OpenAPI Test Generator for Katalon Studio

What does this plugin do?

• Parses any OpenAPI/Swagger JSON specification and generates a complete Katalon Studio test suite from it — Web Service Request objects and API Test Cases, one per endpoint.
• Replaces hours of manual object creation, parameter wiring, and verification scripting with a guided wizard that runs in minutes.
• Groups generated objects and test cases by tag, mirroring the structure of your specification.

Core Workflow

• Import & Validate — browse to your OpenAPI/Swagger JSON file; the plugin parses and validates it immediately.
• Server URL & Authentication — automatically detected from your specification (server URL pre-filled, authentication type pre-selected as No Auth, Basic Auth, or Bearer Token), with the option to review or override any value.
• Choose Test Case Type — select any combination of Basic API Test Case, Parameter Validation, and Schema Validation.
• Generate — live progress feedback as objects and test cases are created, followed by a summary of everything generated.

Features and Capabilities

• Automatic object and test case generation, one per API operation, organized by tag/folder.
• Smart defaults for server URL and authentication scheme, reducing manual configuration.
• Centralized Server URL management — the server URL, whether detected from your specification or entered manually, is always stored in a single Katalon Global Variable and referenced by every generated Web Service Request; no request ever hardcodes a URL.
• Environment switching without regeneration — because every request reads the server URL from a Global Variable, moving between Dev, QA, UAT, and Production is just a matter of switching Katalon Execution Profiles.
• Flexible URL input — accepts a server URL with or without a trailing slash (https://host or https://host/); both forms resolve identically, so generated requests never end up with a malformed double-slash path.
• Independently configurable validation depth — toggle parameter validation and response schema validation per generation run.
• Secure credential handling — credentials and tokens are stored as protected Katalon Global Variables, never hardcoded into test scripts.
• Clear, self-narrating generated test scripts — each step (parameter checks, request/response logging, status code verification, schema validation) logs its own pass/fail evidence.
• Full $ref resolution — nested and shared schema components are resolved during parsing, so modular specifications are handled correctly.
• Stable regeneration — object and test case identifiers are derived deterministically from their own paths, so re-running the wizard after a spec update doesn't create noisy, unrelated changes.
• Non-blocking validation — a spec that fails to validate doesn't trap you; you can still proceed, with a definitive error only if generation itself can't complete.
• No external scripting runtime required — the generation engine is implemented entirely in Java, running natively within Katalon's plugin architecture.

Who Is It For?

• QA engineers and SDETs working with REST APIs who want a baseline of automated API tests directly from existing OpenAPI documentation.
• Teams onboarding a new service, keeping tests in sync as an API evolves, or bootstrapping test coverage for an API that has none yet.

How to Install This Plugin from the Store

• Open Katalon Studio and go to the Store tab (or Profile → Katalon Store, depending on your version).
• Search for "OpenAPI Test Generator".
• Click Install on the plugin listing and accept any permission prompts.
• Restart Katalon Studio once installation completes — plugin installs only take effect after a full restart.
• After restarting, open any Katalon project and look for the OpenAPI Test Generator icon on the toolbar to launch the wizard.