25 Best API Testing Tools

25 Best API Testing Tools

As the variety of cloud apps and related platforms has expanded, API testing has turn into more and more very important. In fundamental phrases, an API (Application Programming Interface) is the messenger that permits two software program packages to work together and share knowledge. Because there isn’t one, it’s a kind of software program testing that may’t be finished on the entrance finish. We’ve examined a number of of the perfect free API testing instruments on this article. So, proceed studying!

25 Best API Testing Tools

25 Best API Testing Tools

As APIs turn into an important facet of software program growth, API testing is turning into more and more essential for builders and programmers. API testing can’t be finished manually as a result of nature of the API, therefore we should use API take a look at instruments to check APIs. Read our compilation of the perfect API testing instruments under.

1. Katalon Studio

katalon. Best API Testing Tools

Katalon Studio has been named the Gartner Peer Insights Customers’ Choices for Software Test Automation for 3 years in a row, making it the perfect api testing instruments for API, Web, Mobile, and Windows purposes.

  • For initiatives of any dimension, it features a simple person interface and productivity-enhancing options.
  • Free API testing classes and power coaching can be found at Katalon Academy.
  • Katalon Studio is a complete and sturdy API, Web, Desktop, and Mobile testing automation answer.
  • Katalon Studio simplifies deployment by bundling all frameworks, ALM connections, and plugins into one package deal.
  • Katalon Studio stands out among the many finest API testing instruments for its capability to mix UI and API/Web providers for a lot of methods reminiscent of Windows, Mac OS, and Linux.
  • Both computerized and exploratory testing is feasible.
  • In addition to being a free answer, Katalon Studio affords premium assist providers for small groups, companies, and enterprises.
  • Beginners and specialists alike will profit from the Manual and Scripting modes.
  • Sample initiatives are provided for immediate reference.
  • Auto-completion, auto-formatting, and code inspection are all included within the code.
  • Client certificates for REST, SOAP, and SSL are all supported.
  • Swagger 2.0 and three.0, Postman, WSDL, and WADL Native CI/CD connectors are all supported (Jenkins, Azure DevOps, CircleCI, Dockers, and so on.).
  • To create API take a look at knowledge, UI testing could also be employed.
  • To unify reviews and actions, model management methods, CI/CD, take a look at automation instruments, and ALMs all embrace built-in reporting platforms.
  • Code templates that could be custom-made.
  • Its data-driven testing methodologies enhance the protection and reliability of checks.
  • It consists of AssertJ assist for creating BDD-style fluent assertions.

2. ReadyAPI


The ReadyAPI platform from SmartBear permits you to take a look at RESTful, SOAP, GraphQL, and different internet providers for performance, safety, and cargo. This can also be one among finest free API testing instruments.

  • ReadyAPI affords SoapUI, which begins at $659 per 12 months, LoadUI Pro, which begins at $5999 per 12 months, ServiceV Pro, which begins at $1199 per 12 months, and ReadyAPI, which affords customized pricing.
  • The Ready API is obtainable for free for 14 days.
  • It affords a sensible assertion performance that permits you to simply construct assertions for a whole bunch of endpoints.
  • You’ll have the ability to create thorough and data-driven practical API checks.
  • ReadyAPI could also be utilized in any state of affairs.
  • Git, Docker, Jenkins, Azure, and different providers are all supported natively.
  • For automated testing, it additionally affords a command-line interface.
  • ReadyAPI additionally consists of instruments for eradicating dependencies throughout testing and growth.
  • It’s the perfect api testing instruments for practical, safety, and cargo testing RESTful, SOAP, GraphQL, and different internet providers.
  • API practical testing, API efficiency testing, API safety testing, and API and Web virtualization are all provided by a single platform.
  • From begin to end, this platform will show you how to guarantee the standard of all on-line providers.
  • It supplies a variety of custom-made automation strategies for introducing API testing into your CI/CD course of at every growth step.
  • It permits for the execution of practical checks and activity queues in parallel.
  • It has capabilities and instruments for reusing practical checks and creating real looking load conditions.
  • DevOps and Agile Teams profit probably the most from this platform.

