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Top API Testing Tools for Developers

api testing tools
Posted by
Jan 4 2022

Have you heard of API testing? Wondering What are API testing tools? Well, it can be defined as a type of software testing that focuses on determining if APIs meet expectations.

In other words, it is all about checking if the applications meet the functions, performance, reliability, and security expectations.
It has become quite important for all software companies. According to Google Trends, the interest in API testing has increased in the past few years.

As there is no graphic user interface, it makes testing performance on the front end quite difficult. As mentioned above, API has become quite important for software development. This is why here are some of the top API testing tools mentioned below, which you can count on.

  1. Postman
    If you remember, then you would know that Postman was introduced as a Google Chrome plugin. The main goal for it was to be a functional API testing tool. It has expanded its services to both Windows and Mac platforms.Compared to the other tools, Postman is one of the easiest to use. It is easy to set up parameters on method calls and has the ability to store commands. This tool comes with an interface that gives access to extract web API data.

    Other than that, it has built-in tools, collections, and workspaces which have proven to be quite useful. It supports formats of different kinds along with RAML and Swagger. This useful tool for API testing is free to use, and with the paid one, you will get to discover additional features.

    Read More:- Software Development Tools

  2. Hoppscotch
    Hoppscotch was probably started as a postwoman, which was an alternative for the free API testing tool called Postman. Later it was renamed and gained over more than 26 thousand stars on Github.It is one of the most lightweight tools that you would come across with a minimalist user interface. Loaded with tons of features and functionalities, it allows sending and receiving data with the help of the SocketIO server.

    Furthermore, it has an open full-duplex communication channel over one TCP connection and also allows sending graphic queries. You can also stream server-sent events over the HTTP connection, besides publishing and subscribing to the topics of the MQTT broker.

  3. Tricentis Tosca
    Tricentis Tosca is also an API testing tool that helps users to conduct continuous testing for Agile and DevOps.It helps in reducing the time of regression testing and achieving sustainable automation with the new technology. The excellent result and dashboard give an amazing view of the results.

    Tricentis Tosca maximizes reuse and maintainability with model-based test automation.

    The API tests can be used not only on mobile but cross-browser and packaged applications too. Moreover, it supports different types of protocols, including JMS, AMQP, Rabbit MQ, SOAP, REST, IBM MQ, NET TCP, and others.

  4. Rest Assured
    Rest Assured is another API automation tests tool that facilitates easy testing of the REST services. Being an open-source tool, it has a Java domain-specific language that is designed to make the process of REST testing simple and easy.It comes with built-in functionalities that do not need one to begin coding from scratch.

    Also, one does not need to have excessive knowledge of HTTP to work with this tool. With the help of the Serenity Automation framework, this rest API testing tool makes integration possible and easier. Also, it offers multiple authentication mechanisms to work on.

  5. Ready API
    Ready API is powered by Smartbear and is one of the popular API testing tools you would find. Besides being a web service launcher, this tool has the potential to analyze the results straight from the dashboard.It makes sure that complete quality checks for all the web services are done and eliminates dependencies.
    Furthermore, it supports the integration of API testing with the CI / CD pipeline too. Ready API is a four-in-one tool – meaning it offers features like assimilating API performance testing, API functional testing, API virtualization, and API security testing too.
  6. JMeter
    JMeter was designed to perform load testing and is quite popular for functional API testing. It offers features like bug fixing, core enhancements and works well with CSV files.This open-source API testing tool creates an integration between JMeter and Jenkins, which gives users the access to add API tests within the CI pipelines.

    It can be utilized in static and dynamic resource performance testing and allows users to replay the results. JMeter also supports per-thread cookies. Besides that, it allows the team to build unique parameters values for the tests.

  7. API FortressA tool that builds, executes, and automates performance along with functional testing is API fortress. It is considered in the list of best API testing tools for SOAP and REST.

    The tool is quite easy to use and helps to discard redundancy and cut off silos from an organization by improving transparency. With robust notification and data integration, API Fortress comes with regression testing too.

