Generate Test Cases for APIs — JSON Test Data Generator

Build negative tests, fuzz inputs and boundary value test cases for your JSON APIs — fast and automatically.

Paste your JSON and select a key to generate API edge cases, negative tests, fuzz inputs and boundary values.

Generated Test Cases

Generate test cases for API — automated negative and edge-case generation.
Custom Test Cases — tailor JSON test data for specific endpoints.
API fuzz testing tool guide — learn how to run fuzz tests and boundary value testing.

💻 REST API Testing

Generate request payloads and negative test cases tailored for REST API endpoints — required/optional fields, header variations, and expected status code checks.

🧪 QA Automation

Integrate generated JSON test data into CI pipelines and QA automation tools to run boundary value, regression, and fuzz tests automatically.

🧰 Postman Users

Export generated test cases to Postman collections or CSV for easy import by Postman users and manual testers.