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accelq. Best API Testing Tools

ACCELQ is the first cloud-based steady testing platform that automates API and internet testing with out writing a single line of code.

  • ACCELQ assists IT groups of all sizes in accelerating their testing by automating important lifecycle elements reminiscent of take a look at design, planning, growth, and execution.
  • API and UI Test Automation API governance embody API take a look at case administration, take a look at preparation, execution, and monitoring in the identical simplified process.
  • Clients of ACCELQ typically save greater than 70% of the price of change and upkeep efforts in testing, addressing one of many trade’s most urgent points.
  • Planning a regression suite that features necessities monitoring and enterprise course of integration.
  • Natural traceability with CI/CD and Jira/ALM integration.
  • ACCELQ automates API testing with automated take a look at design, codeless automation logic, full take a look at administration, API regression planning, and 360 trackings.
  • Managing a Dynamic Environment.
  • For full end-to-end validation, use Chain API Tests.
  • API Test suite modification impact evaluation made easy and automatic.
  • For complete protection, immediately correlate enterprise processes and APIs.
  • No vendor lock-in, open-source framework that could be prolonged.
  • With an AI-powered core, ACCELQ might present self-healing automation and different distinctive options.

4. Postman


Postman is one other one among finest free API testing instruments for creating APIs. Collections, Workspaces, and Built-in Tools are the three sections of the Postman API Development Environment.

  • A free plan is obtainable for people and small teams. The Postman Pro plan, which is for a staff of fifty employees, is the second possibility. It will price $8 per thirty days for every person. Postman Enterprise is the third plan, which can be utilized by any dimension staff. The month-to-month charge for this plan is $18 per person.
  • For no matter staff dimension, it should will let you share collections, create permissions, and handle participation in quite a few workspaces.
  • The codecs Swagger and RAML (RESTful API Modeling Language) are supported.
  • It affords loads of options, is free, and has obtained loads of nice person critiques.
  • With Postman collections, you possibly can run requests, take a look at and debug them, create automated checks and mock APIs, doc them, and monitor them.
  • ACCELQ’s steady innovation course of supplies a heavy emphasis on design and person expertise, with a persistent effort to expedite testing and enhance provided Quality for its purchasers.
  • Built-in instruments will give the performance that builders might want to function with an API.
  • It assists with automated testing.
  • Aids within the exploratory testing course of.
  • It encourages staff members to share their information.
  • The collaborative options of the Postman workspace will likely be out there to you.
  • Cloud API Test Automation with Zero Code.

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5. REST-Assured

rest assured. Best API Testing Tools

REST-Assured simplifies REST service testing within the Java area. It is one among finest free API testing instruments.

  • It’s a free and open-source program.
  • The Serenity automation framework is included easily.
  • Certain functionalities are pre-installed.
  • REST-Assured accepts XML and JSON requests and responses.
  • It helps the BDD Given/When/Then syntax.
  • It shouldn’t be important to be an HTTP specialist to make the most of this system.

6. Swagger.io


Swagger is a software that can help you all through the total API lifetime.

  • Swagger Hub is available in three varieties: free, staff, and enterprise.
  • The Team plan is $30 per thirty days and consists of two customers. You might select from 2, 5, 10, 15, and 20 customers for this package deal. As the variety of customers grows, the value will rise. The Enterprise plan is the third possibility. The enterprise plan is for teams of 25 or extra customers. To be taught extra about this agency, contact it.
  • This program will will let you take a look at APIs for performance, efficiency, and safety.
  • LoadUI Pro is used for load and efficiency testing.
  • It will will let you reuse SoapUI’s practical checks. Many open-source instruments can be found by Swagger.
  • Swagger Inspector assists builders and QAs in manually validating and exploring cloud APIs.

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7. JMeter

apache jmeter

JMeter is open-source software program for software load and efficiency testing.

