What type of bugs are commonly found during API testing?

• A. Excessive documentation efforts
• B. Inactive error handling
• C. Missing or duplicate functionality
• D. Overly complex user interfaces

Answer: (C)

Missing or duplicate functionality is a common type of bug found during API testing because APIs are designed to provide specific functionalities to interact with a backend system. When testing an API, testers verify whether the intended functionalities are implemented correctly and are accessible as specified in the API documentation. If functionalities are missing, it can impede users from achieving their desired outcomes through the API. Additionally, duplicate functionality can confuse users and create inconsistencies in how the API operates, thus leading to a negative user experience.

When documenting and testing APIs, it's essential to ensure that each endpoint and method serves its unique purpose without redundancy. This scrutiny is crucial for maintaining clarity and efficiency in API usage, ensuring that all expected behaviors are represented without unnecessary duplicates. Identifying these issues during the testing phase allows developers to address them before deployment, thus enhancing the overall reliability and usability of the API.

Other choices like excessive documentation efforts do not directly pertain to functionality or performance of the API itself and do not represent a flaw in the API behavior. Inactive error handling may indicate bugs, but it's not as common as missing or duplicate functionalities because APIs ought to include basic error handling by design. Overly complex user interfaces refer more to frontend considerations than to the API testing domain, which focuses instead on backend