10 Top API Testing Tools in 2024
We have covered both the free tools and the paid tools in the API testing category. The top 10 best performing API Testing tools to consider for 2024 are:
HyperTest is the only API testing platform that is truly no-code. It regresses all your APIs by auto-generating integration tests using your network traffic without asking teams to write a single line of code. It also gives a way to reproduce these failures inside actual user-journeys.
Backed up by dev teams from Nykaa, Porter, Yellow.ai, Urban Company etc, HyperTest makes it impossible for devs to introduce a breaking change that is not reported back to QA teams. It tests a user-flow, across the sequence of steps an actual user will take in using the application via its API calls. It detects every issue during testing in less than 10 mins, that other written tests would definitely miss.
1.1 Key Features:
End to end backend testing
Test Queues/Async flows and contracts for 3rd Party APIs
Compatible to test GraphQL, gRPC & REST APIs
Automatic Test case Design
Automatic test case maintenance
Self healing API tests i.e. Auto-Updation
API coverage Reports built within
Integration with any CI/CD tool like Jenkins, Circle CI, GitLab etc
Automatic documentation of APIs and schemas
Performance testing of APIs
Pricing: Free for one service; Followed by flexible paid plans
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Postman is an API development environment which is divided into three parts – Collections, Workspaces, and Built-in Tools. Postman collections enable you to execute requests, conduct testing and debugging, automate tests, create mocks, document, and monitor APIs. It will also allow you to share the collections, set permissions, and manage participation in multiple workspaces.
2.1. Key Features:
Although it requires some coding effort, it anyways helps in automated testing
Assists in exploratory testing
It is compatible with Swagger and RAML (RESTful API Modeling Language) formats.
It supports knowledge sharing within the team
Run, test, document, and monitoring features
Free Version Restrictions: Limited to basic API testing purposes.
Suitable for tasks like validating API responses, status codes, and contracts.
Performance Testing: Not equipped for performance testing.
Lacks necessary insights and metrics for performance analysis.
Code Reusability: Postman test scripts are challenging to repurpose.
Pricing: Starting from $12/month
Katalon Studio is an automation tool for API, Web, Desktop testing and Mobile testing. It offers straightforward deployment by consolidating all frameworks, ALM integrations, and plugins into a single package. The capability of combining UI and API/Web services for multiple environments (Windows, Mac OS, and Linux) is also a unique advantage of Katalon Studio among the top API tools.
3.1. Key Features:
Endorses REST, SOAP requests, and SSL client certificates
Incorporates AssertJ support for crafting fluent assertions in BDD style
Facilitates test import from Swagger (2.0 & 3.0), Postman, WSDL, and WADL
Enables API test data setup through UI testing
Applicable for both automated and exploratory testing
Free Version Limitations: Katalon operates as a proprietary tool with restricted features in its free version.
Limited Community Assistance: Due to a smaller user base, community support for Katalon is relatively limited.
Finding solutions for intricate scenarios can be challenging.
Absence of Scripting Language Support: Katalon lacks support for various scripting languages.
Pricing: Free and Flexible paid plans available
4.1. Key Features:
Facilitates monitoring, implementation, and extension of API designs
Identifies performance issues through the tracking of API traffic, error rates, and response times
Streamlines the creation of an API proxy based on open API specifications, deployable in the cloud
Apigee requires a significant amount of resources, leading to a high initial expense for deploying it on-premises.
Employing a container-based approach could streamline the installation and deployment process.
Pricing: Free and paid plans available
JMeter is a freely available software designed for load and performance testing of applications. Operating on a cross-platform basis and functioning at the protocol layer, it serves as a versatile tool for developers. Notably, JMeter can be employed as a unit-test tool for JDBC database connection testing. With a plugin-based architecture, it facilitates the generation of test data and supports a Command-line mode, particularly beneficial for Java-compatible operating systems.
5.1. Key Features:
Enable caching and offline playback of test results
Seamless integration with CSV files, allowing the team to swiftly generate unique parameter values for API tests
Integration of API tests into the CI pipeline facilitated through JMeter and Jenkins
Applicable for performance testing of both static and dynamic resources
User Interface Experience: JMeter's user interface is often reported as not being user-friendly, causing challenges during test script execution.
Memory Utilization: JMeter tends to use a significant amount of memory, leading to frequent performance issues when compared to alternative API automation tools.
