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11 API Testing Interview Questions and Solutions


API testing is an important a part of software program growth that entails testing an API’s performance, reliability, efficiency, and safety. And since so many net functions which might be in use immediately depend upon a minimum of one API, API testers are in excessive demand.

In case you have an API testing interview arising, among the best methods you possibly can put together is to assessment questions that you simply could be requested throughout your interview. You’ll be able to observe answering these questions by yourself or take into account doing a mock interview with a pal. For those who can arrange a mock interview, attempt to recreate an identical atmosphere to the one you’ll be in throughout your actual interview. For instance, in the event you’ll be interviewing over Zoom, do the mock interview over Zoom in order that your observe is as near the actual factor as doable.

That can assist you put together for API testing interview questions, listed here are among the most typical questions you’re more likely to face and recommendations on the best way to reply them.

1. What does API imply?

Throughout your technical interview, the interviewer might begin issues off with questions that appear straightforward. An ice-breaker query will be a chance so that you can shake off some nerves whereas additionally answering the query with particulars that will catch the interviewer’s consideration. This could be a current milestone you hit or a enjoyable venture you’re engaged on.

For this query, it is best to reply by first defining the acronym API, which is Software Programming Interface, after which you possibly can define what this implies. Particularly, it is best to point out that an API is a set of capabilities and procedures that enables a program to entry options or information from one other piece of software program or service. Because of this, it allows a number of functions to work together with one another.

2. What’s API testing?

That is one other ice-breaker query, and it offers you an opportunity to point out that you already know among the “why” behind API testing. You need to focus on how an API check checks to see if the perform being referred to as is behaving as anticipated. Throughout an API check, a perform is examined in opposition to a variety of inputs to see if it returns the anticipated worth from every check. Edge instances and nook instances are included within the check to make sure that the perform can deal with excessive instances. API testing is usually finished on the finish of growth to verify and see if the software program is performing as anticipated.

3. What are among the most typical protocols used throughout API testing?

This can be a easy query, and getting it proper reveals you perceive the API testing atmosphere on a better degree. In your reply, it is best to point out REST, SOAP, HTTP, UDDI, and JMS.

4. What are the most typical sorts of API testing?

Whereas there are numerous alternative ways of utilizing API testing, the everyday strategies are:

  • Perform testing, a check used to check the API’s performance in opposition to practical necessities.
  • Load testing, a check to emulate anticipated load, equivalent to site visitors, in a gradual stream that may decide points that will come up from working an API for a chronic time period.
  • Unit testing, which verifies whether or not particular person components of the supply code behave and work as anticipated.
  • Consumer interface testing, which assessments the features of an API {that a} consumer will work together with.
  • Safety testing, a collection of assessments that check the safety of the API. Entry factors, circulation of knowledge, and shadow APIs are all areas that ought to be examined throughout safety testing.
  • Penetration testing (or pen check or moral hacking), a sort of safety testing that simulates a cyber assault in opposition to your API to uncover vulnerabilities.
  • Fuzz testing, a check that sends random information to all of the endpoints of the APIs. Throughout fuzz testing, servers shouldn’t crash or show any odd conduct.
  • Runtime and error detection is used throughout all of those assessments and allows APIs to report any points that happen whereas it’s on.

When answering this query, you would deal with the assessments which might be utilized by the corporate to point out your particular data in that space.

5. Describe a typical API testing atmosphere

That is your likelihood to point out you already know the distinction between API and different kinds of software program testing. When testing an API, you first need to configure the database and server to make sure the API will be put in. After putting in it, you possibly can then begin verifying its right perform. Because the check continues, you consider the atmosphere utilizing API calls and analyze the outcomes to see if it’s working because it ought to.

Right here’s an instance of a testing atmosphere that you would be able to give when answering this query: You should utilize Postman to check APIs. Postman lets you make HTTP requests to an API and look at the responses you get formatted in JSON.

6. Which architectural kinds are used to create net APIs?

It’s possible you’ll be requested this query as a result of the kind of architectural type used to create an API can inform the API testing protocol. The extra frequent architectural kinds are:

  • REST API Fashion
  • GraphQL API Fashion
  • RPC API Fashion
  • SOAP API Fashion
  • gRPC API Fashion
  • Falcor API Fashion

7. What does SOAP imply?

That is nearly assured to return up throughout your interview. SOAP is an acronym for Easy Object Entry Protocol. This can be a messaging protocol primarily based on XML, and it makes it simpler for computer systems to speak with one another.

8. What’s a REST API?

That is one other query that’s more likely to be requested. In reality, it’s exhausting to think about an API testing interview with out it.

A REST API (also referred to as RESTful API) is an API that meets the constraints of REST architectural type, which is a set of architectural constraints for offering requirements between pc methods on the internet. These constraints make it simpler for methods to speak with one another. REST is an acronym for REpresentational State Switch.

9. What are some variations between REST and SOAP?

As a result of SOAP and REST can accomplish the identical goals, there’s a excessive likelihood that this query will pop up. Right here’s a primary breakdown of the variations between REST and SOAP:

  • SOAP is a protocol computer systems use to share XML paperwork, whereas REST is a design and repair structure used to arrange software program environments on a community.
  • SOAP strictly helps XML, whereas REST helps a number of information codecs.
  • SOAP doesn’t assist caching, whereas REST does.
  • SOAP is slower.
  • SOAP is sort of a regular pc app, whereas a REST consumer is extra like a browser that enables apps to run inside it.
  • SOAP envelops a message whereas working on HTTP, whereas REST makes use of HTTP headers to carry its metadata.

10. What are among the most typical API assessments carried out?

This query has a number of good solutions, and your reply will doubtless depend upon the assessments you might have probably the most expertise with.

For instance, you possibly can focus on how an API is examined to see the way it handles an HTTP (GET, POST, or different) request. With this check, you’re evaluating if the variables despatched with the HTTP request had been processed correctly. This check additionally seems to be to see if there’s a request error (40X error), and in that case, what’s it and why is it occurring? Then, if the request is profitable, did the API reply with the anticipated values correctly formatted? An API check may even see if it’s speaking with the correct endpoint.

11. What are among the advantages of API testing?

That is one other likelihood to dig into the “why” of API testing. In your reply, you possibly can spotlight how API testing can save time as a result of it might require much less code than graphical consumer interface (GUI) testing. You’ll be able to check APIs with no consumer interface, which means you don’t have to attend for an software to be obtainable. One other profit is that API testing is not restricted to a selected coding language. And API testing is an efficient option to cut back threat cost-effectively, particularly in the event you’re trying to find minor bugs.

Observe makes excellent

For those who want a refresher otherwise you’re on the lookout for extra publicity to APIs, we provide a number of ability paths and programs that target APIs and the architectures that use them.

You’ll be able to brush up in your foundational data of the API growth lifecycle in our API Improvement with Swagger and OpenAPI course, or you possibly can learn to construct an internet API with the Spring framework within the Create REST APIs with Spring and Java ability path. You would additionally take your abilities to the subsequent degree with our ​​Be taught Testing for Net Improvement course, the place you’ll dive into the best way to check functions on the mannequin and server ranges, together with assessments for dynamic HTML content material and different API responses.

For those who’re on the lookout for extra recommendation and assist on your upcoming interview, learn over our full information to the technical interview and our recommendation on answering behavioral interview questions. We even have suggestions for the whiteboard interview that you would be able to assessment earlier than your interview.

For those who’re seeking to be taught a brand new ability or develop in your current data, have a look by way of our full course catalog.


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