Schemathesis
Schemathesis is an open-source tool that generates and executes property-based tests for web APIs from API schemas such as OpenAPI definitions.
Secure APIs
Schemathesis is an open-source API testing tool that generates property-based tests from API schemas.
- How it is used
- Tests live API implementations against schemas through automated contract testing and fuzzing.
- How deep it goes
- Generates malformed cases and checks responses, but stops short of testing business-layer behavior.
- Examples
- Exercises course endpoints and student registration, including malformed NUL-byte input that triggers a database error.
- What you can do after
- Apply it via Schemathesis to discover API drift, malformed-input failures, schema violations, and authentication weaknesses.
Automating API Delivery
Schemathesis is an open-source tool that generates and executes property-based tests for web APIs from API schemas such as OpenAPI definitions.
- How it is used
- Generates and runs schema-conformance tests against external or public APIs from their published definitions.
- How deep it goes
- Walks through CLI execution, data generation, request recording, documented examples, and interpretation of failures and summaries.
- Examples
- Uses a Product Catalog API, an OpenAPI YAML definition, a CLI command, a cassette, and response-schema failure output.
- What you can do after
- Diagnose API schema defects and automate happy- and sad-path conformance checks with the Schemathesis CLI.
Related concepts
- OpenAPI specificationuses · The OpenAPI Specification is a standard, machine-readable format for describing HTTP APIs, including their operations, inputs, outputs, data structures, and security requirements.
- property-based testingkind of · Property-based testing is a software-testing technique that generates varied inputs and checks whether specified general properties of the software’s behavior hold across them.
- fuzzingkind of · Fuzzing is an automated testing technique that supplies varied, malformed, unexpected, or mutated inputs to software to reveal failures, vulnerabilities, or other defects.
- implementationuses · An implementation is the concrete code, mechanisms, or artifacts that realize an abstract design, specification, algorithm, interface, or required behavior.
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