📌 List of Features of AWS API Gateway

AWS API Gateway offers a wide range of features for creating, deploying, securing, and monitoring APIs. Below is a comprehensive list of key features:

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1️⃣ API Creation & Management

✅ Supports Multiple API Types → Create REST, HTTP, and WebSocket APIs.
✅ Custom Domain Names → Assign your own domain names with AWS Certificate Manager (ACM).
✅ Versioning & Staging → Deploy APIs in multiple stages (dev, test, prod).
✅ Request & Response Transformation → Modify API requests/responses using mapping templates.
✅ Mock Integration → Create test APIs without backend integration.

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2️⃣ Security & Authentication

✅ AWS IAM Authentication → Secure APIs using IAM roles & policies.
✅ Amazon Cognito Integration → OAuth2-based authentication.
✅ API Keys & Usage Plans → Control API access with API keys, rate limits, and quotas.
✅ Lambda Authorizers → Implement custom authentication logic (JWT, OAuth).
✅ AWS Web Application Firewall (WAF) → Protect APIs from DDoS attacks & malicious traffic.

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3️⃣ Traffic Control & Performance

✅ Throttling & Rate Limits → Prevent API overuse with per-method rate limits.
✅ API Gateway Caching → Store responses and reduce backend load.
✅ Latency-Based Routing → Route API requests to the nearest backend for performance.
✅ Request Validation → Validate API requests against schemas & required parameters.

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4️⃣ Integration with AWS Services

✅ AWS Lambda Integration → Create serverless APIs.
✅ Amazon DynamoDB Integration → Directly connect to DynamoDB tables.
✅ AWS Step Functions → Orchestrate complex workflows.
✅ Amazon S3, SNS, & SQS Integration → Manage data, notifications, and queues.
✅ VPC Link → Securely connect API Gateway to private resources in a VPC.

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5️⃣ Monitoring & Logging

✅ AWS CloudWatch Logging → Track API requests, latencies, and errors.
✅ AWS X-Ray Tracing → Debug API requests with distributed tracing & analysis.
✅ Access Logging → Capture detailed request logs for analytics.
✅ AWS CloudTrail → Monitor API configuration changes.

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6️⃣ Cost Optimization & Scalability

✅ Auto Scaling → Handles millions of requests per second with built-in scaling.
✅ Pay-as-You-Go Pricing → No upfront costs; pay only for API calls & data transfer.
✅ Multi-Region Deployment → Deploy APIs in multiple AWS regions for global availability.

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7️⃣ Developer-Friendly Features

✅ SDK Generation → Generate SDKs for Java, JavaScript, Python, Ruby, iOS, Android.
✅ CORS (Cross-Origin Resource Sharing) → Enable cross-domain API access.
✅ GraphQL Support via AppSync → API Gateway can proxy requests to AWS AppSync.
✅ Multi-Tenant API Management → Manage API access for multiple users & organizations.

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🔹 Summary Table of API Gateway Features

Feature Category	Key Features
API Types	REST, HTTP, WebSocket
Security	IAM, Cognito, API Keys, WAF, Lambda Authorizers
Performance	Caching, Throttling, Latency-Based Routing
Integrations	Lambda, DynamoDB, S3, SNS, Step Functions
Monitoring	CloudWatch, X-Ray, CloudTrail, Access Logs
Scalability	Auto Scaling, Multi-Region Deployment
Developer Tools	SDK Generation, CORS, GraphQL Proxy

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1️⃣ What is AWS API Gateway?

AWS API Gateway allows you to create RESTful, HTTP, and WebSocket APIs. These APIs act as an entry point for applications, handling routing, authentication, monitoring, and security.

✅ Use Cases:

• Creating serverless applications with AWS Lambda.
• Exposing RESTful or WebSocket APIs.
• Handling API traffic at scale.
• Connecting mobile, web, and IoT applications to backend services.

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2️⃣ AWS API Gateway Features

🔹 1. API Management

• Allows easy deployment, monitoring, and scaling of APIs.

🔹 2. Security & Authentication

• Supports AWS IAM, Cognito, API Keys, and OAuth2.

🔹 3. Traffic Management

• Rate limiting and throttling to prevent API abuse.

🔹 4. Integration with AWS Services

• Works with AWS Lambda, DynamoDB, EC2, SNS, Step Functions, S3.

🔹 5. Request Transformation

• Modify API requests and responses using mapping templates.

🔹 6. Monitoring & Logging

• Integrated with CloudWatch for logging and analytics.

🔹 7. Caching

• Reduces backend load by caching responses.