Scripting Complexity: JMeter's scripting process for API testing is more intricate in comparison to other available API testing tools.
6. Rest Assured
REST Assured is a freely available, open-source Java library utilized for the testing and validation of RESTful APIs. It stands out for its user-friendly approach in Java settings, making it a popular option among developers and testers dealing with REST services.
6.1. Key Features:
Accommodates all the main HTTP methods like GET, POST, PUT, DELETE, facilitating interactions with a variety of API endpoints.
REST Assured enables predefined configurations for requests, including base URI, headers, query parameters, and authentication, which can be reused in various tests.
It offers the capability to examine various elements of API responses, such as status codes, headers, the body of the response, and timing.
Comes with inbuilt capabilities for managing JSON and XML responses, which are prevalent in today’s APIs.
Limited Support for SOAP APIs: Does not specifically cater to the testing of SOAP (Simple Object Access Protocol) APIs.
Java Proficiency Required: To use REST Assured effectively, a solid understanding of Java programming is necessary.
7. Karate DSL
Karate DSL, an open-source API testing framework, utilizes Behavior Driven Development (BDD) and Gherkin syntax for API test automation. This approach, distinct from other BDD tools like JBehave or Cucumber, provides pre-defined step definitions, enabling easy test creation, even for those with minimal coding experience.
7.1. Key Features:
It is beginner-friendly as it requires minimal coding experience.
Integrates with the Gatling framework for performance checks.
Features multi-thread parallel execution.
Unique Scripting Language: May require learning new scripting syntax.
Limited IDE Support: Absence of IntelliSense support in integrated development environments.
Challenges in Error Troubleshooting: Identifying code errors can be complex
Pricing: Starts at $64/month
SoapUI, a prominent API testing solution, is favored by many businesses for its ability to adhere to specific protocols and functionality needs. It supports a wide range of features and is compatible with REST and SOAP APIs. SoapUI specializes in API performance, security testing, and mocking, ensuring efficient and secure API operations.
8.1. Key Features:
Evaluates API stability under high user loads.
It provides insightful metrics analysis for easy decision-making.
Generates test simulations and analyzes performance data.
Includes checks for SQL injection and cross-site scripting.
Mimics API service behaviors for thorough testing
Occasional Stability Issues: Some users report stability concerns, leading to crashes or erratic behavior during tests.
Steep Learning Curve: The interface and features can be challenging for beginners in API testing.
Reliance on WSDL for Web Services: SoapUI depends on Web Services Description Language (WSDL) for web service testing, which can be a limitation if WSDL files are not well-defined or available
Pricing: Available for free trial and then a yearly license purchase of $659
BlazeMeter is an advanced API testing tool that offers a range of features to streamline and optimize the testing process. It's designed to cater to various testing needs, from performance testing to API monitoring and functional testing.
9.1. Key Features:
Comprehensive testing tools on a single platform.
AI-driven test data generation for improved accuracy.
Easy integration with IDEs.
World-class device lab for extensive functional testing.
Robust API testing and monitoring features.
Pricing may be higher for smaller teams or startups.
Steep learning curve: To effectively analyze BlazeMeter reports, users need to have a good understanding of the tool and its data.
Pricing: Free plan, followed by Pro and Contract-based plan.
10. Rest Console
This Chrome-based REST/HTTP Client tool is designed for users to easily design and test custom HTTP requests with any RESTful API service.
10.1. Key Features:
Users can easily craft POST or PUT bodies with raw input.
It features a user-friendly interface for modifying custom headers.
The tool simplifies the process of creating query parameters.
It's versatile for various authentication methods including Plain, Basic, and OAuth.
The latest version, Rest Console v4.0.2, includes numerous updates for an improved user experience and bug fixes, such as enhanced oAuth functionality, collapsible sections, clickable links in responses, and UI improvements.
User interface is somewhat outdated and has limited accessibility.
Still in the early stages of development.
The Only Tool You Need to Test Your APIs
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While these are some really great tools, HyperTest is the only API testing platform that requires no code. Moreover, it guarantees over 95% coverage of your application in less than 5 minutes. Its unique approach to API regression discovers every API error for developers before release.
If you’re building a software, you need to use HyperTest, it is by far the best API testing tool.
Learn about how HyperTest helped a FinTech App serving over half a million users to catch every critical bug before production.
Schedule a demo to understand how it can also help you to ship out bug-free products in minutes.