.

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AWS Lambda Function Returning HTML

# aws_lambda/demo/html.py
def lambda_handler(event, context):
    html = '<!DOCTYPE html><html><body><h1>Hello HTML!</h1></body></html>'
    return {
        'statusCode': 200,
        'headers': {'Content-Type': 'text/html'},
        'body': html
    }

Lambda responding with a simple HTML page.

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AWS Lambda Function Conditional Response

# aws_lambda/demo/method.py
def lambda_handler(event, context):
    method = event.get('httpMethod')
    if method == 'POST':
        return {'statusCode': 200, 'body': 'You sent a POST request'}
    return {'statusCode': 200, 'body': 'You sent a GET request'}

Lambda responding differently based on HTTP method.

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Frequently Asked Questions about Aws-lambda

What is Aws-lambda?

AWS Lambda is a serverless compute service that lets developers run code without provisioning or managing servers, automatically scaling with incoming requests.

What are the primary use cases for Aws-lambda?

Serverless APIs via API Gateway. Event-driven data processing. Scheduled tasks with CloudWatch Events. File processing for S3 uploads. Microservices and backend logic for apps

What are the strengths of Aws-lambda?

Seamless scaling for workloads of any size. Tightly integrated with AWS services. Supports multiple languages and custom runtimes. Serverless - no servers to provision or maintain. Flexible event-driven architecture

What are the limitations of Aws-lambda?

Execution time limited (default 15 minutes max). Cold-start latency for some runtimes. Vendor lock-in to AWS ecosystem. Resource limits on memory, ephemeral storage, and concurrency. Debugging and local testing can be complex

How can I practice Aws-lambda typing speed?

CodeSpeedTest offers 10+ real Aws-lambda code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.

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Code Sample Descriptions

Simple AWS Lambda Function (Python)

# aws_lambda/demo/lambda_function.py
def lambda_handler(event, context):
    return {
        'statusCode': 200,
        'body': 'Hello, Lambda!'
    }

A simple AWS Lambda function in Python that returns 'Hello, Lambda!' when invoked.

Let’s Try →

AWS Lambda Function with Query Parameters

# aws_lambda/demo/query.py
def lambda_handler(event, context):
    name = event.get('queryStringParameters', {}).get('name', 'Guest')
    return {
        'statusCode': 200,
        'body': f'Hello, {name}!'
    }

Lambda reading query parameters from API Gateway and responding.

Let’s Try →

AWS Lambda Function with JSON Response

# aws_lambda/demo/json.py
def lambda_handler(event, context):
    return {
        'statusCode': 200,
        'headers': {'Content-Type': 'application/json'},
        'body': '{"message": "Hello JSON!"}'
    }

Lambda returning JSON data.

Let’s Try →

AWS Lambda Function Handling POST Requests

# aws_lambda/demo/post.py
def lambda_handler(event, context):
    if event.get('httpMethod') == 'POST':
        body = event.get('body')
        return {
        'statusCode': 200,
        'body': f'Received: {body}'
        }
    return {
        'statusCode': 405,
        'body': 'Method Not Allowed'
    }

Lambda processing POST request body from API Gateway.

Let’s Try →

AWS Lambda Function Using Environment Variables

# aws_lambda/demo/env.py
import os
def lambda_handler(event, context):
    api_key = os.environ.get('MY_API_KEY', 'NotSet')
    return {
        'statusCode': 200,
        'body': f'API Key length: {len(api_key)}'
    }

Lambda accessing environment variables.

Let’s Try →

AWS Lambda Function Redirect

# aws_lambda/demo/redirect.py
def lambda_handler(event, context):
    return {
        'statusCode': 302,
        'headers': {'Location': 'https://example.com'},
        'body': ''
    }

Lambda returning a redirect response.

Let’s Try →

AWS Lambda Function with Custom Headers

# aws_lambda/demo/headers.py
def lambda_handler(event, context):
    return {
        'statusCode': 200,
        'headers': {'X-Custom-Header': 'LambdaExample'},
        'body': 'Custom headers added'
    }

Lambda adding custom headers in response.

Let’s Try →

AWS Lambda Function Fetching External API

# aws_lambda/demo/fetch.py
import requests
def lambda_handler(event, context):
    response = requests.get('https://api.github.com')
    return {
        'statusCode': 200,
        'body': response.text
    }

Lambda fetching data from an external API and returning it.

Let’s Try →

AWS Lambda Function Returning HTML

# aws_lambda/demo/html.py
def lambda_handler(event, context):
    html = '<!DOCTYPE html><html><body><h1>Hello HTML!</h1></body></html>'
    return {
        'statusCode': 200,
        'headers': {'Content-Type': 'text/html'},
        'body': html
    }

Lambda responding with a simple HTML page.

Let’s Try →

AWS Lambda Function Conditional Response

# aws_lambda/demo/method.py
def lambda_handler(event, context):
    method = event.get('httpMethod')
    if method == 'POST':
        return {'statusCode': 200, 'body': 'You sent a POST request'}
    return {'statusCode': 200, 'body': 'You sent a GET request'}

Lambda responding differently based on HTTP method.

Let’s Try →

Frequently Asked Questions about Aws-lambda

What is Aws-lambda?

AWS Lambda is a serverless compute service that lets developers run code without provisioning or managing servers, automatically scaling with incoming requests.

What are the primary use cases for Aws-lambda?

Serverless APIs via API Gateway. Event-driven data processing. Scheduled tasks with CloudWatch Events. File processing for S3 uploads. Microservices and backend logic for apps

What are the strengths of Aws-lambda?

What are the limitations of Aws-lambda?

How can I practice Aws-lambda typing speed?

CodeSpeedTest offers 10+ real Aws-lambda code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.