    It comes with a perfect user interface and seems to be the best tool for those who have no technical background. With this tool, you get a one-click test integration function and is totally compatible with cloud and physical hardware too.

  8. RestSharp
    Restsharp is also an API testing solution that helps users to create .Net APIs and then test them with similar tools.
    It is quite handy for Windows developers who use REST and SOAP APIs in order to communicate with the external data.
    This tool is quite simple to understand and easy to use. It supports both asynchronous and synchronous requests without much trouble.
  9. Rapid APIRapid API is declared one of the largest and most popular automated API testing tools of today’s time.
    With this tool, you can easily search, test, and connect thousands of APIs using just one account. It also allows the users to collaborate easily with external and internal APIs with the help of Rapid API for teams.
    The best part about this tool is that it is totally free to use and can test as many APIs as you want without any restriction. It has created one workspace for more than 10 thousand public APIs, which is indeed difficult to find in any other tool.
  10. SoapUI
    SoapUI is an on-prem API testing tool that gives access to the developers so that they can test, REST, SOAP, GraphQL, and web services. With the help of this software, the developers and testing teams can create a very powerful solution.
    They are also given the power to run and analyze complex tests on web services, and while talking about its features, then it is almost unthinkable and powered with exceptions.The testing tool allows one to test reports, SOAP API testing, and create custom codes with the help of Groovy. Besides that, it allows transferring data from one response to another API calls without needing manual intervention.

    Moreover, the best part about using Soap UI is that it does not bring any kind of changes to the work. This means everything will be stored so that you can get started from where you stopped.
    Lastly, these most powerful tools for REST and SOAP APIs come in two packages. The first one is the free package, where users get access to the full source code. At the same time, the fixed one comes with advanced features which take API testing to another level.

  11. Citrus
    We are introducing you to the next automated testing tool in the list called Citrus. It comes with messaging protocols and data formats along with great documentation features.The tool has the ability to test SOAP, HTTP, JMS, and REST too. With this tool, you can easily achieve your quality, function, and stability goals.

    Furthermore, when it comes to integration testing, it can automate the process virtually for any messaging protocol apart from the data format. It also has a robust validation mechanism for XML message contents and offers trouble-free migration from development to production.

  12. Assertible
    A tool that concentrates on reliability and automation is this. Assertible has gained open-source tools with GitHub forms. It comes with the sync feature, which further gives users the access to update their tests whenever there are changes made in the specifications.This tool backs the automation of API tests right at each stage of the explicit continuous integration and precise delivery pipeline. It offers support for operating the API tests after the deployments and integration with familiar tools like Slack and Zapier.

    Furthermore, Assertible allows reducing the bugs in the application by giving users access to create an Automated QA system.

  13. Katalon StudioIt is a free testing automation tool that one can use for various purposes, such as to test web applications, standalone apps, mobile apps, and more.

    Ever since it was introduced, it has gained popularity for being the most prominent tool for API and web services testing. It also supports SOAP and REST requests besides a variety of commands and parameterization features.

    Furthermore, the tool backs data-steered tactics, enables CI/CD integrations, automatic and investigative testing. Katalon Studio is perfect for both professionals and people with less technical knowledge. Undoubtedly it is a complete package and a framework you can count on.

  14. Testim
    A tool that is basically a test automation platform with a subset of API testing is Testim. The amazing feature of this tool is that it uses artificial intelligence to help with the test suite, execution, maintenance, and building too.Having the top API management features, Testim helps to create API actions and even validations for standard testing activities. It also has the potential to isolate the user interface testing by extracting the data from API.

    Not to mention, this tool is definitely a powerful way by which you can test the UI along with the API in a parallel way. The tool comes with a freemium model and also allows users to customize the pricing as per your organizations’ requirements.

  15. Karate DSL
    If you are tired of writing down the step definition, then Karate DSL is a tool that you should check out. This tool helps to create scenarios for API-based BDD tests without any hassle.You will get access to those definitions and operate testing without any problem. It provides easy-to-write tests for those who have less knowledge of programming.

