Application Programming Interfaces (APIs) are a basic structure block of processes and functions that enable mobile application development that allows an easy way to data and other application services features. In other words, it connects different applications and gives them compliments. API development is a boon for developers as well as enterprises. When writing a new program, a developer does not have to begin from scratch to build a core application. Alternatively, they can use some functionalities using existing pieces to do a better job.