Enhancing API Testing with OpenAPI Schema Compliance in Katalon Studio

In the landscape of API development, strict adherence to established standards is crucial for sustaining consistency, ensuring reliability, and enabling seamless compatibility across evolving environments. With the release of Katalon Studio 9.7, we are excited to introduce OpenAPI schema compliance validation. This significant enhancement extends our schema compliance testing capabilities to include OpenAPI and Swagger specifications.
 

What is OpenAPI schema compliance validation?

Schema compliance testing is used to assert whether a request or a response follows the associated schema definition. Studio 8.4.0 introduced schema compliance testing for JSON, XML, and GraphQL schema. See Schema compliance testing in Katalon Studio.

OpenAPI schema compliance validation is a powerful feature that allows you to validate API requests and responses against the OpenAPI/Swagger specifications. This ensures that your API implementations are consistent with the agreed-upon contracts, which is essential for contract testing.

Why does OpenAPI compliance matter?

OpenAPI and Swagger have become the industry standard for defining and documenting APIs. 80% of respondents use OpenAPI as their API standard of choice. By supporting OpenAPI schema compliance, Katalon Studio aligns with industry trends and meets the growing demand from our users for robust API testing tools.

Key benefits

• Enhanced contract testing: OpenAPI schema compliance validation enables contract testing by verifying that APIs conform to the defined contracts. This is critical for ensuring API providers and consumers adhere to the expected format and behavior, reducing the risk of integration issues.
• Increased testing efficiency: By integrating OpenAPI schema compliance validation into Katalon Studio, users can conduct API tests more efficiently. This feature provides a unified environment for testing, eliminating the need for external tools and reducing the complexity of the testing process.
• Faster release cycles: Reliable API validation allows development teams to detect and fix issues early in the development cycle. This confidence in API quality can lead to quicker release cycles and improved time to market.
   

How to use OpenAPI schema compliance validation?

With the addition of new keywords and code snippets, integrating OpenAPI schema compliance into your testing workflow is straightforward:

• Validation in GUI/verification script: Users can now validate API requests and responses against OpenAPI/Swagger specifications directly within the Katalon Studio GUI or using verification scripts.
  
  Step 1. Add Swagger/OpenAPI Schema Type option for request/response under the Validation tab.
  
  
  
  
  Step 2. Add new code snippet: “Response body: Validate Swagger/OpenAPI against specification” to the Verification tab.
  
  

• New keywords: Utilize the WS.validateOpenAPIAgainstSpecification keyword to validate request and response objects against OpenAPI/Swagger specifications, ensuring your APIs are fully compliant.

Katalon Studio now supports Swagger 2.0, OAS 3.0.x, and 3.1.x, with future updates planned to expand this compatibility further.
 

Conclusion

The addition of OpenAPI schema compliance validation in Katalon Studio marks a significant step forward in our mission to provide a comprehensive, reliable, and user-friendly API testing solution. By incorporating this feature, you can enhance your API testing strategy, improve test accuracy, and accelerate your release cycles, all within a single, integrated platform.
 

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