16 Best API Testing Tools (2024)
An API or Application Programming Interface is a collection of software functions and procedures through which other software applications can be accessed or executed. In API Testing you use software to send calls to the API, get output and log the system’s response. For Agile development, Api Testing becomes important as shorter development cycles put more pressure on automated testing.
Here is a list of top Web Services Testing API Tools. The list contains both open-source(free) and premium web API testing tools. Read more…
API Testing Tools (REST Automation Software & Framework)
Name | Supported Platforms | Free Trial | Link |
---|---|---|---|
ReadyAPI | Cloud based | 14-day Free trial (No Credit Card Required) | Learn More |
BlazeMeter | Windows, Linux, MacOS | Lifetime free basic plan | Learn More |
Katalon Platform | Windows, Linux, MacOS | Lifetime Free Basic Plan | Learn More |
Postman | Windows, Linux, MacOS | 30-day Free trial | Learn More |
MicroFocus UFT One | Windows | Request a free quote from sales | Learn More |
1) ReadyAPI
ReadyAPI is a leading tool for functional, security, and load testing of RESTful, SOAP, GraphQL, and other web services.In one intuitive platform, you will get four powerful tools, API functional testing, API performance testing, API security testing, and API & Web virtualization. You can easily integrate your CI/CD pipeline during every build.
Supports Command-line for automated testing.
Integrations: Git, Docker, Jenkins, Azure etc.
Supported Platforms: Cloud based
Free Trial: 14-day Free trial (No Credit Card Required)
Features:
- ReadyAPI can be integrated into any environment.
- It has a Smart Assertion feature that can create bulk assertions against hundreds of endpoints quickly.
- Native support for Git, Docker, Jenkins, Azure, etc.
- Supports Command-line for automated testing.
- Supports parallel execution of functional tests and job queuing.
- Promotes code reuse
- Removes dependencies during testing and development.
- Price: Plans start at $895/license (billed annually)
Pros
Cons
14-day Free trial (No Credit Card Required)
2) BlazeMeter
BlazeMeter is an industry-leading API testing and monitoring tool. The 360° API Testing helps teams understand exactly how their API behaves. BlazeMeter can create API tests in minutes and start monitoring your APIs from early development through production. Integrates with open-source and 3rd-party tools such as Jenkins, PagerDuty, and Slack and notifies the right team at the right time when API issues arise.
Full development lifecycle API monitoring
Integrations: AWS, Selenium, Git, Slack, etc.
Supported Platforms: Windows, Linux, MacOS
Free Trial: Lifetime Free Basic Plan
Features:
- API data verification
- Custom validation rules
- Test complex workflows
- API testing through a single, streamlined platform – from development to production
- Enhanced collaboration for API monitoring via shareable links
- CI/CD pipeline integration
- 19 different API monitoring locations across the globe
- Identify issues & improve quality by combining API testing & performance testing
- Full development lifecycle API monitoring
Pros
Cons
Lifetime Free Basic Plan
3) Katalon Platform
Katalon Platform is an AI-powered all-in-one test automation platform that makes it easy to create and run automated API tests. You can leverage its keyword library to quickly automate any action you want and execute in the environment of your choice. The great thing is you can test more than just API: web, desktop, and mobile app testing is also a simple process with Katalon!
Write tests faster, better, at lower cost and maintenance effort
Integrations: Azure Devops, CircleCI, Jenkins, Jira, Xray, Zephyr, Slack, etc.
Supported Platforms: Windows,Linux, MacOS
Free Trial: 30-Day Free Trial
Features:
- Supports all types of REST, SOAP requests, GraphQL, Web Services, and SSL client certificates.
- Easily import tests from Swagger (2.0 & 3.0), Postman, WSDL, and WADL.
- Data-driven testing frameworks ready-to-use
- Create fluent assertions in BDD style with AssertJ support.
- Support set up API test data using UI testing.
- AI-powered code generation and explanation along
- Provide insightful test report dashboards of all testing stages for better monitoring and collaboration across teams.
- Price: Lifetime free basic plan
Pros
Cons
Lifetime Free Basic Plan
4) Postman
Postman is a plugin in Google Chrome, and it can be used for testing API services. It is a powerful HTTP client to test web services. For manual or exploratory testing, Postman is a good choice for testing API.
Features:
- With Postman, almost all modern web API data can be extracted
- You can write Boolean tests within Postman Interface
- You can create a collection of REST calls and save each call as part of a collection for execution in future
- Unlike CURL, it is not a command line based tool, which makes this tool hassle free of pasting text into command line window
- For transmitting and receiving REST information, Postman is more reliable
- Price: Lifetime free basic plan
Pros
Cons
30-day Free trial
5) MicroFocus UFT One
MicroFocus UFT One provides an extensible framework helpful in executing and building the functionality of a headless system that does not have a user interface.
Features:
- It is one of the best API testing tools to test headless technologies like Databases and Webservices, JMS, etc.
- By using the API test conversion tool, you can convert SoapUI tests to UFT (QTP) API tests.
- Easy to use GUI to create API tests with Robust Test Reports
- Price: Request a free quote from sales
Pros
Cons
6) vREST
vREST API testing tool provides an online solution for automated testing, mocking, automated recording, and specification of REST/HTTP APIs/RESTful APIs.
Features:
- It provides an exhaustive tool to quickly validate your REST APIs
- This rest API testing tool delivers zero defect web applications with less effort in API testing
- To validate your web application, no skilled resources are required, and it can generate documentation for your API specifications
- API mocks can be created in vREST with the help of Mock Server Functionality. Users can directly start developing frontend using mock HTTP requests
- Price: Lifetime free basic plan
Pros
Cons
7) HttpMaster
It is a web development tool to automate web application testing, including API testing, service testing, and website testing. It is one of the best web API testing tools primarily used as a web API test tool to automate the testing of web API calls. HttpMaster is the best choice for API testing as it has got:
Features:
- Several HTTP methods (GET, POST, DELETE etc.)
