Application Programming Interface or API is a computing interface that is described as a bridge that enables two different systems to communicate and exchange information. In our previous articles, you must have read about how important APIs are and why it is so crucial to test them thoroughly for proper performance.
Now, here we will be focusing on REST API, a highly important API that plays an important role in the interaction with RESTful web services. It might be more useful for tech businesses that have huge teams of engineers because if such a large number of engineers create multiple endpoints for every single product, it becomes a cumbersome task to manage everything. Anyways, let’s move on with the article to understand it better.
You already know how API testing is performed with the objective of determining the functionality, performance, dependability, and security of the APIs. In those tests, API calls are made using software instead of normal user inputs, and responses are recorded to check the correctness of the API’s performance. Now, let’s see how those strategies work for REST APIs.
REST API or RESTful API is an API that follows the limitations of Representational State Transfer or REST, and helps in maintaining a fast, flexible, and simple interaction between RESTful web applications. REST APIs are the most used API format as over 80% of public APIs are RESTful.
Though stateful REST APIs are said to be compatible with any protocol or data format, they mostly communicate through JSON, HTTP, XLT, XML, HTML, or simple text. Out of these data formats, JSON is preferred due to its compatibility with most languages.
Due to their adaptability, REST APIs are highly useful for complex services. Also, with their ability to process commands from multiple users and different data formats, REST APIs are widely used in various industries such as IoT or e-commerce.
REST API testing is a useful open-source automation technique that checks if the RESTful APIs are properly working for web apps. Though it is mostly used for testing JSON and XML-based web apps, it is compatible with all methods such as GET, POST, PUT, PATCH, and DELETE.
This test is performed by sending HTTP or HTTPS requests and recording the response of the REST API to check whether it is functioning properly or not. The above-mentioned methods i.e. GET, PUT, POST, PATCH, and DELETE are used in this form of testing.
Now, let’s check out some details about the four main types of API testing methods.
Based on the paths, you can perform REST API tests in the following two ways -
As the objective of these tests is to ensure that the REST APIs are working properly, the main procedure of doing that involves an interaction between an application and a sample API. The two primary requirements of API testing are mentioned below.
Tools used for REST API test cases are -
You will get to know about Advanced REST Client by the following portions in this article.
However, the good news for you is that Preflight lets you create and execute effective UI test cases that can eventually be extremely useful for testing different APIs used in your application. You can get every piece of information that you need from our website as well as our detailed documentation.
Follow the below-mentioned steps to get Advanced REST Client -
Now, as you have got Advanced REST Client, it’s time to test the RESTful API.
Here are the steps for the case of using the REST Client extension in Google Chrome. When the installation is done, proceed with the following steps for testing RESTful API -
Check The Authenticity of The Results
The goal of performing any form of test is to compare its obtained results with the expected results. And, in the case of web API testing, it is primarily determined by the API’s response code, response message, and response body. We have jotted down different response codes and their meanings.
GraphQL is a renowned application layer server-side technology and REST is a popular API that can be compared with it on multiple grounds. Hence, the below-mentioned detailed comparison between them can acknowledge you a lot.
The challenges that you may face in REST API testing are kind of similar to the ones that you may face in generic API testing. So, take a look at them carefully.
From the article, you can clearly see that REST API testing is an extremely useful practice that helps you ensure that your REST APIs are working properly. Here we have jotted down a compact and useful portion of everything you need to know about this crucial form of API testing. Hence, you must consider going through this article carefully to acknowledge yourself with a lot of information.
While this article can significantly help you decide how you should proceed with your REST API tests, you must know that using advanced test automation tools like Preflight is the step you need to take first for achieving great test efficiency as well as test coverage. It is a supremely powerful yet simple tool that can let you solve all your test automation needs within seconds without demanding you to be skilled in coding. And, you can be a part of our amazing community by just signing up with us.
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