About API Contract Tester
This tool sends HTTP requests and validates whether responses satisfy expected API contracts, with auth options and basic stress testing.
Key Features
- Request Builder: Configure method, URL, headers, and body.
- Auth Support: Bearer, Basic, API Key, and OAuth2 modes.
- Response Viewer: Inspect status, latency, headers, and body.
- Contract Validation: Validate fields, types, and structure rules.
- Stress Test: Run lightweight concurrency/duration checks.
Steps
- Configure request method, URL, headers, and body.
- Set authentication parameters if needed.
- Send request and inspect response details.
- Define contract rules and run validation.
- Optionally run stress test for stability signals.
Use Cases
- API integration validation during development.
- Contract consistency checks in regression.
- Pre-release smoke performance checks.
FAQ
Why do I get CORS or request errors?
Browser requests are limited by CORS and network policies. Ensure the target service allows your origin.
How should I write contract rules?
Start with critical checks: status code, required fields, and data types, then add business constraints.