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OCTOBER 25, 2021

What is API Testing? What Are the Advantages and Drawbacks?

    What is API Testing

    An API facilitates communication among software components (Application Programming Interface). API testing is a valuable resource for businesses, and you should make use of it as well. For the software framework to satisfy the requirements, APIs must be verified in both staging and production environments.

    Let's talk about how API testing may help your team by how your team handles your research strategy.

    What is API Testing?

    API is a common abbreviation for an application programming interface. To enable communication and interaction across programs, APIs "open up" a collection of methods and processes to other programmers. To guarantee that an API is secure, reliable, and scalable, it must be thoroughly tested.

    API testing is distinct from UI testing since it identifies problems early on. HTTP and SMTP are two examples of internet protocols used by APIs to accept requests and respond. Apps with various API capabilities are investigated using API tests, which change the parameters for each API request in different ways to check the functioning and point out problems.

    The following elements may be tested as part of an API:

    • Functional Testing
    • Load Testing
    • Security Testing

    It takes a JSON or XML payload and returns an API response code and response content as part of the functional testing process. This is done through a chain of rigorous testing under different loads in order to find out how much traffic an API can handle before being overburdened. Penetration testing validates authentication and examines security vulnerabilities such as those related to authentication and sensitive data sent via HTTP.

    API Testing In Software Development Has Many Benefits:


    1. Efficiency In Terms of Time

    API testing may begin much earlier in the development cycle than GUI testing since it does not need the GUI to be completed. Automated API testing helps you speed up the feedback loop and identify problems faster since they give test results much more quickly and substantially expedite development processes.

    In addition, API tests take a lot less time than UI tests to complete. There is no comparison between UI testing and API tests when it comes to rendering and loading time. Let's say that registering and logging in via the user interface takes 3 to 5 minutes, while API testing just takes 30 seconds.

    2. Lowered Expenses

    It has a strong connection to the concept of time effectiveness.

    There's a strong correlation between this advantage and the preceding one in terms of cost-effectiveness. The improved speed at which automated API tests may be executed results in more effective and efficient use of resources, which in turn reduces testing expenses.

    Before doing any GUI testing, API tests may be run as soon as the business logic is established. As a result, you'll be able to catch the problem early on. Early detection reduces the cost of application modifications since fixing it is less costly. To keep project expenses down, API testing allows the QA team to identify and fix problems early on.

    3. Independent Of Technological Advancement

    Since the data is sent using JSON or XML and compromised HTTP requests and HTTP replies, API testing is language-independent. As a result, the QA team is allowed to use any language that works with these technologies (JavaScript, Java, Ruby, Python, PHP, etc.).

    4. A Greater Level of Stability In The Testing

    API interfaces, in contrast to graphical user interfaces (GUIs), are extremely stable and do not alter to suit new demands from stakeholders and users. To ensure that QA engineers have quick access to updated test suites, APIs are usually included with extensive documentation. API tests are also considerably simpler to maintain as a result of their inherent stability.

    5. Improved Test Coverage

    The breadth and level of detail of automated API testing are often greater than that of unit tests. In contrast to the narrow emphasis of unit tests, which look at the individual functionalities of an application as a whole, issues often emerge when a project has many layers.

    Unit tests won't catch these bugs, but API tests are specially designed to ensure that all system components work as intended before they are used. API testing aids in the discovery of interface, server, and database flaws, resulting in improved overall software quality and a better user experience for end-users.

    API Testing Tools May Provide Efficiency Advantages Such As:


    • QA teams may now run more test cycles in the same amount of time.
    • Thus, more tests will be run in a shorter period of time, and they will be more diverse.
    • This will save time by eradicating the need to manually run tests prior to UAT.


    API testing is widely seen as a better match for Agile methods' Continuous Testing. Insufficiently tested APIs may lead to problems both in the API and in the calling program, therefore they should be thoroughly tested. In software engineering, it's a required test.

    Adarsh Kumar Singh is a technology writer with a passion for coding and programming. With years of experience in the technical field, he has established a reputation as a knowledgeable and insightful writer on a range of technical topics.