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What is API Testing? API Testing Tutorial Guide for Beginners


API or Application Programming interface testing can be a standout amongst the most demanding parts of programming and QA testing as they are frequently found on conventions and norms that we regularly do not experience in other different kinds of testing. While engineers will in general test just the fundamental usefulness, they take a shot at, the analyzers who are responsible for testing the usefulness, the execution and the security of APIs, and finding how all the segments cooperate from start to finish. If you are a beginner in testing and looking to explore this field, consider going for a professional QA Software Testing Certification.

What Is API Testing?

An Application Programming Interface (API) at its center is a formal determination that goes about as an ensured contract between two separate bits of programming Present day PC frameworks are commonly planned to utilize the 'layered design approach”

What Is API Testing?

This implies the center usefulness of the framework is contained inside the "business rationale" layer as a progression of discrete yet associated business parts. They are in charge of taking data from the different (UIs), performing computations and exchanges on the database layer and afterward displaying the outcomes back to the UI.

Notwithstanding, notwithstanding speaking with individuals by means of the UI layer, PCs frameworks must almost certainly discuss straightforwardly with one another. For instance, your versatile ride-sharing application should speak with the mapping administration, the traffic and climate administrations and other specific applications utilized by the drivers giving the rides. In the cutting edge, interconnected world, we underestimate that all these distinctive frameworks can address each other flawlessly, as a general rule that would not be conceivable without APIs.

Before we move to the next section and explore the types of API testing if you want to get in-depth knowledge of the QA field, consider joining a QA Testing Certification Course from a professional institute like JanBask Training.

API Testing Types

There are many different ways of API testing that can be undertaken. Some of them are mentioned below:

Different Types of API Testing

  • Integration Testing - ensures that any new changes or increments to the API don't cause issues or bugs in different modules anyplace else in the framework
  • Load Testing - guarantees the production setup is equipped for taking care of the expected normal number of synchronous clients getting to the framework.
  • Regression Testing - decides if any new changes cause negative impacts in already effective tests for existing usefulness.
  • Security Testing - endeavors to abuse potential vulnerabilities in a framework or the fundamental structure.
  • User Interface Testing - ensures each part of the UI capacities obviously. Each experiment conceivable is then endeavored to utilize the GUI to guarantee it is effective.
  • Functional Testing - takes the framework prerequisites and client case situation and examines each utilization case to make certain the framework is fit for taking care of every single vital situation.
  • Stress Testing - is similar to Load testing in the sense that it might take regular cases and run numerous concurrent instances of the case in the meantime. Stress testing makes the test one stride more remote than Load testing since it keeps on pushing extra synchronous clients through the framework until the framework achieves a failure / disappointment point. Stress tests can be performed on both a framework wide dimension just as on quite certain parts of a framework.

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There are additional tests that are present and utilized for API Testing purposes but the most common tests on APIs that are performed are Load Testing and Stress Testing and they are industry-wide standard tests that are the most commonly done.

We recommend you to go through various QA-related blogs and training courses available on the JanBask Training that will help you increase your knowledge and answer your queries related to Testing.

Advantages Of API Testing

Upon comparison between  Graphical User Interface (GUI) testing and Application Programming Interface (API) testing, it gives a few key focal points, every one of which can improve the inclusion of your test cycle, monitor assets, and result in quicker, increasingly effective discharges. In light of your undertaking course of events, mix prerequisites, and wanted usefulness, API testing is typically an advantageous methodology when testing your application in-house or with a seaward QA group. Four key favorable circumstances of API testing include:

Advantages of API Testing

A). Core Functionality Test

The primary real preferred standpoint of API testing is access to the application without a UI. Testing the center, code-level usefulness of the application gives an early assessment of its general form quality before running GUI tests. This helps uncover the little mistakes that can putrefy and increase issues amid GUI testing. Center access likewise empowers testing pair with advancement, cultivating correspondence and improved coordinated effort between the two groups. This is particularly favorable on the off chance that you are playing out your API testing with a seaward QA group.

B). Time Efficiency

Programming interface testing is far less tedious than utilitarian GUI testing. In GUI testing, website page components must be surveyed, which backs the testing procedure off monstrously. To get a thought of the measure of time APIs can spare when testing the center usefulness of your application, think about the accompanying genuine precedent:

  • 3,000 API tests in 50 minutes (in parallel execution)
  • 3,000 GUI tests in 30 hours (in parallel execution)

In spite of the fact that this measurement is a normal determined by our group of specialists, you can anticipate practically identical time reserve funds on the off chance that you utilize an API for a comparative test schedule. Programming interface test mechanization requires less code and in this manner gives better, quicker test inclusion than computerized GUI tests. The final product of quicker testing is a diminished generally speaking testing cost.

C). Independent Of Language

In an API test, information is traded utilizing XML or JSON. These exchange modes are totally language-autonomous, enabling you to choose any center language while seeking after mechanized testing administrations for your application.

