Name: API Testing Interview Questions [Updated 2021] | Software Testing Material
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API Testing Interview Questions [Updated 2021] | Software Testing Material

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Skip to contentAPIs are a critical part of the modern web, as they allow developers to share data across different platforms.As a software tester, you may have been asked to test an API. If so, you’ll want to know the best way to approach this task from both a technical and non-technical standpoint. In order to do so, it’s important that you have a strong understanding of what APIs are and how they work.In this blog post, we’ll be going over some of the most frequently asked Web API testing interview questions and answers. We will discuss what they are and how to answer them as well as provide a list of other related topics that you should know.Before going ahead, let’s see some unavoidable Interview Questions&nbsp;which every hiring manager asks you in any Software Testing interview.Let’s move with the actual post on API Interview Questions And Answers.Before going ahead, I would like to let you know that we have another post where we covered 30+ Postman Interview Questions separately.API is an acronym and it stands for Application Programming Interface. API is a set of routines, protocols, and tools for building Software Applications. APIs specify how one software program should interact with other software programs.In simple words, API stands for Application Programming Interface. API acts as an interface between two software applications and allows the two software applications to communicate with each other. API is a collection of software functions that can be executed by another software program.API testing is a type of software testing that involves testing APIs directly and also as a part of integration testing to check whether the API meets expectations in terms of functionality, reliability, performance, and security of an application. In API Testing our main focus will be on the Business logic layer of the software architecture.&nbsp;API testing can be performed on any software system which contains multiple APIs.API testing typically involves the following practices:Learn more on API Testing TypesSome of the protocols using in API Testing are as follows:Some of the architectural styles for creating web api are as follows.In API testing environment, no GUI (Graphical User Interface) is available.For API, the test environment is a rather sophisticated approach that configures the server and database to match the requirement of the software application. After the installation process is done, API will be verified for correct functioning.Throughout the process, various parameters for the original environment are established via API calls to examine the test results.Web services:1. All web services are APIs2. All web services need to be exposed over web(HTTP)3. A Web service uses only three styles of use: SOAP, REST and XML-RPC for communication4. A Web service always needs a network to operateAPIs:1. All APIs are not web services2. All APIs need not be exposed over web(i.e. HTTP)3. API uses multiple ways for communication e.g. DLL files in C/C++, Jar files/ RMI in java, Interrupts in Linux kernel API etc.4. APIs don’t need a network for operationSOAP stands for Simple Object Access Protocol. It is an XML based messaging protocol. It helps in exchanging information among computers.REST stands for Representational State Transfer. It is a set of functions helping developers in performing requests and receive responses. Interaction is made through HTTP Protocol in REST API.SOAP:1. SOAP is a protocol through which two computers communicate by sharing XML document2. SOAP supports only XML format3. SOAP does not support caching4. SOAP is slower than REST5. SOAP is like a custom desktop application, closely connected to the server6. SOAP runs on HTTP but envelopes the messageREST:1. REST is a service architecture and design for network-based software architecture2. REST supports different data formats3. REST supports caching4. REST is faster than SOAP5. REST client is just like a browser and uses standard methods An application has to fit inside it6. REST uses the HTTP headers to hold meta informationSome of the common tests we perform on APIs are as follows.1. Verify whether the return value is based on the input condition. The response of the APIs should be verified based on the request.2. Verify whether the system is authenticating the outcome when the API is updating any data structure3. Verify whether the API triggers some other event or request another API4. Verify the behavior of the API when there is no return valueBasically, on API Testing, we send a request to the API with the known data and we analyze the response.1. Data accuracy2. HTTP status codes3. Response time4. Error codes in case API return any errors5. Authorization checks6. Non-functional testing such as performance testing, security testingSome of the tools used for API Testing are as follows:Learn more on&nbsp;API Testing ToolsSome of the API documentation templates are as follows.Some of the popular API examples areUNIT TESTING:API TESTING:Some of the challenges we face while doing API testing are as followsIssues observed when performing API testing areUI (User Interface) testing is to test the graphical interface part of the application. Its main focus is to test the look and feel of an application. On the other hand, API testing enables the communication between two different software systems. Its main focus is in the business layer of the application.Some of the HTTP methods areGET: It enables you to retrieve data from a serverPOST: It enables you to add data to an existing file or resource in a serverPUT: It lets you replace an existing file or resource in a serverDELETE: It lets you delete data from a serverPATCH: It is used to apply partial modifications to a resourceOPTIONS: It is used to describe the communication options for the target resourceHEAD: It asks for a response identical to that of a GET request, but without the response bodyNo, GET request only allows read only rights. It enables you to retrieve data from a server but not create a resource. PUT or POST methods should be used to create a resource.PUT and POST methods are sometimes confused in regards to when each should be used. Using POST request, our intent is to create a new object on the server whereas with PUT request, our intent is to replace an object by another object.POST should be used when the client sends the page to the server and then the server lets the client know where it put it. PUT should be used when the client specifies the location of the pageDon’t Miss:I would like to conclude this post “API Testing Interview Questions” here.&nbsp;Final words, Bookmark this post “API Interview Questions And Answers” for future reference.Here I have hand-picked a few posts which will help you to learn more interview related stuff:What are your opinions about this post “API Testing Interview Questions”? Was this post helpful? Do comment.&nbsp;If you find this post useful, do share it with your friends on Social Networking.Thank you Rajkumar, for sharing such a helpful article.ReplyThanks Raj a helpful article for Fresher &amp; Experience people also.Reply

Skip to contentAPIs are a critical part of the modern web, as they allow developers to share data across different platforms.As a software tester, you may have been asked to test an API. If so, you’ll want to know the best way to approach this task from both a technical and non-technical standpoint. In order to do so, it’s important that you have a strong understanding of what APIs are and how they work.In this blog post, we’ll be going over some of the most frequently asked Web API testing interview questions and answers. We will discuss what they are and how to answer them as well as...

API Testing Interview Questions [Updated 2021] | Software Testing Material

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