- Dynamic parameters of various data types to make batches of different API requests
- Various validation types and advanced validation expressions
- Price: Plans start at $99 per single license
Pros
Cons
8) SOAP Sonar
SOAPSonar is an API testing and diagnostics platform for SOAP, XML, REST-based web services. Use external sources like Excel, MS SQL, Oracle or any ODBC Database for automated tests.
Features:
- This web services test tool identifies Web Services vulnerabilities like Malware Threat and SQL Injection
- Web Service Functional Testing with Success Rule Framework and Concurrent Client Load Testing
- Native HP QC Integration, and supports integration with Hudson, Ant, and JUnit
- Price: Lifetime free basic plan
Pros
Cons
9) Ping API
Ping-API is an API testing tool that allows writing test scripts in JavaScript and CoffeeScript to test your APIs. It is one of the best API testing tools, which allows inspecting HTTP API call with complete request and response data. For any failures, the user gets a notification through email, slack.
Features:
- This API automation testing tools use Ping- API to schedule tests every minute or hour
- Support for writing script to set request headers, body, and URL parameters. It supports writing scripts to validate response headers and body
- It is one of the best API tools that validates CRUD flow
- Price: Lifetime free basic plan
Pros
Cons
10) Rest-assured
It’s a popular rest API testing framework to test REST services in Java. It is one of the best API testing tools which helps developers to build, debug and test RESTful API’s.
Features:
- Construct POST or PUT body via raw input
- Easy query parameters creation
- Add custom headers through intuitive UI
- Keyboard navigation and shortcuts
- It’s minimal dependencies, which allows easy deployment on-server for smoke tests/health checks.
- This REST API test tool will return exit codes on failure
- Allows to generate/extract and validate mechanisms to build test scenarios
- Price: Free Download
Pros
Cons
11) Karate DSL
Karate is a new API testing framework base on the cucumber library. Karate DSL allows testers to write meaningful tests for web services using a domain-specific language.
Features:
- It supports configuration switching/staging, multi-threaded parallel execution.
- Allows testing and generating reports just like any standard Java Project
- Possible to write tests even for the non-programmers
- The karate API testing tool allows the re-use of payload data and user-defined functions across tests.
- Price: Free to use
Pros
Cons
12) Hippie-Swagger
Hippie-swagger is a tool for testing APIS. It is one of the best api testing tools which supports a clear assertion syntax, for extending test behavior. It also allows clean printing reports.
Features:
- It will fail test whenever swagger documentation is either erroneous or missing
- Readable and accurate assertation messages
- This tools for api testing validated parameters, request, response, pats, etc.
- It is a programming and rest api testing framework, so it has no user interface apart from the text file to create code
- Price: Free to use
Pros
Cons
13) JMeter
JMeter is used for functional API testing. It is one of the best API testing tools, which has features that help to boost the performance of API testing.
Features:
- It can be used for static and dynamic resource performance testing.
- It supports replaying test results.
- It can automatically work with CSV files. This helps the test team to produce unique parameter values for API tests.
- Price: Free to use
Pros
Cons
14) Apiary
Apiary allows monitoring the API during the design phase by capturing both request and response. It allows the user to write API blueprints and lets the user view them Apiary editor
Features:
- Role-based access control over API documents.
- It allows to add and remove team members from API design projects
- API Blueprint management dashboard
- Price: Lifetime free basic plan
Pros
Cons
15) API Science
API science allows monitoring the health, availability, and performance of web APIs. It is one of the best API testing tools that enables monitoring Private, Partner and Public APIs. This tool allows the user to know if any API ever goes down so that needed action should be taken to bring it back up.
Features:
- It is multi-step & Powered by JavaScript
- Powerful reporting mechanism helps to get insights into historical trends and spot future issues.
- Supports JSON, REST, XML, and Oauth
- Helps to manage API supply chain
- Price: Free to use
Pros
Cons
16) Apigee
Apigee is a cross-cloud API testing tool. It allows the user to measure and test API performance, supports and build API using other editors like Swagger. It offers security and governance policies across all APIs.
Features:
- Allows to design monitor, deploy, and scale APIs
- Easily create API proxies from the Open API Specification and deploy them in the cloud
- Identify performance issues by tracking API traffic, error rates, and response times
- Price: Lifetime free basic plan
Pros
Cons
17) Tricentis
Tricentis is a robust web services testing tool. Prominent API Testing features of Tricentis Tosca are –
Features:
- This web services test tool supports a wide array of protocols including HTTP(s) JMS, AMQP, Rabbit MQ, TIBCO EMS, SOAP, REST, IBM MQ,NET TCP
- It integrates into the Agile and DevOps Cycle
- It is one of the best API automation tools which uses model-based test automation that makes script maintenance easy.
- Enables end-to-end testing as API tests can be used across mobile, cross-browser, packaged apps, etc.
- Price: Lifetime free basic plan
Pros
Cons
FAQ
API Automation Tools & API Testing Framework
Name | Supported Platforms | Free Trial | Link |
---|---|---|---|
ReadyAPI | Cloud based | 14-day Free trial (No Credit Card Required) | Learn More |
BlazeMeter | Windows, Linux, MacOS | Lifetime free basic plan | Learn More |
Katalon Platform | Windows, Linux, MacOS | Lifetime Free Basic Plan | Learn More |
Postman | Windows, Linux, MacOS | 30-day Free trial | Learn More |
MicroFocus UFT One | Windows | Request a free quote from sales | Learn More |