API Testing

API testing is a type of software testing that involves testing application programming interfaces (APIs) directly and as part of integration testing to determine if they meet expectations for functionality, reliability, performance, and security. Since APIs lack a GUI, API testing is performed at the message layer.

Q.1 Why API testing is required?
API testing enables the tester to secure requests that might not be allowed through the UI, which is essential for detecting potential security defects in an application. Because differences in software occur at such a speedy pace today, it's significant to have tests that give fast feedback for developers and testers.
Q.2 What are Web APIs applied for?
Web APIs are very helpful in implementation of RESTFUL web services utilizing .NET framework. Web API assists in facilitating the development of HTTP services to stand out to client things like devices, browser, or tablets. ASP.NET Web API can be practiced with MVC for any type of administration.
Q.3 What are the devices utilized for API testing?
SoapUI Pro PostMan Alertsite API monitoring
Q.4 Does API testing require coding?
The testing does not constitute the source code. The API testing program helps to thoroughly understand the functionalities, testing methods, input parameters and the performance of test cases. Complete the test cases and compare expected and real results.
Q.5 What do you understand by browser APIs?
Browser APIs are the APIs that evolve built-in with the browsers. They enable developers to implement complex operations without administering with the sophisticated lower-level code.
Q.6 How is restful API implemented?
The implementation consisted of running the code from the JUnit tests into the APIs and then refreshing the tests to summon those APIs. The modifyCertificate method, that gives the implementation for the certificates resource PUT method, was the most difficult REST API to implement.
Q.7 Tell us about the API methods.
The first or most-commonly-used HTTP methods are GET, POST, PUT, PATCH, and DELETE. There are a number of other verbs, too, but are utilized less frequently.
Q.8 What is API framework?
API frameworks are code institutions that contribute commonly-used functionality when establishing our own web (APIs) application programming interfaces.
Q.9 Is API a IoT?
The application program interface, or API, is arguably what really ties collectively the associated “things” of the “internet of things.” IoT APIs are the forces of communication between an IoT device and the internet and/or other elements within the network.
Q.10 Which type of communication API works in IoT?
REST is most popular IoT Communication APIs.
Q.11 What are the standard tests performed on API’s?
Affirmation of the API whether it is renewing any data structure Check if the API does not deliver anything Based on input circumstances, stated values from the API’s are marked Verification of the API whether it triggers some other event or calls another API
Q.12 Define SOAP.
SOAP-stands for Simple Object Access Control, and it is an XML based protocol for exchanging information between computers.
Q.13 Why SOAP is more reliable than REST?
SOAP is more reliable than REST as it practices WS-Security for transmission with Secure Socket Layer. Also, SOAP is state-full as it takes the whole request as a whole, unlike REST which gives independent processing of various methods. No independent processing is there in SOAP.
Q.14 What the principal measures to be taken in thought while writing API document ?
Source of the content Document design or sketch Delivery layout Information needed for each function in the document Automatic document creation programs
Q.15 What is Input injection and what are various ways of doing it ?
Direct Method Invocation Invocation utilizing an accessibility interface Simulation managing low-level input Simulation using a robot
Q.16 How API testing is performed?
API testing is performed by using various API testing tools during development and execution of API test cases. API testing requires configuration of test cases on API testing tools.
Q.17 What is API testing for beginners?
API testing for beginners involves getting to know basics of web technology, API basics and API testing tools like SoapUI.
Q.18 Is API testing easy?

Yes, API testing is easy if you are having good grasp of concepts of web technology and API basics. You can also learn and get certified on API testing tool like SOAPUI at link - https://www.vskills.in/certification/testing/soapui-testing-certification


Q.19 What is API testing in manual testing?

API testing in manual testing refers to testing of API manually instead of automation testing of API. Test cases are executed manually, results are stores and analysis is done manually.

Q.20 What is API used for?

API expands to Application Programming Interface, is an interface to connect, access and transfer data among different computing systems. It is needed so that different systems can interact and share data among them. For example data being shared among social media applications like Google and Facebook.

Q.21 What is API manual testing?
API manual testing is manual testing of API and not using automation testing for API tests. Test cases are developed and executed manually instead of relying on automation testing tools.
Q.22 Why API testing is needed?
API testing is needed to validate and verify the developed API against customer requirements in various aspects like functionality testing, UI testing, security testing performance testing etc. Unit and integration testing are also performed.
Q.23 What is REST API in testing?
REST API in testing is used to test REST API which is widely used in web applications especially web services being developed for new age companies like startups. REST expands to Representational State Transfer
Q.24 What are the different types of API?
The different types of API are - UDDI, SOAP, REST and XML-RPC
Q.25 What is an example of an API?
An example of an API - data being shared among social media applications like Google and Facebook.
Q.26 Can we automate API testing?
Yes, we can automate API testing by using automation testing tools for API testing.
Q.27 What is the best tool for API testing?
The best tool for API testing are many like soapui, postman, jmeter. It depends upon testing requirement for selection of appropriate tool for API testing.
Q.28 How does an API work?

API works by exposing methods and data which is accessible over various protocols or network like HTTP. Any one wants to access the data, uses the accessible methods to access the required data like weather data being provided by various government weather data providers.

Security is implemented by using symmetric or asymmetric encryption.

