Top 100 API testing interview questions

API testing is an important part of the software development process, as it helps ensure that the APIs that are created are reliable, efficient, and secure. In this blog, we will provide a list of the top 100 API testing interview questions that you may be asked during an interview. These questions are designed to help you prepare for your interview and give you an idea of what types of topics and questions that may be covered.

Top 100 API Testing Interview Questions:-

1. What is API testing and why is it important?
2. What are the different types of API testing?
3. What are the key elements of an API?
4. What is a request and response in API testing?
5. What are some common API testing tools?
6. What is the role of a test plan in API testing?
7. What is the role of a test case in API testing?
8. What is the role of a test suite in API testing?
9. What are some common API testing challenges?
10. What are some common API testing best practices?
11. What is functional testing in API testing?
12. What is non-functional testing in API testing?
13. What is regression testing in API testing?
14. What is integration testing in API testing?
15. What is end-to-end testing in API testing?
16. What is security testing in API testing?
17. What is load testing in API testing?
18. What is stress testing in API testing?
19. What is performance testing in API testing?
20. What is compatibility testing in API testing?
21. What are some common functional testing techniques in API testing?
22. What are some common non-functional testing techniques in API testing?
23. What are some common regression testing techniques in API testing?
24. What are some common integration testing techniques in API testing?
25. What are some common end-to-end testing techniques in API testing?
26. What are some common security testing techniques in API testing?
27. What are some common load testing techniques in API testing?
28. What are some common stress testing techniques in API testing?
29. What are some common performance testing techniques in API testing?
30. What are some common compatibility testing techniques in API testing?
31. What are some common functional testing metrics in API testing?
32. What are some common non-functional testing metrics in API testing?
33. What are some common regression testing metrics in API testing?
34. What are some common integration testing metrics in API testing?
35. What are some common end-to-end testing metrics in API testing?
36. What are some common security testing metrics in API testing?
37. What are some common load testing metrics in API testing?
38. What are some common stress testing metrics in API testing?
39. What are some common performance testing metrics in API testing?
40. What are some common compatibility testing metrics in API testing?
41. What is the role of automation in API testing?
42. What are some common automation frameworks for API testing?
43. What are the benefits of using automation in API testing?
44. What are the challenges of using automation in API testing?
45. How do you decide which tests to automate in API testing?
46. What is the role of manual testing in API testing?
47. What are the benefits of using manual testing in API testing?
48. What are the challenges of using manual testing in API testing?
49. How do you decide which tests to perform manually in API testing?
50. How do manual and automation testing work together in API testing?
51. What is API mocking and why is it important in API testing?
52. What are some common tools for API mocking?
53. What is the role of API mocking in functional testing?
54. What is the role of API mocking in non-functional testing?
55. What is the role of API mocking in regression testing?
56. What is the role of API mocking in integration testing?
57. What is the role of API mocking in end-to-end testing?
58. What is the role of API mocking in security testing?
59. What is the role of API mocking in load testing?
60. What is the role of API mocking in stress testing?
61. What is the role of API mocking in performance testing?
62. What is the role of API mocking in compatibility testing?
63. How do you create API mock data?
64. How do you maintain API mock data?
65. How do you manage API mock data?
66. How do you validate API mock data?
67. How do you verify API mock data?
68. How do you test API mock data?
69. How do you debug API mock data?
70. What is API virtualization and why is it important in API testing?
71. What are some common tools for API virtualization?
72. What is the role of API virtualization in functional testing?
73. What is the role of API virtualization in non-functional testing?
74. What is the role of API virtualization in regression testing?
75. What is the role of API virtualization in integration testing?
76. What is the role of API virtualization in end-to-end testing?
77. What is the role of API virtualization in security testing?
78. What is the role of API virtualization in load testing?
79. What is the role of API virtualization in stress testing?
80. What is the role of API virtualization in performance testing?
81. What is the role of API virtualization in compatibility testing?
82. How do you create API virtual services?
83. How do you maintain API virtual services?
84. How do you manage API virtual services?
85. How do you validate API virtual services?
86. How do you verify API virtual services?
87. How do you test API virtual services?
88. How do you debug API virtual services?
89. What is API security testing and why is it important?
90. What are some common tools for API security testing?
91. What are some common security vulnerabilities in APIs?
92. What are some common security threats in APIs?
93. What are some common security risks in APIs?
94. What are some common security controls in APIs?
95. Why We Should Not Use API everywhere and why we use it?
96. What are some common security standards in APIs?
97. What are some common security best practices in APIs?
98. What are some common security testing techniques in APIs?
99. What are some common security testing metrics in APIs?
100. How do you integrate security testing into the API testing process?

API testing is a type of software testing that focuses on testing the application programming interfaces (APIs) of a system to ensure that they are working correctly and providing the expected outputs. API testing involves testing the functionality, reliability, performance, and security of the APIs, as well as the integration of the APIs with other systems and components.

API testing is an important part of the software development process, as APIs play a crucial role in allowing different systems and components to communicate and interact with each other. By testing the APIs of a system, developers and testers can ensure that the system is working as expected and that any issues or bugs in the APIs are identified and resolved before the system is released.

There are several common techniques and tools used in API testing, including manual testing, automated testing, and API mocking. Manual testing involves manually sending test requests to the APIs and verifying the responses, while automated testing involves using specialized software to automatically send and verify test requests. API mocking involves creating fake or mock versions of the APIs for testing purposes, which can be useful for testing the integration of the APIs with other systems without having to rely on the actual APIs.

Overall, API testing is an important part of the software development process, and it is crucial for ensuring the functionality, reliability, performance, and security of the APIs in a system.

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