Differences between API Testing and Unit Testing Last Updated : 11 Dec, 2023 Comments Improve Suggest changes Like Article Like Report API TestingAn application programming interface (API) is a type of programming interface. API can be thought of as a bridge between two software systems that allows them to communicate. API testing entails evaluating application programming interfaces (APIs) both independently and as part of integration testing to see if they fulfill functionality, reliability, performance, and security requirements. API tests are only run when the build is complete.As the user interface with which an end-user will interact, API testing must represent the system as a whole.API testing is a type of black-box testing that focuses solely on the system under the test's ultimate output. Methods of API TestingSecurity testingAutomated testingDiscovery testingUsability testingTools used in API TestingREST assuredTricentis ToscaPing APIPostmanKatalon StudioSoap UIUnit TestingIts goal is to test each individual module as it becomes available and to verify whether the module carries out the mandatory functionality. Unit testing can be carried either manually or automatically. Ensure that the code is correct.Aid developers in comprehending the code base and allowing them to make changes fast.Save money by fixing bugs early in the development cycle.Unit testing has two types:Manual testingAutomated testing Tools used in Unit TestingNUnitEMMAPHPUnitJtestJunitDifference between API Testing and Unit TestingAPI Testing Unit Testing Access main functionality of the system employed by end-user and its more comprehensive as it is tested from user's perspective.Used to test each unit performs as expected or not. It is less comprehensive as it is tested in isolation.It is carried out by the QA team and testing is complex involving multiple systems and applications.It is carried out by developers and comparatively less complex as the code is tested early before integration and system testing.The functionality has been tested from beginning to end including entire product and features making it more time consuming.Functionalities are put to the test individually and is maintainable.Most of the time it is Black Box Testing.This is White Box Testing.Entire API functions are put to the test.UI testing is also a part of the process which helps in testing all the edge cases.All functional issues are thoroughly examined.Only the most basic functions are put to the testBroader in scopeThe scope is limited.After the build is finished, it is run.Usually performed prior to check-in. Comment More infoAdvertise with us Next Article Differences between API Testing and Unit Testing S sanketnagare Follow Improve Article Tags : Web Technologies PHP Web technologies PHP-Questions php +1 More Similar Reads Difference Between Unit Tests and Functional Tests The article focuses on discussing the differences between Unit Testing and Functional Testing. The following topics will be discussed here: What is Unit Testing?What is Functional Testing?Unit Testing vs Functional Testing Let's start discussing each of these topics in detail. What is Unit Testing? 3 min read Difference between Pytest and Unittest Pytest and Unittest are two popular options when it comes to Python testing frameworks. Pytest provides versatility and simplicity, enabling strong fixtures and succinct test code. However, Python's built-in testing framework, Unittest, offers a more conventional method with an object-oriented struc 8 min read Difference between Usability Testing and User Acceptance Testing (UAT) Usability Testing and User Acceptance Testing (UAT) are crucial for the software development lifecycle, but they contribute to different process aspects. In order to ensure that users have a positive experience with software, usability testing looks at how simple and efficient user interfaces are. A 9 min read Difference Between Unit, Functional, Acceptance, and Integration Tests Here, we will discuss the differences between unit testing, functional testing, acceptance testing, and integration testing. Unit Testing It is a testing technique wherein the simple or smallest units of a software program are examined personally for bugs and errors. These smallest units may be exam 7 min read REST API Testing and Manual Test Cases REST is a set of architectural styles that acts as an interface between physically separate components across the internet. In simple language, one can say that this allows the requesting system to access web resources by using a uniform and predefined set of rules. It is built on a client-server pa 11 min read Like