Software development

10 API Testing Tips for Beginners SOAP & REST

Testing before deployment usually means unit testing, and testing either the underlying business logic of a REST API as well as the API service itself. Both testing before and after deployment are critical to ensure a high quality API. So API testing is designed to validate the business logic as well as the performance, security, and other aspects of the application. As an example, Apache JMeter is a free, open source Java application that works on Windows, Linux or macOS.

REST API Testing

You may see people refer to them as RESTful APIs or RESTful web services. It can also be used to send data to the server, for example, customer information, file upload, etc. using HTML forms. It supports all types of api testing best practices REST, SOAP requests, and SSL client certificates. A REST API acts as a contract between the client and the server. So, before moving forward, our first duty should be checking the contract by inspecting the service.

How to get Advanced Rest Client?

It’s highly challenging because wrong data types and parameter data can pop up. One of the most important steps of API testing is to make sure you review the results of your testing. These results will include your response message, response body, and response code.

REST API Testing

Adjust the database and server to comply with the specified guidelines. REST API and an API test online are different, with several key differences regarding structure, design, protocol, support, and more. Some of these data might appear outside of your predefined range of values. Functional testing is required to check the REST APIs are behaving correctly. First, you must download Advanced REST through Google Chrome’s web store. Once installed, you can launch the ARC to learn how to test a REST API.


The best way to monitor and report REST API tests is with coverage-guided testing approaches, as they can provide meaningful coverage and error reports. REST APIs and backend services are often integrated into a layered architecture, which makes it difficult to cover all relevant test cases. In general, REST testing is sending different requests to a REST API and verifying responses from it.

  • Data input and output follow some specific templates or models so that you can create test scripts only once.
  • There are no GUIs available to test the application, making it more difficult to give input values.
  • Designing an API test framework enables developers to customize the test as they are not limited to the capabilities of a specific tool and its plugins.
  • Testing before deployment usually means unit testing, and testing either the underlying business logic of a REST API as well as the API service itself.

Codeception is a BDD-styled PHP testing framework, brought to you by Codeception Team. Codeception uses this simple and lightweight definitions format which can be easily learned and extended. Rest Assured is one of the well known Java-based libraries which is used extensively to automate REST APIs. By using these libraries, you can implement things in more than one form. For example, we either go with Hamcrest or TestNG Assert for assertions. One can also specify the multiple parameters at the API endpoint and separate each parameter by the ‘&’ special character.

Procedure of REST API Testing

A single framework can have a combination of REST tests and UI. This means that it will provide the software free of charge. However, the solutions will have costs according to the requirements.

Trusted by business builders worldwide, the HubSpot Blogs are your number-one source for education and inspiration. The Python import statement carries a security risk that developers and enterprises need to watch out for. Specification-based techniques can play a role in efficient test coverage.

Do not underestimate API automation testing

Next, choose the method for testing from the drop-down list of HTTP methods available for API testing (ex., POST). This is the best course to learn REST APIs for Java developers. The best thing about SoapUI is that you can use this tool to test both SOAP Web Services as well RESTful Web Services or HTTP-based services. Swagger is another great tool for REST API development that you can use to document and share your REST API specification. As a Java developer, this is my preferred way to test REST APIs automatically. If I not doing any manual testing using curl or Postman then I use REST Assured to write tests in Java for our REST APIs.

For example, for some APIs, you will verify the responses against the database; and for some others, it is better to verify the responses against other APIs. APIs, which stands for Application Programming Interfaces, act as the bridge between different software applications. They contain a specific set of code that enables seamless data exchange, leading to collaborative work between applications. API test automation involves executing API tests at predetermined times or frequencies, or within CI/CD pipelines. It improves testing efficiency, reduces the risk of human errors, and enables teams to iterate rapidly and confidently. Postman’s State of the API report indicates that developers, product managers, and other technical stakeholders are spending more of their time on API-related work.

Why is API testing important?

API testing is frequently automated and used by DevOps, quality assurance and development teams for continuous testing practices. API testing is generally performed by using software to send calls to API endpoints to validate the system’s response. A REST API is an interface that allows you to access and manipulate data over the internet. It is a popular way to access data from web-based applications, and is typically used to exchange data between different systems.

REST API Testing

Finally, you’ll need an API testing tool like Postman, which will simplify the testing process while supporting automation and collaboration. Automated API testing tools will save you time and increase the functionality, reliability, and security of your application. Your team should always be able to run manual tests, to validate if the automated tests are still working, as they are supposed to. As always, you need to find the mix that fits your use case best.

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Enterprise allows users to build and scale API programs throughout the enterprise. Nurture and grow your business with customer relationship management software. Before beginning API testing, it’s important to plan out all possible input combinations. Before you start testing, you need to first understand the purpose of the API, how the API functions, and what results to expect when using the API.

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