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OpenAPI Test Scenario Generator

Draft request examples and negative contract test scenarios from OpenAPI constraints, locally.

Paste or choose one OpenAPI 3.0, 3.1 or 3.2 file. Generate a minimal request example for each path operation and up to three negative cases based on documented required values, enums and simple bounds. Download a JSON scenario pack or Markdown checklist.

Turn an OpenAPI specification into reviewable request examples and negative test scenarios. Your specification stays in this browser.

Paste JSON or YAML below, or choose a file.

Up to 2 MB and 300 path operations. Supports OpenAPI 3.0, 3.1 and 3.2.

How to use

Draft API test scenarios from OpenAPI

Draft request examples and negative contract test scenarios from OpenAPI constraints, locally.

Step by step

  1. Provide the source using: OpenAPI specification.
  2. Choose: Generate scenarios. Inspect the result before copying, downloading or using it elsewhere.
  3. Paste or choose one OpenAPI 3.0, 3.1 or 3.2 file. Generate a minimal request example for each path operation and up to three negative cases based on documented required values, enums and simple bounds. Download a JSON scenario pack or Markdown checklist.

Choosing the settings

OptionWhat changes
Filter scenariosIt creates one minimal request example per path operation and up to three negative cases from documented required fields, parameters, enums and simple bounds. Declared response codes are shown as references, not guaranteed outcomes.
Generate scenariosDownload the JSON scenario pack for structured data or Markdown for a review checklist. Adapt every case to your API and run it only against a safe test environment. The tool does not execute requests.

Example and expected result

A POST /pets schema requires `name` and limits `age` to 0–30. The generator drafts one valid body, a case that omits `name`, and a case that uses an out-of-range age. These are review drafts: the tool never calls your API, does not add credentials, and cannot infer safe real identifiers or business rules.

If it is not working

  • Generated values cannot know valid account IDs, business rules, credentials or production-safe data. Complex schemas, external references, custom formats and patterns may need hand-written examples. No server URL or authentication secret is included.
  • If parsing fails, check JSON or YAML syntax before reviewing the API findings. Put needed local references in the same document. Unresolved external references and unsupported schema constructs require manual review; this tool does not fetch them or test a live server.

What does the generator create?

It creates one minimal request example per path operation and up to three negative cases from documented required fields, parameters, enums and simple bounds. Declared response codes are shown as references, not guaranteed outcomes.

What needs review?

Generated values cannot know valid account IDs, business rules, credentials or production-safe data. Complex schemas, external references, custom formats and patterns may need hand-written examples. No server URL or authentication secret is included.

How do I use the output?

Download the JSON scenario pack for structured data or Markdown for a review checklist. Adapt every case to your API and run it only against a safe test environment. The tool does not execute requests.

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