    Besides that, it completely supports multithreaded parallel execution and configuration switching too. Karate DSL allows users to execute tests on any project using Java as it has been masterfully built on top of Cucumber JVM.

  16. Paw
    This API performance testing tool has been specially designed for Mac. It is perfect for both API makers and consumers as it helps to build HTTP requests and has an excellent interface.The tool is known for having a stable performance when compared to others and comes with multidimensional environment settings too. Using Paw, you can generate client codes and inspect server responses too.
  17. Apigee
    Here comes the cross-cloud API testing tool called Apigee that offers API management features too. It gives users the access to measure and test the performance of API besides supporting and building them with the help of Swagger.
    The developers have strategized this tool for digital business solutions and for data-rich mobile-driven APIs. Apigee offers complete support to Node.js and helps to find out the performance issues by tracking API traffic, error rates, and response times.
    Moreover, it is capable of creating API proxies out of the Open API specification and finally bringing them to the cloud environment through easy steps. The tool is powered by JavaScript and is purpose-built for digital businesses.
  18. AirBorne
    If you are searching for a Ruby-based RSpecdriven API testing framework, then count on Air Borne.This is an open-source tool that does not have a UI and offers text files to write down the codes.

    It works quite well enough with the rack applications like Grape. Moreover, the testers need to remember a number of key methods in the toolset and a few Ruby and Rspec fundamentals in order to use this tool.

  19. Web Inject
    Introduce yourself to Web Inject, which can be defined as an open-source solution. It offers automated testing of web applications and web services.With this tool, you can collect and analyze the results to create an automated report. It is written in Peri and can be installed on different platforms like MS Windows, GNU, Linux, Solaris, Mac OS, etc.

    Users can run this tool on different platforms easily using the PERL interpretation. Moreover, it creates fully automated test suites for functional, regression, and acceptance testing. Lastly, this is one of the most trusted tools which you will find in the market.

  20. Fiddler
    Fiddler has been developed by Telerik and is the first choice of many developers and testers who create and verify API exposed over HTTPS all around the globe. It can also be introduced as a free web debugging proxy for browsers, systems, and platforms.With this specific tool, you can easily debug web-based applications by seizing networking traffic amid the online sources and test-based computers. It allows the users to monitor, manipulate and reuse HTTP requests and is perfect for Layman testers to proficient ones.

    The tool ensures that proper cookies, headers, and cache directives are transferred between the client and the server. The Fiddlers API composer makes it all easy and quick to test, group, and organize the API requests.

    It also supports any framework, including Ruby, Java, and NET. Furthermore, Fiddler comes with .Net language for a more powerful add-on and is completely free to use. But with the paid option, you can get access to enterprise support.

Best Recommendations and Tips to Pick the Best API testing tool!

With so many options available in the market, it really must be difficult to choose the right one. Isn’t it?

To favor your difficulty, here are some tips listed below which can help you pick the best API testing tool.

  • Ability to integrate – The tool should have the ability to integrate with a continuous integration pipeline.
  • Sharing options – The tool you are selecting should have speedy sharing options along with options of synchronization for the teams.
  • Generate API directly – Any tool you are choosing should have the potential to generate API documentation directly from the testing tool itself.
  • Ability to improve execution time – When choosing a testing solution for API testing, make sure that it comes with the possibility to run asynchronous tests so that it can help in improving the execution time.
  • User interface – It should have an easy-to-use user interface. Besides that, the tool should be able to group the API requests and organize them into collections.

Moving Forward: Get the best API tool now!

These were some of the perfect API testing tools for users having diverse requirements. The tools mentioned above are all great for testing REST, SOAP, or HTTP APIs besides making sure that no error is caused.

Some of them come totally free to use, while others have paid options available to enjoy the advanced features.

So, depending on the requirements of your organization, you can choose any one of the above tools without thinking twice.