  • Its structure is constructed on plugins. Jmeter is able to producing take a look at knowledge.
  • It’s cross-platform pleasant. A protocol analyzer is Jmeter.
  • As a unit take a look at, builders might use this software to check JDBC database connections.
  • You’ll have the ability to use a variety of programming languages with it.
  • Jmeter additionally has configurable choices and a number of other completely different reviews.
  • This software is ideal for load and efficiency testing of internet purposes.
  • It has a command-line mode, which is beneficial for Java-compatible working methods.
  • Many completely different packages, servers, and protocols are loaded and efficiency examined.
  • You might use it to playback take a look at outcomes.
  • It helps variable parameterization in addition to assertions.
  • Per-thread cookies are supported.

8. Karate DSL

karate dsl

Karate DSL is an open-source API testing framework. The cucumber library serves as the muse for the Karate framework.

  • Intuit has revealed this software that’s particularly constructed for automated API testing.
  • This software permits a tester to construct internet service checks in a domain-specific language.
  • However, a fundamental understanding of HTTP, JSON, XML, XPath, and JsonPath will likely be advantageous.
  • It is potential to run many threads in parallel.
  • It allows you to regulate settings.
  • It permits you to create checks in any language that understands HTTP, JSON, or XML.
  • programming language shouldn’t be required to make the most of this software.
  • Payload knowledge might be reused for API testing.

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9. Airborne

airborne. Best API Testing Tools

Airborne is a free and open-source API testing framework.

  • It’s an RSpec-driven Ruby framework.
  • This utility has no person interface. It simply offers a textual content file through which to write down the code.
  • It’s suitable with Rails-based APIs.
  • To use this software, it’s essential to have a fundamental understanding of Ruby and RSpec.
  • It is suitable with Rack-based purposes.

10. Pyresttest


Pyresttest is a python-based software for RESTful API testing.

  • It can also be used for micro-benchmarking.
  • JSON config information are supported for testing. Python permits you to customise the software.
  • For unsuccessful outcomes, return exit codes.
  • The creation of take a look at situations utilizing applied sciences reminiscent of generate/extract/validate.
  • It is easy to deploy on the server resulting from its minimal necessities, which is beneficial for smoke testing.
  • No code is critical.

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11. Apigee

apigee. Best API Testing Tools

Apigee is a platform for managing APIs throughout many clouds.

  • Apigee has 4 worth choices: Free Evaluation, $500 per thirty days for Team, $2500 per thirty days for Business, and Enterprise for which it’s essential to contact them.
  • A free trial can also be included with the software.
  • The Business plan consists of IP whitelisting, Java and Python callouts, and distributed visitors administration.
  • The Team plan consists of API analytics, Web service callouts, and extra controls like safety, mediation, and protocol.
  • The Enterprise package deal consists of extra safety from Apigee Sense, a distributed community for low latency, monetization for brand spanking new enterprise fashions, and visitors isolation.
  • For all APIs, supplies safety and governance insurance policies. The utility makes it easy to assemble API proxies utilizing the open API definition.
  • You can develop, defend, consider, and develop APIs from wherever utilizing this software.
  • It has a developer portal that could be custom-made.
  • It works with Node.js.

12. RapidAPI

rapid api

RapidAPI is the primary software on our checklist of the perfect API testing instruments. A free trial can also be included with the software.

  • The Business plan consists of IP whitelisting, Java and Python callouts, and distributed visitors administration.
  • The Team plan consists of API analytics, Web service callouts, and extra controls like safety, mediation, and protocol.
  • The Enterprise package deal consists of extra safety from Apigee Sense, a distributed community for low latency, monetization for brand spanking new enterprise fashions, and visitors isolation.

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13. SoapUI

soap UI

SoapUI is a headless software program answer devoted fully to API testing that permits you to run checks on SOAP APIs in addition to internet providers REST.

  • It is among the hottest instruments amongst testers because it permits them to design difficult situations and helps asynchronous testing.
  • It additionally distinguishes out for its user-friendliness and excellent data-driven testing.
  • SoapUI comes with two bundles, one free and the opposite paid (the professional package deal).
  • The free answer is straightforward to make use of, and testers might reuse scripts.
  • With the professional package deal, it may well additionally write customized code, extract knowledge (from databases, information, and excels), and allow native CI/CD integrations.

