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Table of contents
API Testing 
Benefits of API Testing
Tips for Performing API Testing
How to Conduct the Process of API Testing?
API testing with VS code
API testing with Net beans 
What is Net Beans?
Required Java Library
Frequently Asked Questions
What does API testing mean?
Which IDE is the fastest for Java?
Can we download NetBeans for free?
How do we run code tests in Visual Studio Code?
Last Updated: Mar 27, 2024

How to Perform API Testing in Various IDE?

Author Kanak Rana
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Hello Ninjas!! Do you know what an API is? So basically, an API(Application Programming Interface) helps to communicate two softwares using some protocols and a set of definitions. So it becomes essential to do API testing to ensure that API performs as expected. 

how to perform api testing

In this article, we go through various IDEs(Integrated Development Environments) and see how to perform API testing in various IDE. Let's have a look at API Testing first.

API Testing 

When developing a software application, API work as the middle layer between the presentation and database layers. API work is to communicate and exchange data from one system to another. On the other hand, API testing is a practice of software testing that checks functionality, performance, security, reliability, etc.

API testing

API testing, as part of integration testing(the 2nd level of the software testing process comes after unit testing), confirms the build architecture's logic in a short time. The process of validating by checking and approving the HTTP responses concerning requests sent to the server by or from the client is called API testing. Let us discuss the benefits of API testing.

Benefits of API Testing

The following are the benefits of API testing:

📌 Language-independent.

📌 GUI-independent.

📌 Faster releases.

📌Runtime and Error Detection.


📌UI/Visual Testing.

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Tips for Performing API Testing

These are some tips for performing API testing:

Tips for Performing API Testing

How to Conduct the Process of API Testing?

API testing flow is quite simple, with three main steps:

  1. Send the request with the necessary input data.
  2. Get the response having output data.
  3. Verify that the response returned as expected in the requirement.

We will see all these steps in the examples below:

API testing with VS code

For API testing in VS Code, we use the Thunder Client extension in VS code:

The following steps are there to use Thunder Client in VS code:

1️⃣ Open your visual studio code, search for thunder client, and install it.

Open Vs code

2️⃣ A thunder icon will be shown on the left side of the screen. Click on the icon to start working with the thunder client.

click on thunder Icon

3️⃣Initially, we can test it with a default endpoint, through which you can send a GET request. 

You will get a JSON response that provides basic information about the Thunder Client extension.

json response

4️⃣ We can take a random API and test it. To test, let us check ResponseCode, ResponseBody, ResponseTime, etc.

  • ResponseCode - HTTP response codes are three-digit codes generated by a server in response to a client's browser-side request. 
  • ResponseBody informs a controller that the returned object is automatically serialized into JSON and returned to the HttpResponse object.
  • ResponseTime- The time it takes to convey the inquiry, processes it by the computer, and convey the response back to the terminal.
Random API

5️⃣ The results of the above test cases are here in Results.

Check the response

API testing with Net beans 

Since we are going to work on NetBeans, let us first learn about some related terms like Junit, which is a testing framework, Gradle, and Netbeans.

What is Net Beans?

NetBeans is the integrated development environment for Java programming language. NetBeans runs on various platforms like macOS, Windows, Linux, and Solaris.


JUnit is one of the popular Java unit testing frameworks. It is an open-source framework used to write and run repeatable automated tests.


It is a build automation tool well known for its flexibility and ease of building software. It is similar to maven. This automation tool is used to automate the creation of various applications. 

Required Java Library

👉Since we will use an external Java library such as Junit, make sure to add dependencies in your build.gradle file.

add dependencies

dependencies {
     testImplementation group: '', name: 'rest-assured', version: '5.3.0'

Note - For the latest version, visit the maven repository.

👉 Make a java class in the Test package.

make a java class

👉Name it

name it test.api

Note - For the latest version, visit the maven repository

Now write the following code and run your gradle test run.

package com.package;
import org.junit.jupiter.api.Test;
import io.restassured.RestAssured;
import io.restassured.response.Response;
class TestAPI {
public void get_test(){
	Response response = RestAssured.get("");

👉 Now run the program

run the program
run the program

Output - Test Results

Output - Test Results

Output - Test

Output - Test

Frequently Asked Questions

What does API testing mean?

To ensure that an application program interface (API) meets the requirements for functionality, security, performance, and reliability, it is tested using a technique called API testing.

Which IDE is the fastest for Java?

One of the most popular IDEs for computer programming is Eclipse. NetBeans is a well-known open-source IDE for Java, and IntelliJ IDEA is a Java-based integrated development environment.

Can we download NetBeans for free?

NetBeans IDE is a free and open-source combined development environment to develop applications on the Windows, Mac, Linux, and Solaris operating systems.

How do we run code tests in Visual Studio Code?

Tests can be executed or run from Test Explorer by right-clicking a test in the code editor, selecting a Run test, or using Visual Studio's default Test Explorer shortcuts.


This article discusses how to perform API testing in various IDE. We have covered API testing in this article. We hope this article helps you enhance your knowledge of VS code and other IDE. We suggest you to check out our other articles to learn more about VS code.

We hope you have gained a better understanding of this topic now! Are you planning to ace the interviews with reputed product-based companies like AmazonGoogleMicrosoft, and more? Attempt our Online Mock Test Series on Coding Ninjas Studio now!

Happy Learning!!

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