Schemathesis tests OpenAPI and GraphQL APIs by generating inputs from your schema, adapting to server responses, and chaining operations into realistic workflows.

uvx schemathesis run https://example.schemathesis.io/openapi.json

• 💥 500 errors that crash your API on edge case inputs
• 📋 Schema violations where your API returns different data than documented
• 🚪 Validation bypasses where invalid data gets accepted
• 🔗 Integration failures when responses don't match client expectations
• 🔄 Stateful bugs where operations work individually but fail in realistic workflows

• 🧪 Schemathesis - the CLI and pytest plugin
• 🚀 GitHub Action - run Schemathesis in CI
• 🎯 TraceCov - keyword-level coverage of your API schema
• 🔬 Live Benchmarks - hour-long runs against Apache Airflow, Open WebUI, Prefect and more

- uses: schemathesis/action@v3
  with:
    schema: "https://your-api.com/openapi.json"

📚 Documentation | 💬 Discord