Application Programming Interface (API) is the middle layer between the database and presentation (UI) in software app development. It enables data exchange and communication between different software systems. It is a software testing practice for testing APIs regarding performance, functionality, reliability, and security when it comes to API testing. API testing strongly validates the build architecture logic in the least amount of time. It is vital for detecting security flaws in apps and delivering fast feedback for developers and testers.
API testing is challenging and complicated because it is based on certain protocols and standards that users rarely encounter with other testing types. Validation testing, functional testing, UI testing, security testing, load testing, fuzz testing, penetration testing, and runtime and error detection testing are the most common types of API testing. API testing automates the software testing process because it is hard to maintain regular changes and short release cycles in agile software development and DevOps. Here, API testing tools make things relatively easy and provide control for software testers and developers. Below are some popular API testing tools available in the competitive market.
What Are the Top 5 API Testing Tools
According to data released by marketsandmarkets.com, the size of the global API testing market is expected to rise to USD 1,099.1 million by 2022. It will grow at a Compound Annual Growth Rate (CAGR) of 19.69% from 2017 to 2022. APIs help companies update the workflow, become productive, and personalize the user experience. They also let organizations customize services and embed content from any app or site. API Testing becomes vital as shorter development cycles add high pressure on automated testing in agile development.
Primarily, all API testing tools come with specific features for validating your REST APIs quickly. They make UI easy to use, write tests, and support different validation types and advanced validation expressions.
Katalon Studio API Testing
Katalon Studio is a free test automation tool for APIs, web, desktop, and mobile apps. This crucial tool for API/Web services testing is a total end-to-end automation solution for application developers and testers. It supports a data-driven approach, CI/CD integration, automated testing, assertion libraries, and SOAP and REST.
- Application under test: API/web/desktop/mobile apps
- Supported platform: Windows/Linux/MacOS
- Ease of use and installation: Easy to use and set up
- Rating: 5/6
SoapUI API Testing
It is an on-premises API testing tool that developers prefer to test REST, SOAP, GraphQL, and Web Services. SoapUI is a powerful solution for development and testing teams for running, creating, and analyzing complex tests. It also comes with loads of attractions, including test reports, SOAP API testing, and many more.
- Application under test: API
- Supported platform: Windows/Linux/MacOS
- Ease of use and installation: Easy to use and set up
- Rating: N/A
Postman API Testing
Postman is a superb choice for API testing for developers who don’t prefer dealing with coding in an integrated development environment, leveraging the same language as the developers. It has an easy-to-use REST client with a rich interface. Postman runs well on Chrome, Mac, Windows, and Linux. It comes with various integrations and is suitable for automated and exploratory testing.
- Application under test: API
- Supported platform: Windows/Linux/MacOS
- Ease of use and installation: Easy to use and set up
- Rating: 5/6
Read more: Automate API testing with Postman testing platform
Tricentis API Testing
Tricentis Tosca is a popular platform for continuous testing for Agile and DevOps. It supports the following protocols: HTTP(s), JMS, TIBCO EMS, SOAP, REST, IBM MQ, AMQP, RabbitMQ, and NET TCP protocols. The best part of this testing type is that it easily integrates into the Agile and DevOps Cycle. It lets testers do API testing across mobile, cross-browser, and packaged apps.
- Application under test: API/web/desktop/mobile apps
- Supported platform: Windows
- Ease of use and installation: Easy to use and set up (training needed)
- Rating: 5/6
Apigee API Testing
Apigee allows testers to measure and test API performance and support and build API. This cross-cloud API testing tool easily creates API proxies and deploys and scales APIs. It resolves performance issues by tracking error rates, API traffic, and response times. Remember that this testing tool is a multi-step option and is powered by JavaScript.
- Application under test: API
- Supported platform: Windows/Linux/MacOS
- Ease of use and installation: Requires endpoint management knowledge
- Rating: 5/6
Conclusion
When it comes to picking up a competent and professional software testing company, you need to check out a few points concerning its unique solution propositions (USPs) and software quality assurance testing services. It will be good if the company of your choice knows how to bring the best out of modern API testing tools and techniques professionally.
Make sure the testing partner you choose has the following features. These include a productive IDE for API automation, API-centric solutions, testing with modern frameworks, sustainable and scalable platforms, and minimal maintenance options.
Frequently Asked Questions
API testing tools help teams validate API functionality, performance, security, and reliability without relying entirely on the application’s user interface. They help identify defects early and improve overall software quality.
Businesses should consider automation capabilities, API protocol support, test scripting, CI/CD integration, reporting, security testing, scalability, collaboration features, and ease of use when selecting an API testing tool.
API testing tools can support functional, integration, regression, performance, load, security, and validation testing. Organizations can combine different testing approaches based on their application and business requirements.
They automate repetitive testing, detect API defects earlier, improve test coverage, and integrate with development pipelines. This helps teams reduce manual effort and release reliable applications faster.
A testing partner can evaluate project requirements, recommend suitable tools, build automation frameworks, integrate API testing with CI/CD pipelines, and create scalable testing strategies for long-term quality assurance.
