The growing number of web services exposed through APIs by cloud providers also has encouraged the creation of cloud-specific applications, internet of things (IoT) efforts and apps to support mobile devices and users.ĪPIs add a digital layer to present a company's data and enterprise assets through APIs, with requisite governance and security, and this can enhance customer, employee and partner interactions. This reduces development time and cost, and mitigates the risk of errors.
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Software that was custom-developed for a specific purpose is now often written to reference APIs that provide broadly useful features. The current industry trend is largely to use REST APIs, particularly for web interactions.ĪPIs have steadily improved the quality and delivery of software and services.
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SOAP requires less low-level infrastructure-related code than does REST, but REST APIs are easier to scale and redeploy, simpler to implement and integrate with websites and services. The most common architectures for APIs are representational state transfer ( REST) and Simple Object Access Protocol ( SOAP), which defines a standard communication protocol specification for XML-based message exchange.
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Web APIs can be called through any programming language, but can also be accessed by webpages created in HTML or application generator tools. APIs also provide an audit trail that details system access: who or what, and when.Īpplications that call APIs were traditionally written in specific programming languages. Access is authenticated to a service or portion of functionality, against predefined roles that govern who or what service can access specific actions or data. The software that wants to access the features and capabilities of the API is said to "call" it, and the software that creates the API is said to "publish" it.ĪPIs authorize and grant access to data that is requested by users and other applications. The second is a software interface written to that specification and published in some way for use. The first is a specification that describes how information is exchanged between programs, done in the form of a request for processing and a return of the necessary data. How do APIs work?ĪPIs are made up of two related elements. The web, software designed to exchange information via the internet and cloud computing have all combined to increase the interest in APIs in general, and services in particular. For example, on a real estate website, one API might publish available real estate properties by geography, while a second API provides the visitor with current interest rates and third API offers a mortgage calculator.
APIs are implemented by function calls composed of verbs and nouns the required syntax is described in the documentation of the application being called. In the early days of Web 2.0, the concept of integrating data and applications from different sources was called a mashup.Īny data can be shared with an application program interface. An API defines the correct way for a developer to request services from an operating system (OS) or other application, and expose data within different contexts and across multiple channels. An application program interface (API) is code that allows two software programs to communicate with each other.
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