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3️⃣ Types of APIs in AWS API Gateway

API Type	Use Case	Cost
REST API	Fully managed RESTful API (supports API keys, IAM, OAuth2)	High
HTTP API	Lightweight alternative to REST API (faster & cheaper)	Low
WebSocket API	Real-time, bidirectional communication (chat apps, live updates)	Medium

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4️⃣ How AWS API Gateway Works

📌 Workflow

1. A client (browser, mobile app) makes a request to API Gateway.
2. API Gateway routes the request to a backend service (AWS Lambda, EC2, DynamoDB).
3. The backend processes the request and returns a response.
4. API Gateway formats the response and sends it to the client.

📌 Integration Types

Integration Type	Description
AWS Lambda	Serverless backend execution
HTTP Backend	Connects to external web services
AWS Services	Direct integration with DynamoDB, S3, SNS
Mock Integration	Returns static responses for testing

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5️⃣ Core Components of AWS API Gateway

Component	Description
Resource	Defines an endpoint (e.g., /users, /orders).
Method	HTTP methods (GET, POST, PUT, DELETE).
Integration	Connects API Gateway to a backend (Lambda, EC2).
Stage	API versions (dev, staging, prod).
Usage Plan	Defines API rate limits and quotas.

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6️⃣ Step-by-Step Guide: Creating an API in AWS API Gateway

Step 1: Create an API

1. Go to AWS Console → API Gateway.
2. Click Create API.
3. Select REST API, HTTP API, or WebSocket API.
4. Click Build.

Step 2: Create a Resource

1. Click Actions → Create Resource.
2. Enter a Resource Name (/users).
3. Click Create Resource.

Step 3: Create a Method

1. Select the resource (/users).
2. Click Create Method → Select GET.
3. Choose Lambda Function as the integration type.
4. Enter Lambda Function Name.
5. Click Save.

Step 4: Deploy the API

1. Click Actions → Deploy API.
2. Create a new Stage (dev or prod).
3. Copy the Invoke URL.

Step 5: Test the API

curl -X GET https://your-api-id.execute-api.us-east-1.amazonaws.com/dev/users

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7️⃣ Integrating AWS Lambda with API Gateway

1️⃣ Create a Lambda Function

import json

def lambda_handler(event, context):
    return {
        "statusCode": 200,
        "body": json.dumps({"message": "Hello from Lambda!"})
    }

2️⃣ Deploy API Gateway with Lambda

• Follow Step 6 above and select Lambda Integration.

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8️⃣ Security: Authentication & Authorization

Security Method	Description
API Keys	Tracks API usage.
IAM Roles	Secure API with AWS IAM permissions.
Amazon Cognito	OAuth2 authentication.
Lambda Authorizer	Custom JWT validation.

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9️⃣ Monitoring & Logging in API Gateway

• Enable CloudWatch Logging: aws logs tail /aws/api-gateway/access-logs
• Use AWS X-Ray for tracing API calls.

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🔟 AWS API Gateway Pricing

API Type	Free Tier	Cost
REST API	1M requests/month	$3.50 per million requests
HTTP API	1M requests/month	$1.00 per million requests
WebSocket API	1M messages/month	$1.00 per million messages

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1️⃣1️⃣ Best Practices for API Gateway

✅ Use API Caching to improve performance.
✅ Enable API Key Throttling to prevent abuse.
✅ Use AWS WAF for security.
✅ Monitor logs using CloudWatch.

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1️⃣2️⃣ Hands-on AWS API Gateway Tutorials

Tutorial	Link
Create a REST API with Lambda Integration	AWS Docs
Secure API with Cognito	AWS Guide
Enable Logging with CloudWatch	AWS Guide

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1️⃣3️⃣ Common API Gateway Errors & Troubleshooting

Error	Solution
403 Forbidden	Check IAM permissions.
Execution failed due to configuration error	Verify Lambda function integration.
Too Many Requests (429)	Increase throttling limits.

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📌 List of Services AWS API Gateway Can Integrate With (50+ Examples)

AWS API Gateway can integrate with a wide range of AWS and third-party services. Below is a comprehensive list of at least 50 integrations, categorized into AWS services and external (non-AWS) services.

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🔹 1️⃣ AWS Services That Integrate with API Gateway

✅ Compute & Serverless

1. AWS Lambda → Run serverless APIs.
2. Amazon EC2 → Direct API calls to virtual machines.
3. AWS App Runner → Run containerized applications.
4. AWS Batch → Trigger batch processing jobs.
5. AWS Fargate → Run APIs for serverless containers.

✅ Storage & Databases

6. Amazon S3 → Expose S3 bucket objects via API.
7. Amazon DynamoDB → CRUD operations on NoSQL database.
8. Amazon RDS → Connect to MySQL, PostgreSQL, or other managed databases.
9. Amazon Aurora → API Gateway can access Aurora databases.
10. Amazon Redshift → Query large-scale data warehouses.

