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20 Questions and Answers About the API to Help You Do Well at the Interview

20 Questions and Answers About the API to Help You Do Well at the Interview

When looking for a job as an Application Programming Interface (API) software engineer, you might need to show that you know a lot about API, API testing, SOAP, and REST. As with any interview, you should plan your answers ahead of time to make sure you show that you have the skills and knowledge needed for the job. This is especially important if you’re trying to get a job in a technical field. Questions and Answers About the API

This article has a list of 20 API interview questions, explains why employers might ask them, and gives examples of answers to help you prepare for a good interview.

Examples of how to answer questions about the API

If you are applying for a job as an API software engineer, your interviewer may ask you a lot of technical questions. Here are some examples of how to answer 20 questions about API that a hiring manager might ask:

1.First of all, what’s an API?

This is a question an interviewer might ask to see if you know enough about the job to do well. At the very least, you should explain what API stands for. You can also give an example of when you’ve used it before to make your answer longer.

“An API is a piece of software that makes it possible for two programs to communicate with each other.”

2. How can a Web API be made in different ways?

This question can show how well you know how to work with API and how comfortable you are with it. If you want to really stand out from the other candidates, you might want to do more than just answer the question. Include your favorite style of architecture or a story about when you used that style.

Example: “Common Web API architectural styles include XML/JSON as a formatting language, stateless communication, basic URI as the address for the services, and HTTP for communication between the client and the server. XML is better than JSON for me.”

3.What does it mean to test an API?

If an interviewer asks you this question, it could be because they want to see if you can put basic ideas into practice. Explain what you mean by giving a clear definition and some examples. You could also talk about how important these tests are.

“API testing is a type of software testing that checks to see if the APIs that have been made work, are safe, and are reliable.” Validation, security, user interface, functional, load, penetration, runtime/error detection, fuzz, interoperability, and WS Compliance are all common types of API testing.

4. Why is it important to test APIs?

You can show that you’ve given your role careful thought by listing the benefits. Make sure your answer shows that you know what API testing is and what it can do for you. You should show the interviewer that you understand how and when to use it in your work.

Example: “API testing lets you use an application without a user interface. This lets you find small problems during GUI testing before they become big ones. Also, testing APIs usually takes less time than testing GUIs because they have less code. Because of this, the test coverage is better and more complete.

The data is sent using XML or JSON, which is another benefit. Users can choose any automation testing service they want because these ways of sharing information can be used with any programming language. Also, API testing and GUI testing are easy to put together.”

5. What steps do you take to test an API?

Show the person interviewing you how you would test an API. This can show how well you can do everything. Write down each step and take your time.

Example: “When testing APIs, you choose the suite where you want to add the API case you want to test, and then you choose the test development mode. After that, you make test cases for the API methods you want to test and set up the control parameters, test conditions, and validation method for the application. The API test can then be done. Once the test is done, you look at the test reports, sort and filter all of the API test cases, and then run the test again.

6.What is the hardest thing about testing APIs?

You can say yes, but be honest about what parts of API testing are hardest for you. Try not to think too much about things that went wrong or were hard. Your answer can also show how well you understand the software.

Example: “Choosing parameters, putting them together, and putting calls in the right order are the hardest parts of API testing for me.”

7.What are some tools used to test APIs?

Even though they ask for a list of tools, what they really want is your opinion about them. Be sure to say what you think when you answer. This can show that you know what makes good API testing.

Katalon Studio, Postman, SoapUi Pro, Tricentis Tosca, and Apigee are some of the most used tools. I like the way SoapUi looks better. It’s quick and easy to use.”

8. When testing an API, what kinds of bugs are most often found?

Use this answer to show that you know more about API than how it works. A potential employer might value your experience with this software just as much as the technical training you got. Try to think of specific times when you ran into bugs and how you fixed them.

Example: “I have often used API testing to find a wide range of problems, such as missing or duplicate functionality, failure to handle errors effectively and smoothly, and any performance, stress, multi-threading, reliability, or security problems. On the other hand, API testing has found errors like errors that were not implemented correctly, flags that were not used, and errors that were handled in different ways.

9.What makes Web services different from API?