14. Tricentis

tricentis. Best API Testing Tools

Tricentis is a well-liked possibility for corporations seeking to incorporate Agile and DevOps practices.

  • Pricing will range relying on the options of every bundle.
  • It employs model-based take a look at automation, which simplifies script upkeep and facilitates regression testing.
  • One of probably the most important advantages is that it helps a variety of protocols, together with REST, SOAP, HTTP(s), MQ, JMS, NET TCP, IBM MQ, and others.
  • Tricentis additionally supplies end-to-end testing for cellular, cross-browser, and bundled apps, which is a big benefit.

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15. Assertible


Assertible is extensively regarded by builders and testers as among the finest api testing instruments with a powerful deal with dependability.

  • It permits API checks at each stage from steady integration by the supply pipeline.
  • Users will discover Assertible to be extremely helpful.
  • It’s suitable with GitHub, Zapier, and Slack.
  • Additionally, Assertible makes use of readymade assertions to validate HTTP replies.
  • There are three packages out there for this API testing software. The extraordinary version prices $25 per thirty days; the startup plan is $50 per thirty days; and the marketing strategy, which prices $100 per thirty days, is the costliest (and has probably the most options).
  • Additionally, a free private plan is obtainable for working extra manageable API checks and studying how Assertible works.

16. API Fortress (Now Sauce Labs)

sauselabs. Best API Testing Tools

API Fortress is one other finest free API testing instruments. It simplifies the creation, execution, and automation of efficiency and practical testing.

  • As a outcome, it’s probably the most complete SOAP and REST monitoring answer available on the market.
  • The gadget can also be famous for its ease of use.
  • It additionally has one-click take a look at integration and works with each bodily and cloud {hardware}.
  • The annual price of API Fortress varies between $1,500 and $5,000. The quantity that a corporation is required to pay can also be determined by the undertaking’s particular standards.
  • API Fortress will increase openness, which helps builders keep away from redundancies and break down enterprise silos.
  • Its person interface is right for these with much less technical information.

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17. Hoppscotch


Hoppscotch, an open-source API testing software that competes with the extensively recognized Postman API testing software, was the forerunner of Hoppscotch. The software itself has a complete assortment of options that make testing simple. Here are a number of noteworthy options.

  • Liyas Thomas created the undertaking, which he initially offered on Hackernoon.
  • Hoppscotch advertises itself as a simple API testing software with a easy person interface.
  • Create a full-duplex communication channel over a single TCP connection.
  • To ship occasions, the stream server utilized an HTTP connection.
  • You might transmit and obtain knowledge with a SocketIO server.
  • Topics on the MQTT Broker might be subscribed to and revealed.
  • Similar to Postman, chances are you’ll entry a historical past of earlier inquiries, create collections for storing API requests, and arrange a proxy to entry restricted APIs.
  • Hoppscotch is totally free to make use of, nevertheless, donations might be made by way of PayPal or Patreon.
  • The undertaking has modified its identify and obtained over 26.000 rankings on GitHub after greater than a 12 months.

18. Testim

testim. Best API Testing Tools

Testim is one among finest free API testing instruments. It is basically a full-fledged take a look at automation platform, with API testing as a element.

  • You might then tailor the fee to your staff’s necessities.
  • Testim is uncommon in that it makes use of synthetic intelligence to assist with take a look at suite execution, upkeep, and even creation.
  • This consists of testing your API.
  • For typical testing actions, you may additionally create API actions and validations.
  • Testim, alternatively, runs on a freemium mannequin, making it easy to get began by gathering knowledge out of your API and instantly exercising the person interface.
  • The main characteristic here’s a framework that learns as you run and preserve your take a look at suite.
  • It’s a nice strategy to check the UI and API on the similar time.

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19. Rest Console

rest console

The Rest Console software is a Google Chrome REST/HTTP Client that permits customers to visually create and take a look at customized HTTP requests with any RESTful API service.

