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Amazon API Gateway

Amazon API Gateway is a fully managed service that makes it simple for developers to construct, publish, maintain, monitor, and protect APIs at any size.

Why API Gateway?

Amazon Web Services (AWS) offers a plethora of different tools for developers and business owners to use that make things run more efficiently. API Gateway is available as a public or private cloud service. Data, business logic, and functionality from your backend services are accessible to apps through APIs, which serve as the “front door” to those services. It is possible to develop RESTful APIs and WebSocket APIs that enable real-time two-way communication applications through the use of the API Gateway. API Gateway is compatible with containerized and serverless workloads, as well as web-based applications and web services. API Gateway is responsible for all of the tasks involved in accepting and processing up to hundreds of thousands of API calls at the same time. These tasks include traffic management (including CORS support), authorization and access control (including throttling), monitoring (including API version management), and API version management. API Gateway does not charge any minimum fees or require any upfront costs. You are charged for the API calls you get as well as the amount of data transferred out, and thanks to the API Gateway’s tiered pricing mechanism, you may minimize your costs as your API usage increases in volume.

How it Works


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It’s simple for developers to publish, maintain, monitor, protect, and run APIs at any scale using the Amazon API Gateway, which is a fully managed service provided by Amazon. You can pay as you go for this service, and it will handle all of the undifferentiated heavy lifting necessary in securely and reliably running APIs on a large-scale basis.

It is becoming increasingly popular to make backend systems and data accessible to apps through application programming interfaces (APIs) as a result of the proliferation of mobile devices and the rise of the Internet of Things. In order to support so many apps and communities of developers who rely on APIs, an increasing amount of time and effort is being devoted to their creation and management.

Several programming languages, including JavaScript, iOS, and Android, can be used to build client SDKs for use with API Gateway. API Gateway can also generate client SDKs for use with other API Gateway services, such as web services.

RESTful and WebSocket API Support

API Gateway allows you to develop RESTful APIs using HTTP or REST APIs. APIs without API management features should be built using HTTP APIs. Serverless HTTP APIs save up to 71% on costs and 60% on latency compared to REST APIs through API Gateway. API Gateway provides REST APIs for workloads that require API proxy capabilities and API management tools like consumption plans and API keys. Visit our documentation for a comparison of HTTP and REST API offered features. Use WebSocket APIs to construct real-time two-way communication apps like chat and streaming dashboards.

Private AWS ELB & Cloud Map integrations

API Gateway allows you to route requests to VPC resources. You can use HTTP APIs to develop APIs for private ALBs, NLBs, and IP-based services like ECS jobs.


By limiting the amount of requests per second for each HTTP method in your APIs, API Gateway helps you manage traffic. This gives you more time to worry about more important business endeavors. A cache with adjustable keys and time-to-live in seconds for your API data can help you avoid visiting your backend services every time.

Easy API Development

With API Gateway, you can easily develop a custom API to call AWS Lambda code. This includes calling AWS Lambda code, AWS Step Function state machines, AWS Elastic Beanstalk, Amazon EC2, and other web services with publicly available HTTP endpoints. The API Gateway console allows you to define your REST API, manage its lifecycle, produce client SDKs, and view API analytics.

API Operations Monitoring

After an API is deployed, API Gateway provides a dashboard to visually monitor service calls. The API Gateway console uses Amazon CloudWatch to track API calls, latency, and error rates. Due to CloudWatch recording monitoring data, you can establish custom alarms on API Gateway APIs. To help debugging, API Gateway can log API execution problems to CloudWatch Logs.

Authorization from Amazon Web Services

API Gateway can help you use signature version 4 for REST APIs and WebSocket APIs in order to authenticate and validate API calls to AWS services. Using AWS Identity and Access Management (IAM) and access policies, you can grant APIs and other AWS resources access with signature version 4 authentication. In addition, bearer tokens such as JWT tokens and SAML assertions can be verified and authorized using AWS Lambda functions.

API Keys for External Developers

This helps you manage the ecosystem of third-party developers accessing your REST APIs through API Gateway. It is possible to specify fine-grained access rights on each API key and distribute them to third-party developers to access your APIs through API Gateway. Each API key has its own set of throttling and request quota restrictions, which may be specified in your plans. This feature is fully optional and must be activated for each technique.

Generation of SDKs

API Gateway can produce client SDKs for a variety of platforms so that you can easily test new APIs from your applications and offer SDKs to third-party developers. AWS credentials are used to sign requests and manage API keys in the created SDKs. Ruby and Objective-C/Swift client SDKs can be generated by API Gateway for all of the above platforms. Calling the get-sdk command in AWS CLI will build and download an SDK for an API for a supported platform.

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Management of the API Lifecycle

Apps will be able to continue to use older versions of an API even after the most recent version has been released utilising API Gateway, which supports RESTful APIs. It’s easy to keep track of numerous API versions at once with API Gateway’s release management features. For each API stage, you can choose which endpoints you want to communicate with. Using API Gateway, it is possible to assign a custom domain name to specific API stages and versions. You can test new API versions that upgrade or add new functionality to prior API releases and assure backward compatibility when user communities shift to accept the latest release.


  • API development 

For testing and iteration, API Gateway lets you run many versions of the same service at the same time. There are no minimum fees or upfront commitments for API calls and data transfer out, and you just pay for what you use.

  • Effectiveness in any context

Using Amazon CloudFront, we are able to deliver the lowest possible latency for API requests and responses to end users. It is important to limit traffic and only allow authorised API calls in order to protect the back-end operations from being overloaded.

  • Scaled-down cost savings

Tiered pricing for API queries is provided by API Gateway. Even when the number of API calls across your AWS accounts grows, you can cut your API request fees to just $0.90 per million at the highest tier.

  • Streamlined reporting

The API Gateway dashboard allows you to monitor performance metrics and information on API calls, data latency, and error rates using Amazon CloudWatch.

  • Intuitive security measures are available.

Use AWS Identity and Access Management (IAM) with Amazon Cognito to grant users access to your APIs. API Gateway has native OIDC and OAuth2 support if you utilise OAuth tokens. Lambda authorizers from AWS Lambda can be used for custom authorisation requirements.

  • Flexible security controls

Authorize access to your APIs with AWS Identity and Access Management (IAM) and Amazon Cognito. If you use OAuth tokens, API Gateway offers native OIDC and OAuth2 support. To support custom authorization requirements, you can execute a Lambda authorizer from AWS Lambda.

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API Types:


Using HTTP APIs, you may create RESTful APIs that are designed for serverless workloads and HTTP backends. HTTP APIs are the most appropriate solution for developing APIs that just require API proxy capabilities, such as web services. API Gateway also provides REST APIs, which are useful if your APIs require API proxy capabilities as well as API administration functions in a single solution.


Using WebSocket APIs, you can create real-time two-way communication applications, such as chat apps and streaming dashboards, in a matter of minutes. API Gateway maintains a permanent connection to your backend service in order to handle message transfer between your clients and your backend service.


With Amazon API Gateway, you only pay for the time that your APIs are actually being used. There are no minimum costs or commitments required up front. When using HTTP APIs or REST APIs, you only pay for the API calls you get and the amount of data moved out of the system. For Private APIs, there are no data transfer out fees to be concerned about. When using Private APIs in API Gateway, however, AWS PrivateLink charges will be incurred. Alternatively, API Gateway offers optional data caching that is charged at an hourly rate that varies depending on the cache size you choose. In the case of WebSocket APIs, you only pay when your APIs are in use, and the amount you pay is based on the quantity of messages delivered and received as well as the number of connection minutes.


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