Q.29 What is a JSON API?
JSON API is an interface for exchange of data and functionality in JSON. JSON API expands to JavaScript Object Notation API.
Q.30 What is Agile methodology in testing?
Agile methodology in testing means testing as per Agile principles which involves continuous testing as per continuous development or delivery of software during software development life cycle. Testing and development takes place simultaneously.
Q.31 What is test case in manual testing?
Test case in manual testing refers to a group of actions done to verify a function or feature of software under test. An example test case in manual testing can be checking output by software when, invalid login details are given – error screen comes up. Test case will need details like username/password, etc and conditions for success and failure and henceforth, result.
Q.32 What is API in Java?
API in Java refers to Java API which are classes, interfaces part of JDK which is used for developing Java based applications.
Q.33 Can selenium be used for API testing?
Yes, selenium be used for API testing but supports web browser based automation testing hence, Selenium will need a API testing tool and will provide automation in API testing.
Q.34 Is API a software?
API is not a software but rather just an interface to provide data exchange and functionality among different software application or processes. As API provides access to data and functionality, it can be thought as a software which fulfills our need. For example authentication service provided by Google to different websites for one click login.
Q.35 What is an API gateway?
API gateway acts as an gateway or single point contact for various API based services. It optimizes requests for different APIs, it can route, optimize and provide a simple interface for data and functionality access instead of accessing multiple APIs like authentication service provided by Google to different websites for one click login
Q.36 Is RPC an API?
RPC is an API or similar to it as it provides interface to call procedure on remote machines or by remote machines.
Q.37 What exactly is an API?
API expands to Application Programming Interface, is an interface to connect, access and transfer data among different computing systems. It is needed so that different systems can interact and share data among them. For example data being shared amongst social media applications like Google and Facebook.
Q.38 How many API are there?
There are many APIs. Now, due to spread of smart phones and internet, web based services are the de-facto requirement of websites. Websites provide data and functionality by API and can connect and share data and functionality among various API providers.
Q.39 What is Uri in REST API?
Uri in REST API is the endpoint for access of data and functionality by REST API. URIL expands to Universal Resource Identifier.
Q.40 Can JMeter be used for API testing?
JMeter can be used for API testing especially REST API. JMeter is open source tool and used for performance or load testing.
Q.41 Is JMeter good for API testing?
Yes, JMeter is good for API testing especially REST API. JMeter is open source tool and used for performance or load testing.
Q.42 What is API performance testing?
API performance testing refers to testing of API for verification and validation of performance parameters as provided by customer. It usually includes load testing and functional testing.
Q.43 What is meant by API testing?
API testing refers to testing of API by conducting test cases. Test cases are developed and executed to test to validate and verify the developed API against customer requirements in various aspects like functionality testing, UI testing, security testing performance testing etc. Unit and integration testing are also performed.
Q.44 How do you do API testing?
API testing done by using various API testing tools during development and execution of API test cases. API testing requires configuration of test cases on API testing tools.
Q.45 Why is API needed?
API expands to Application Programming Interface, is an interface to connect, access and transfer data among different computing systems. It is needed so that different systems can interact and share data among them. For example data being shared among social media applications like Google and Facebook.
Q.46 What is API example?
API example is data being shared among social media applications like Google and Facebook. Another example is authentication service provided by Google to different websites for one click login.
Q.47 Is an API an application?
API is not a application but rather just an interface to provide data exchange and functionality among different software application or processes. As API provides access to data and functionality, it can be thought as a application which fulfills our need. For example authentication service provided by Google to different websites for one click login.
Q.48 What is API in layman terms?
API in layman terms is like a translator who makes two different language speaking persons interact – share data and functionality. Different persons are different software / process/ web services like data exchange between Facebook and Google.
Q.49 Is JSON a protocol?
No, JSON is not a protocol as it is data format for exchange over various protocols like HTTP. JSON expands to JavaScript Object Notation. JSON has two types of data stores - attribute–value pairs and array data types
Q.50 What is API and API testing?

API expands to Application Programming Interface, is an interface to connect, access and transfer data among different computing systems. It is needed so that different systems can interact and share data among them. For example data being shared amongst social media applications like Google and Facebook.

API testing refers to testing of API by conducting test cases. Test cases are developed and executed to test to validate and verify the developed API against customer requirements in various aspects like functionality testing, UI testing, security testing performance testing etc. Unit and integration testing are also performed.

Q.51 What is the use of SSL certificate?
SSL certificate is used for providing authenticity to the web service or website in HTTPS.
Q.52 Is JSON an API?
No, JSON is not a API as it is data format for exchange over various protocols like HTTP. JSON expands to JavaScript Object Notation. JSON has two types of data stores - attribute–value pairs and array data types
Q.53 Is there any certification for API testing?

Yes, agile testing certification is at link - https://www.vskills.in/certification/testing/api-testing-certification

 

Vskills offers following deliverables

-          Online video based, e-learning LMS

-          Hard copy to candidates residing in India

-          Practice tests for assessing your knowledge

-          Government certification

-          Vast alumni strength working in reputed software companies like Accenture, Cognizant, IBM, TCS, etc

Q.54 Is there any good link to practice my API testing skills?

Yes, link to practice API testing skills is at link - https://www.vskills.in/practice/api-testing-questions

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