  • A easy person interface could also be used to alter customized headers.
  • Allow customers so as to add question parameters with ease.
  • Plain, Basic, and OAuth are among the authentication methods that could be used with it.
  • The person interface could also be custom-made.
  • Rest Console v4.0.2 has been up to date to incorporate a number of new options and bug fixes that can improve the person expertise (e.g., oAuth enhancements, Collapsible sections, Clickable Links in Response, UI enhancements).
  • Build a POST or PUT physique from uncooked enter.

20. Dredd


Dredd is one other one among finest free API testing instruments. It is a command-line interface for testing APIs and documentation.

  • It permits you to run ad-hoc checks utilizing the identify and URL of the API documentation.
  • Dredd examines the API documentation and compares every response to the requirements.
  • As a consequence, it not solely confirms the accuracy of the documentation but additionally places the API to the take a look at.
  • Among the languages supported are PHP, Node.js, Python, Rust, Ruby, Perl, and Go.
  • It’s simple to make use of and works with a variety of programming languages.
  • It validates APIs in addition to their documentation.
  • Hooks are additionally acceptable.

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21. Citrus

citrus. Best API Testing Tools

Citrus is an information format and communications protocol-based automated testing software.

  • It might help you in automating integration testing for any messaging protocol or knowledge kind.
  • HTTP, REST, JMS, and SOAP testing are all supported by Citrus.
  • It supplies sturdy XML message content material validation options and permits advanced testing logic to be written.
  • Citrus is at all times there that can assist you meet your high quality, operate, and stability targets.
  • The transfer from growth to manufacturing is seamless.

22. Fiddler


Fiddler is a free internet debugging proxy that could be used with any browser, working system, or platform. This can also be one among finest free API testing instruments.

  • Fiddler permits you to monitor, modify, and reuse HTTP requests.
  • It information community exercise between the Internet and take a look at PCs, which helps with on-line software debugging.
  • The program is primarily used to watch community visitors between a pc and the Internet.
  • It is free to obtain and use, however company assist prices cash.
  • Any web browser, in addition to any working system or platform, might use this system.
  • For extra highly effective add-ons, use the.NET programming language.
  • Perfect for novice to skilled testers.

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23. RedwoodHQ

redwood HQ

RedwoodHQ is an open-source SOAP/REST API testing software. Java/Groovy, Python, and C# are among the many languages it helps.

  • It makes use of a web-based interface to permit a number of testers to run checks on the identical software.
  • For builders, this efficiency testing software could also be too shallow.
  • It permits customers to check the outcomes of every run.
  • An open-source take a look at automation framework.
  • To automate any person interface, hook up with open-source automation instruments like Selenium, Appium, Silk4J, and others.

24. Appium

aapium. Best API Testing Tools

Appium is primarily used to check cellular purposes, nevertheless, that doesn’t indicate it’s restricted in its capabilities.

  • It’s one of many open-source automated testing instruments designed particularly for cellular apps.
  • It can automate native, hybrid, and cellular internet apps for iOS and Android.
  • Appium has turn into one of the vital well-liked and dependable cellular automated testing options.
  • Because it makes use of the WebDriver API, it’s simple to make use of for earlier internet take a look at automation professionals.
  • It’s open-source and free.
  • It takes care of the connection between Appium’s server and Xcode’s instruments all through execution.
  • Java, Python, Ruby, C#, and extra programming languages are supported.

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25. RoboHydra Server

robohydra server

RoboHydra Server is a superb API testing answer for many who don’t have entry to a server but want one.

  • It’s a software for testing HTTP-based purchasers, or software program that sends HTTP queries.
  • User interfaces for cellular purposes, public APIs, and Java-based methods are all supported.
  • RoboHydra is a multifunctional robotic.
  • It permits clients-under-test to hook up with it and execute checks.
  • Any HTTP, HTTPS, or WebSockets shopper could also be examined.
  • It’s written in JavaScript and runs on Node.js.


We hope that this information was useful and you might discover finest API testing instruments. Let us know which methodology labored for you the perfect. Drop queries or options within the feedback part under.