API and Web services do different things. You can show that you know when to use each one with your answer. Think about writing down what each word means and how it is different from the other.

“Web services must be on the web and be able to communicate with each other in three ways: SOAP, REST, and XML-RPC.” They always need a network to work. But APIs can talk to each other in more than one way. They don’t need to be connected to a network or the Internet to work.

10.What is it? 10.

This is another question an interviewer might ask to see if you know enough about the business. Explain what “SOAP” means in your answer. You could also explain why you want to use it.

Example: “SOAP, which stands for Simple Object Access Protocol, is a messaging protocol based on XML. It lets computers share information and talk to each other. You can add, find, delete, or change records using SOAP API. When there are more than 20 different calls, SOAP API can help with searches and password management. It does this by making the protocol work with any language that supports web services.

11.What does REST API mean?

An interviewer might ask you about the different kinds of API to see how well you know them. Make sure to include what REST stands for and why you’re using it. This shows that you’ve given everything some thought.

“REST,” which stands for “Representational State Transfer,” is a set of functions that help developers send requests and get answers. You can talk to each other using HTTP Protocol. Since REST doesn’t have state, the server doesn’t have any information about sessions or states. If you use the REST API right, you can restart the server between calls. The POST method is used to do most things with Web services. In REST, GET is used to get to resources.”

12. What’s different about SOAP and REST?

Part of being able to think critically is being able to compare two similar ideas. If you can give a good answer to this question, it can show that you can think about more than one thing at once. When trying to figure out what’s wrong, this is very helpful.

“SOAP and REST are different in a number of ways. First, SOAP is a set of rules that lets two computers share XML and talk to each other. REST, on the other hand, is a service for network-based software architecture. Also, SOAP only works with XML format, while REST works with many different formats. Caching doesn’t work with SOAP, but it does with REST.

13. What factors help you decide whether to use Web services that use the SOAP or REST style?

With this question, you can show how qualified you are and how well you know API. Describe a time when this choice was especially hard or important, if you can. In your answer, you can say what you really think based on evidence.

“REST is usually better because it is easy to use, quick, scalable, and can work with many different data formats. But SOAP is a good choice for a service that needs to be very safe and reliable.

14. What tests for APIs can help?

Before giving your answer, you should answer the question to show that you know and understand API. This can show the person doing the interview that you understand why tests are given. This shows that you give your work decisions a lot of thought.

“Tests can and should help with APIs for a number of reasons, such as testing the return values or the conditions for entering data.”

15. In what kind of environment should API be tested?

Show who you are when you answer this question. It’s hard to set up a place for testing. You can say what you think to show how well you understand how things work.

“It can be hard to set up an API testing environment because you can’t use a graphical user interface to set up both the server and the database.”

16. What’s the difference between testing the user interface (UI) and testing the application programming interface (API)?

This question sees if you know how to test software in different ways. It also shows that you know how and when to use each one. Before you answer, think about what’s different.

“UI testing,” which stands for “user interface testing,” looks at how the parts of an app’s graphical interface can be used by the user. On the other hand, API testing makes it possible for two software systems to talk to each other and share functions and subroutines.

17What does it mean to “inject an input”?

Since this is a basic part of API, keep your answer short. Someone who gives a long answer might not fully understand the process or not know what to do. Make sure your answer is clear by planning it ahead of time.

“Input injection” is the act of pretending to be a user and doing what they would do.

18. What are some ways to make it look like a user is typing?

There are many ways to use input injection, but just give your interviewer a few examples. They know everything they need to. They want you to be successful too.

“Input injection can be done in a number of ways, such as with a robot, a device driver, or low-level input.”

What’s Runscope? 19.

Interviewers could ask you a wide range of questions about API. Make sure to describe the application. You can also use what the API gives you to test it.

“Runscope is a Web app used to test APIs. It has an easy-to-use interface and back-end services.”

20. Explain API documentation

Documentation is very important when testing an API. Make sure that as you describe the process, you explain why it is important. This shows that you can do everything that needs to be done.

Example: “Good API documentation is very important. It’s a quick way to look something up in a program while you’re working on it. It shows the plan, how the content will be delivered, where it will come from, and what each part of the system does.

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