Application Programming Interface

Application Programming Interface (API) in Cloud Computing


A cloud’s Application Programming Interface (API) is that the software interface that lets a company’s infrastructure or applications connects to the cloud. This is often perhaps the foremost important place for standardization. Many vendors within the cloud space would really like to say overall leadership and control over the interfaces. Therefore, many various vendors are developing their own interfaces. This, in turn, means customers are likely to be forced to support multiple APIs. Managing multiple APIs means when applications are changed, there’s more programming involved, and there’s more potential for errors when too many APIs are supported.


An application programming interface, or API, allows companies to open up their applications’ data and functionality to external third-party developers, business partners, and internal departments within their companies. This enables services and products to speak with one another and leverage each other’s data and functionality through a documented interface. Developers don’t have to skills an API is implemented; they simply use the interface to speak with other products and services. API usage has rushed over the past decade, to the degree that many of the foremost common web applications today wouldn’t be possible without APIs.

How an API works?

An API may be a set of defined rules that specify how computers or applications communicate with each other. APIs sits between an application and therefore the web server, acting as an intermediary layer that processes data transfer between systems.

Here’s how an API works:

  1. A client application initiates an API call to retrieve information—also referred to as an invitation. This request is processed from an application to the online server via the API’s Uniform Resource Identifier (URI) and includes an invitation verb, headers, and sometimes, an invitation body.
  2. After receiving a legitimate request, the API makes a call to the external program or web server.
  3. The server guides a reply to the API by the demanded information.
  4. The API transfers the info to the initial requesting application.

While the info transfer will differ counting on the online service getting used, this process of requests and responses all happens through an API. Whereas an interface is meant to be used by humans, APIs are designed to be used by a computer or application.

APIs offer security intentionally because their position as middleman facilitates the abstraction of functionality between two systems—the API endpoint decouples the consuming application from the infrastructure providing the service. API calls usually include authorization credentials to scale back the danger of attacks on the server, and an API gateway can limit access to attenuate security threats. Likewise, during the exchange, HTTP headers, cookies, or query string parameters deliver extra security layers to the information.

For instance, deliberate an API offered by a payment processing service. Customers may enter their card information on the front end of an application for an eCommerce store. The payment processor doesn’t require access to the user’s bank account; the API creates a singular token for this transaction and includes it within the API call to the server. This ensures a better level of security against potential hacking threats.

Types of APIs

Nowadays, most application programming interfaces are web APIs that expose an application’s data and functionality over the web. Here are the four main sorts of web API:

  • Open APIs are open-source application programming interfaces we’ll access with the HTTP protocol. Also referred to as public APIs, they need defined API endpoints and request and response formats.

  • Spouse APIs are application programming interfaces exposed to or by strategic business partners. Normally, developers may access these APIs in self-service mode through a public API developer portal. They’re yet going to get to complete an onboarding process and obtain login credentials to access partner APIs.

  • Internal APIs are application programming interfaces that continue hidden from external users. These private APIs aren’t vacant for users outside of the corporate and are instead intended to enhance productivity and communication across different internal development teams.

  • Merged APIs join multiple data or service APIs. These services allow developers to access several endpoints during a single call. Composite APIs are useful in microservices architecture where performing one task may require information from several sources.

API’s role in cloud computing

APIs play many important roles in cloud computing. APIs make the platform extensible which may cause an upscale feature set. They likewise speed up the platform access and direct further well-organized management of platform security. They similarly support co-opt with other service providers. APIs ensure compliance and help with successful integration and interoperability. They create handling analytics as a simple task.

A profitable cloud provider sees well than to overlook the status of APIs, this error may bring large companies down. Even huge, well-established companies like Google can make this error. Once the business hurled Google Latitude and Google Buzz, the tech world was all abuzz about these exciting new services. But when Google did not release the APIs for the services, developers lost interest and therefore the services never came on the brink of garnering the recognition and usage that had been projected. The lesson- albeit you’re the most important internet company within the world, if you twiddle my thumbs the APIs for your platform release, you’ll pay the worth with a lackluster performance. Perhaps the foremost important aspect of successful APIs is that they ensure data portability and interoperability.

Mansoor Ahmed is Chemical Engineer, web developer, a writer currently living in Pakistan. My interests range from technology to web development. I am also interested in programming, writing, and reading.
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