Application Programming Interface with a Case Study of SOA

A set of ways, procedures and tools used in programming to develop software operations is known as an Application programming interface (API). An API exposes the procedures, inputs, issues and underpinning types of a software element. An API separates features from their applications, enabling definitions and functionalities to evolve without degrading the interface. By providing all of the required building blocks, a good API makes developing a software easy. In this paper, APIs of Service Oriented Architecture (SOA) are implemented and discussed along with SOAP, JSON-RPC, XML-RPC, REST. APIs for securing Web services also focused by coding examples. A Web service request message and response messages are resulted through SOAP envelop and discussed in this paper.