D). Simple Integration And Seamless Incorporation With Gui

With API testing, exceptionally integrable tests are conceivable. This is particularly useful on the off chance that you intend to perform practical GUI tests following your API testing. For instance, simple reconciliation would take into consideration the making of new clients inside the application before the beginning of a GUI test.

QA Quiz

So, we learned about the advantages of API testing. Before we move further, check how much you know about software testing with this free QA Testing Quiz.

What Exactly Needs To Be Verified In Api Testing?

The parameters that need to be tested and verified in API Testing are:

  • Input Parameters
  • Expected Resulting Outputs
  • Maximum Time to receive a Response
  • Parsing Inputs
  • Error Handling
  • Proper Response Formatting

Each test parameter ought to be incorporated into a testing content and pursue effectively each new form of the code. Ideally, each test ought to likewise be booked as a major aspect of a load test or a stress test to check that the API can deal with a concurrent load of every single diverse sort of tests immediately without issue.

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Tools Used For API Testing

I will give a rundown of the top API testing software and tools covering both open-source and business arrangements that testing groups can choose to suit their requirements.

Tools Used For API Testing

1). Soap UI

SoapUI is a headless useful testing device committed to API testing, enabling clients to test REST and SOAP APIs and Web Services effectively. Using the free bundle of SOAPUI, clients can get the full source code and construct their favored highlights.

2). Katalon Studio

Katalon Studio is a free test robotization device for API, Web, and Mobile applications. It is rising as the main device for API/Web administrations testing and situating itself as a thorough start to finish mechanization answer for the two designers and analyzers. Katalon Studio underpins both SOAP and REST demands with different sorts of directions and parameterization functionalities. Additionally, the ability to join UI and API/Web administrations for various situations (Windows, Mac OS, and Linux) has been viewed as a remarkable preferred standpoint of Katalon Studio among the top API apparatuses.

3). Postman

Being initially a Chrome program module, Postman presently expands their answer with the local form for both Mac and Windows. Postman is a decent decision for API testing for the individuals who would prefer not to manage to code in an incorporated improvement condition utilizing a similar language as the engineers.

4). Tricentis Tosca

Tricentis Tosca is a ceaseless testing stage for Agile and DevOps. Advantages of Tricentis Tosca incorporates underpins for many cluster of conventions like HTTP(s) JMS, AMQP, Rabbit MQ, TIBCO EMS, SOAP, REST, IBM MQ, NET TCP. It likewise incorporates into the Agile and DevOps Cycle. Besides it augments reuse and practicality with model-based test robotization and as an or more point API tests can be utilized crosswise.

5). Apigee

Apigee is a cross-cloud API testing instrument, enabling clients to gauge and test API execution, supports and manufacture API utilizing different editors like Swagger. It is multi-step and fueled by Javascript and permits the structure screen, sends, and scale APIs

Tools Used For API Testing

Check out these Top 10 Automation Testing Tools of 2022 that can actually simplify your testing process and help you make a mark in the QA domain

Challenges In API Testing

Testing groups face a few special difficulties when testing Application Programming Interface (API) usage. Programming interface testing is a piece of the combinations testing procedure and concerns the correspondence between two frameworks. Some of the challenges faced during the API Testing process are:

Challenges In API Testing

1). Beginning Setup Of API Testing

Manual testing affirms in the case of something works. Mechanized testing is vital with APIs to measure how well they perform under strain. Getting the testing foundation fully operational is frequently a standout amongst the most testing pieces of the process– not on the grounds that it is especially troublesome, but since it very well may be a considerable inspiration executioner. When you figure out how to inspire your group to overcome the procedure, in any case, it satisfies over the long haul.

2). Refreshing The Schema Of API Testing

The schema– at the end of the day, the information organizing that handles solicitations and reactions for the API– should be kept up all through the testing procedure. Any updates to the program that make extra parameters for the API calls should be reflected in the construction set up.

3). Testing Parameter Combinations

APIs handle correspondence between frameworks by relegating information esteems to parameters and going those parameters through information demands. It's important to test all conceivable parameter demand blends in the API to test for issues relating to explicit setups. A bigger venture could finish up doling out two distinct qualities to a similar parameter, or make occasions where numerical qualities show up when content qualities ought to be. Including an extra parameter exponentially expands the number of conceivable blends.

4). Sequencing The API Calls

Much of the time, API calls need to show up in a particular request to perform efficiently. This then becomes a sequencing challenge for the testing group. This procedure can get progressively troublesome when working with various applications.

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API Testing Best Practices

Here are 4 of the prescribed procedures that are available to make your testing procedure speedier, smoother and progressively cooperative.

API Testing Best Practices

1). Dry (Don't Rehash Yourself)

Make a customer for your SUT (System Under Test) before including tests.

You need to abstain from rehashing your code, however, numerous tests expect you to address similar segments or address comparative activities. In these cases, you can make a lodge library to wrap your test demands by making the utilization shorter and progressively straightforward all the while.

