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API Testing

API is the communication and data exchange system between the different software. API defines that how one software interact with the another software. A Software have many function and when these functions are called from another software then we call it API. API stand for Application Programming Interface.
Now we come on the topic of what is the API Testing. Before understanding the API Testing you need to to understand the Software Architecture.
There are three layers in any Software Architecture

  • Presentation Layer: This is the User Interface Layer. This layer provide the translation of task and provide in a mode which can be understandable by user.
  • Logic Layer: This layer coordinate the application, process command, make logical decisions and perform calculations. It also move the data between 2 surrounding layers. 
  • Database Layer: Here is information is stored and retrieve from database or file system. This information first passed to the Logic layer then visible to the users in the Presentation Layer.
API Testing in concentrate over the Logic Layer and not over the Presentation layer so API Testing is differ from the GUI Testing. In API Testing you need a software to send call to API so here you need to Testing Tools to drive API or you should write down his/her own code to Test the API. Now you know that API Testing the White Box Testing. 



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