The 10 API Testing Tools You Can’t Live Without in 2022

REST APIs are generally seen as more flexible and faster than SOAP protocols. Although SOAP protocols slightly decrease the speed of web services, they provide several features such as improved security, atomicity, consistency isolation, and durability . SOAP interfaces can process multiple protocol types (HTTP, SMTP TCP, etc.).

The biggest hurdle for most testers is acclimating to the terminology used when talking about web services. JMeter to run load tests that had exactly one user in them and maybe even one iteration. APIs allow different parts of your application to talk to each other.

REST API Testing

Learn the basics of how to build and send requests in Postman to connect to APIs and inspect responses. Last but not least, besides API testing, do you need to perform other types of testing, such as WebUI or data source? API testing is performed at the business layer between data sources and UI.

Setting up a Basic REST API

It’s very simple, but it’s enough for our work and for practicing. If you need to load test you need to add your own server’s name. There is no standard for the description format of REST services. You can import your REST service in SoapUI by using WADL files.

REST API Testing

So, if you want to know more about REST API automation testing with the help of a short tutorial, dive in! But before jumping on the tutorial, it is extremely important to understand what API, REST, REST API, and automation testing is all about. CurlCurl is an Open Source command-line tool used to transfer data with URLs to/from a server.

Testing DELETE Request

Open the REST Request test step and clickto send the request. SoapUI creates the project complete with a Service, Resource, Method and the actual Request and opens the Request editor. Validating REST API parameters is highly challenging. If they are not validated properly, issues such as wrong string/data types and parameter data outside the predefined value range can come up. needs to review the security of your connection before proceeding. DELETE − This method is used to remove existing representations of the target resource provided by a URI.

It can also be used for analysing and measuring performance of web apps and a variety of services. Initially, it was used to test web apps or FTP apps. Today, it is also used in functional testing, database server testing, and many more. Let’s first set up a basic REST API to write tests against. It’s worth mentioning here that we will be testing a “live” API , so it makes things an “integration test”, as opposed to a “unit test”, which would make use of mocks. Integration tests will give us the best confidence in functionality since it’s hitting the real service we’ll integrate with.

An ability to add and execute a script with batch requests. The server receives the HTTP request and turns to the database. More than 60K API developers and testers have already joined this course and it’s quite hands-on.

REST API Testing

It is a part of integration testing that determines whether the APIs meet the testers’ expectations of functionality, reliability, performance, and security. SoapUI is an API testing tool that is ideal for complicated test scenarios as it allows developers to test REST, SOAP, and Web Services without any hassles. It gives the user a full source framework as it is wholly dedicated to API testing. The real action in a test happens only when a request is sent.

REST API Testing is open-source web automation testing technique that is used for testing RESTful APIs for web applications. The purpose of rest api testing is to record the response of rest api by sending various HTTP/S requests to check if rest api is working fine or not. Rest api testing is done by GET, POST, PUT and DELETE methods.

Related Resources

The service then processes the request and sends a response. GUI should not be the only type of automation a user focuses on, nor should it be the largest piece of the total amount of automated tests that one creates. Involves bypassing a user interface and communicating directly with an application by making calls to its APIs. Your requests can use any standard HTTP protocol method.

Automation is a crucial component for your development team to improve its efficiency. Manual testing is a daunting and error-prone process that you can easily avoid with test automation tools. Verify that the response status code is returned as specified in the requirement, whether it returns a 2xx or error code. For those responses in JSON or XML format, it is easy to get the value of a given key or attribute. Hence, this method is helpful when verifying dynamic content, or individual value rather than the whole content.

Learn How to Secure Your REST APIs

The request method calls trigger your request hooks. Deliver high quality APIs through standards and collaboration with the Insomnia API design platform. No coding required – Its tests are defined in basic YAML or JSON config files. To work with the curl command in the command prompt, you have to download the latest curl and include the folder that has the curl.exe file. Arnab is a UI developer by profession and a blogging enthusiast.

Alternatively, you can save the return value of the request method and use assertions later on in the test. Do not enable the withCredentials option for same-origin requests. Asynchronously call the request method from the test body. This is by far my favorite kind of insomnia 😆 I’ve loved using the @GetInsomnia app during this week’s @LambdaSchool Node.js sprint to test my API. Test requests can be imported from Swagger, Postman, and WSDL.

Payload, the Body contains the actual message that shows the information for the recipient of the message. The UFT Results Viewer always shows the SOAP XML response that was returned from a Web Service. – the Header is optional and is the first child element to appear after the envelope. Headers can contain different types of application-specific information like security authentication or session management info. I believe that once the above terms are demystified, the job of testing web services is pretty straightforward. I also feel the best way to demystify something is to break it down into simple, hands-on examples — which is the approach I will take in this book.

  • Only, instead of Java, you have to write scripts in a language that makes it easier to work with JSON or XML.
  • These quotas allow us to deliver acceptable experiences to our users.
  • REST APIs contribute to the seamless communication between different services.
  • GET– The GET method is used to extract information from the given server using a given URI.
  • It is a software architectural style that possesses rules , which are necessary to be followed by the developers.

Hopefully, this article demonstrates how we can approach testing in a concise and reusable way. Performance –Depending on our business case, performance is a key focus. The quotas themselves will vary from business to api testing best practices business and even endpoint to endpoint. For example, it would be desirable for ‘hot paths’ to be executed a lot quicker than less used endpoints. These quotas allow us to deliver acceptable experiences to our users.


Integration testing focuses on verifying that the interactions of many small components can integrate together without issue. Since API tests bypass the user interface, they tend to be quicker and much more reliable than GUI tests. The sooner bugs are found the better since a developer instantly knows the code changes they made have broken the build and need to be looked at.

Response Status

Is an API tool that facilitates easy testing of REST services. It’s an open-source tool and a Java domain-specific language designed to make REST testing simpler. Moreover, the latest version has fixed OSGi support-related issues. It also offers added support when it comes to using Apache Johnzon. Obviously, the killer feature here is a framework that learns with each test suite execution and maintenance activity.

RapidAPI is the world’s largest API Hub with over 4 Million developers and 35,000 APIs. If you are looking for a continuous testing platform for Agile and DevOps, Tricentis Tosca has got you covered. Codeception is a BDD-styled PHP testing framework, brought to you by Codeception Team. In case you don’t want to write long XML strings, consider using XmlBuilder class. It will help you to build complex XMLs in jQuery-like style.

How to Put Quality in the Build With Jenkins Test Automation

As we discussed earlier, the contract is the source of truth for client and server API integration. With this test coverage, we are now able to confidently deliver experiences that make use of this API. The next step is adding this to our CI system so that any changes to the contract trigger a failure. This is of course, however, outside the scope of this article. Assuming the Content-Type header is set to application/json, we can safely assume the content itself is in that format and attempt to deserialize it into a model.