✅ Networking & Security

11. AWS WAF → Protect APIs from DDoS attacks.
12. Amazon VPC → Private API connectivity.
13. AWS Direct Connect → Secure on-premise integrations.
14. AWS Shield → DDoS protection for APIs.
15. AWS CloudFront → Content delivery network (CDN) for APIs.

✅ Machine Learning & AI

16. Amazon SageMaker → Deploy machine learning models via API.
17. Amazon Comprehend → Perform NLP (Natural Language Processing) tasks.
18. Amazon Rekognition → Image & video analysis via API.
19. Amazon Lex → Integrate chatbots and voice recognition.
20. Amazon Polly → Convert text to speech via API.

✅ Monitoring & Logging

21. AWS CloudWatch → Monitor API calls and errors.
22. AWS X-Ray → Trace API requests end-to-end.
23. AWS CloudTrail → Track API activity logs.
24. AWS Config → Manage API compliance & configurations.
25. Amazon Kinesis → Stream API event data in real-time.

✅ DevOps & Developer Tools

26. AWS CodePipeline → Automate API deployments.
27. AWS CodeBuild → Automate API testing & builds.
28. AWS CodeDeploy → Manage rolling updates of APIs.
29. AWS CloudFormation → Infrastructure as Code (IaC) for API Gateway.
30. AWS SAM (Serverless Application Model) → Deploy serverless APIs.

✅ Messaging & Event-Driven Integrations

31. Amazon SNS (Simple Notification Service) → Send alerts via API.
32. Amazon SQS (Simple Queue Service) → Queue messages for backend processing.
33. Amazon EventBridge → Route API events to other AWS services.
34. AWS Step Functions → Orchestrate workflows triggered via API Gateway.
35. Amazon MQ → API-driven message broker.

✅ Identity & Access Management

36. AWS IAM (Identity & Access Management) → Secure API access.
37. AWS Cognito → Implement authentication & OAuth2 for APIs.
38. AWS Secrets Manager → Store API credentials securely.
39. AWS Certificate Manager (ACM) → Manage SSL/TLS certificates for APIs.
40. Amazon Resource Access Manager (RAM) → Share API Gateway resources across accounts.

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🔹 2️⃣ External (Non-AWS) Services That Can Integrate with API Gateway

✅ Cloud & SaaS Platforms

41. Google Cloud Functions → API Gateway as a frontend for Google Cloud functions.
42. Microsoft Azure Functions → API Gateway calling Azure services.
43. IBM Cloud → API Gateway integrating IBM Watson AI APIs.
44. Salesforce → API Gateway exposing Salesforce APIs.
45. ServiceNow → API Gateway interacting with ServiceNow ITSM.

✅ Databases & Storage

46. MongoDB Atlas → Connect NoSQL databases with APIs.
47. PostgreSQL (Google Cloud SQL, AWS RDS, DigitalOcean) → API Gateway querying PostgreSQL databases.
48. Elasticsearch (Elastic Cloud, OpenSearch) → API Gateway interacting with search & analytics.

✅ Payment & Finance

49. Stripe → API Gateway handling payments via Stripe.
50. PayPal → API Gateway integrating PayPal transactions.
51. Plaid → Banking & financial data APIs through API Gateway.

✅ Authentication & Identity Management

52. Okta → API Gateway handling OAuth2 authentication via Okta.
53. Auth0 → Secure API access with Auth0 authentication.

✅ Collaboration & Productivity

54. Slack → API Gateway triggering Slack bots & notifications.
55. Zoom → API Gateway calling Zoom API for video conferencing.

✅ Social Media & Marketing

56. Facebook Graph API → API Gateway fetching Facebook data.
57. Twitter API → API Gateway interacting with Twitter data.
58. Google Ads API → API Gateway managing ad campaigns.

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🚀 Summary Table: AWS API Gateway Integrations

Category	Services
Compute & Serverless	Lambda, EC2, Fargate, Batch
Storage & Databases	S3, DynamoDB, RDS, Aurora
Networking & Security	VPC, WAF, Shield, Direct Connect
Machine Learning & AI	SageMaker, Rekognition, Polly
Monitoring & Logging	CloudWatch, X-Ray, CloudTrail
DevOps & Automation	CodePipeline, SAM, CloudFormation
Messaging & Events	SNS, SQS, EventBridge, Step Functions
Identity & Authentication	IAM, Cognito, Okta, Auth0
Payment & Finance	Stripe, PayPal, Plaid
Social Media & SaaS	Facebook API, Twitter API, Slack, Salesforce

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🔹 Conclusion

AWS API Gateway is highly flexible and can integrate with over 50+ AWS and non-AWS services. Whether you’re building serverless APIs, authentication layers, payment processing, or real-time applications, API Gateway is a powerful choice.