Top 60 API Testing Interview questions and answers? Refer for concepts, revision and interview preparation?

 

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Check below link for question and answers with code:

Top API Interview Question 1-10

Top API INterview Questions 11-20

Top API AUTOMATION Interview Q&A - 21-30

 

Top 50 Selenium Automation Interview Q&A 

51. How to add .pem and .key file for authorization in testing an API using Postman?

Ans: Go to Postman Settings-->Certificate and then upload .pem under crt and key under key as shown in below screenshot:

Do remember to mention the server address under the host field

52. How to convert the API request in Postman to cURL command so that we can run it in the cloud setup?

Ans: In Postman tool go to the Code snippet and from the list select cURL as shown in below screenshot:

53. If we don't have the API endpoints, then how we can fetch it from the UI?

Ans: If it's a web application, then the Network tab under Developer tools will help to capture the endpoints.

54. Let's consider a scenario where the username and password is correct but we don't have access rights for any resources or  API which we are trying to access, then what should be the expected status?

Ans: Status code should be 403-Forbidden

55. How to Create a POJO class? How to convert Json to Pojo ?

Ans: Click Here For POJO

56. What do you mean by asynchronous Rest Clients?

Ans: Asynchronous clients don’t have to wait for a response to continue working. Therefore, microservices in an app can continue to process and send data, even when one of their partner services runs into issues. This capability provides more reliable service to the user and can be especially valuable in cases where service availability is low or overloaded with demand.

57. What is the use of JSON-RPC?

Ans:  JSON-RPC is a protocol similar to XML-RPC, it is a remote procedure calls (RPCs), and uses JSON instead of XML format to transfer data.  While calls may contain multiple parameters, it only expects one result.

58. How to automate POST-PUT-PATCH method in API Automation?

Ans: Click Here For Answer with Code

59. Name two commonly used architectural approaches while using APIs?

Ans: 

        - SOA-service-oriented architecture

        - Microservices architecture

60. Let's assume you have an endpoint /users/{user_id} , 

      and if we provide user id which is not present in database, 

      then which status code we expect from server?

Ans: Status Code should be 404 NOT FOUND, because the user id is not present in the database.

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Click Here For Steps with Screenshot

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61. How to Create API Testing positive and negative scenario's from the provided API endpoint?

Ans: Click Here For Test Scenarios On API Testing

62. Assume that you have a response body as below, if you want to fetch all the key and value of id=2 then what method you will use?

Ans: Click Here For Answer

63. If the request body for POST method is missing some mandatory field, then what will be the status code?

Ans:  400 bad request because when we send a post request all the mandatory field need to be present in request body.

64. How to Create Fake-API which can be used for Testing in Postman or Rest Assured? Very Useful for real-time practice

 Ans: Steps with Screenshot to Create API from Scratch - Click Here

65. What are most used API Status Codes?

200:  OK

201:  Created

204:  No Content

400:  Bad Request

401: Unauthorized

403: Forbidden

404: Not Found

302: Redirect

405: Method Not Allowed

422: Unprocessable Entity

417: Expectation failed

500: Internal Server Error

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Check below link for question and answers with code:

Top API Interview Question 1-10

Top API INterview Questions 11-20 

Top API AUTOMATION Interview Q&A - 21-30

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