2). Lucidity

Compose clear tests that effectively empower investigating.

While tests are running effectively they require no consideration or time. At the point when tests begin coming up short, assets should be assigned to discover the reason for disappointment. This procedure might be very tedious amid the item advancement and go similar to pushing due dates or cutting new highlights from your item.

3). Mapping And Execution

Structure the tests to keep running under various SUT arrangement alternatives.

This test ought to be structured with the goal that you are not constrained by the framework. They ought to be configurable to keep running in any of your workplaces under various arrangements and give an unmistakable picture to every one of them with a split report.

The more adaptable the tests are, the less exertion is required when they are rendition part, in light of various client demands or when there is a noteworthy change in the item conduct under various designs/conditions.

4). Requirements And Cleanup

To concentrate on the segments right now under test, split the test into three areas:

 Requirements And Cleanup

  • Plan (Setup): The Setup makes every one of the conditions and assets required for testing the segment under test. Disappointments in setup ought not to demonstrate the test as bombed but rather as "Not Executed" in light of the fact that that implies that the disappointment we experienced is in an alternate part and not the segment presently under test.
  • Execution (Test): Execute the test that utilizes/depends on the readied segments. Also, confirm/attest the result coordinates the normal outcome
  • CleanUp (Teardown): Teardown is the post-test arrange in which we erase or reset framework assets that were made or altered as a major aspect of the test.


Application Programming interface (API) testing is a novel type of programming testing and especially important for the organizations that embrace a constant incorporation, integration and reconciliation process. Building API tests amid advancement of any product or administration has broad advantages crosswise over groups, right down to how your client encounters the products and their reaction to it. Making product software that your intended interest group will love is fundamental to the accomplishment of your business and by having your APIs tried thoroughly, you will guarantee a solid method for accomplishing it. Don’t wait anymore, be ready to jumpstart your QA career by enrolling yourself in a comprehensive Online QA Training, today!

Frequently Asked Questions 

Q1. What is API testing?

Ans: In order to determine whether an application programme interface (API) satisfies the requirements for functionality, security, performance, and reliability, API testing examines the API. Either on the API directly or as a component of integration testing, the tests are run.

Q2. Why is API testing crucial?

Ans: API testing is crucial to verifying that your API works as intended under a wide range of anticipated and unforeseen queries. This procedure is intended to verify the API's dependability, performance, and security in addition to its functionality.

Q3: What advantages do software testing offer?

Ans: The following are some advantages of software testing:

  • Budget-friendly
  • Safety
  • Client contentment

Q4. Is there a demand for API testing?

Ans: Growing demand for API testing has been made possible by an upsurge in technological developments in software development technologies. The demand for API testing has increased as a result of the information technology industries' increasing complexity.

Q5. What is the goal of the course on QA testing?

Ans: The main goal of our QA testing course is to offer an online QA certification programme that offers experiences similar to those found in traditional classroom settings. This eliminates the need for students to travel to physical classes, saves them money, time, and energy, and gives them a thorough grounding in the QA Testing discipline by covering the concepts, skills, and techniques required for QA tester certification and job roles.

Q6. What skills will I learn in this course?

Ans: The following is everything you will learn:

  • Manual testing, database testing, and software testing
  • Java and Oops (Basics of programming)
  • Selenium Web and IDE drivers
  • TestNG with Selenium WebElements
  • Cucumber and the Page Object Model
  • Continuous integration with Jenkins and Maven.

Q7. What can I anticipate after completing this course?

Ans: After finishing our online training for QA software testing, you will have the skills and knowledge necessary to succeed on the QA Testing certification exam. Additionally, you will acquire shrewd and determined ways to move forward and absorb in the profitable employment markets.

Q8. Which QA certificates are sought after?

Ans: After completing our thorough and industry-based training for QA Tester, you may want to pursue qualifying for a handful of these in-demand QA Testing Certifications:

I) Certified Associate In Software Testing (CAST)

ii) Foundation Level Certification for the ISTQB

iii) HP Certification

iv) Advanced Level ISTQB Certification

v) Exam for Advanced Level Test Manager

vi) ISTQB Expert Level Exam

Q9. What will the future of QA testers entail?

Ans: QA testing is one of the skills that are in high demand worldwide.

Software testers have a wide range of completely flexible career paths that they can modify as needed. If they have a good understanding of the various businesses, they can advance to become Project Managers or Business Analysts. Due to their methods of operation, QA Testers occasionally advance to become DevOps. The need for QA testers is not just present in the IT industry; it is also present in other industries such as healthcare, banking, transportation, and entertainment.

Q10. What types of jobs can I anticipate having after this course?

Ans: Upon successful completion of this course, you may pursue any of the following careers:

  • QA software tester
  • QA Analyst
  • QA Engineer
  • Business Analyst
  • Enterprise Architect 
  • Product Manager

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    With fact-finding market research & solicitous words, Nandita helps our digital learners globally navigate their way to profound career possibilities in IT and Management.


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