Spectral
Spectral Spectral is the fast OpenAPI/Swagger linter that validates specs against rulesets for structural flaws or security gaps like missing auth in endpoints. Run its CLI on YAML/JSON files for quick audits, customizing rules for custom policies in API design reviews. Open-source from Stoplight, it's the spec scrutinizer for devs templating compliant APIs from the start.
Explore →Prance
Prance Prance is the Python validator for OpenAPI specs, parsing YAML/JSON for conformance to Swagger 2.0 or 3.0 with CLI tools for error reporting in API discovery phases. Integrate its lib into scripts for automated checks, resolving references for full validation. Open-source from jfinkels, it's the conformance checker for pentesters verifying spec integrity before fuzzing.
Explore →Autoswagger
Autoswagger Autoswagger discovers exposed OpenAPI/Swagger docs via fuzzing common paths, then tests for auth bypasses or hidden endpoints in API recon. Run its Python script with --brute for aggressive scans, outputting valid specs for further analysis. Open-source from intruder-io, it's the doc detective for auditors unearthing undocumented APIs.
Explore →openapi-spec-validator
OpenAPI Spec Validator openapi-spec-validator enforces OpenAPI 3.0 compliance on YAML/JSON, flagging schema errors or missing fields for clean spec discovery and testing. Use its Python CLI on files for detailed reports, integrating into CI for gated merges. Open-source from pytest-dev, it's the schema sheriff for API crafters templating valid docs.
Explore →zaproxy-openapi-addon
ZAP OpenAPI Addon zaproxy-openapi-addon imports Swagger/OpenAPI specs into OWASP ZAP for automated scanning of endpoints, fuzzing params for vulns like injections in API audits. Install via ZAP marketplace, load specs, and run active scans for reports. Open-source from OWASP, it's the spec scanner for pentesters templating dynamic API tests.
Explore →restler-fuzzer
RESTler Fuzzer restler-fuzzer generates test cases from OpenAPI specs for stateful fuzzing, probing fields for crashes or leaks in backend logic discovery. Build from .NET source, infer grammars from schemas, and run sessions for repros. Open-source from Microsoft, it's the spec slammer for researchers stressing APIs with derived payloads.
Explore →openapi-all-in-one
OpenAPI All-in-One openapi-all-in-one is the VS Code extension for spec validation, linting, and generation, checking Swagger files for errors during API design and discovery. Install via marketplace, open YAML/JSON, and run diagnostics for fixes. Open-source from 42Crunch, it's the IDE inspector for devs templating secure specs in editors.
Explore →schemathesis
Schemathesis schemathesis is the property-based fuzzer for OpenAPI specs, generating edge-case inputs for fields to test validation or parser bugs in API discovery. Install via pip, point at spec URLs, and run for crash reports with coverage. Open-source from karta, it's the schema shredder for pentesters fuzzing APIs against their own blueprints.
Explore →swagger-parser
Swagger Parser swagger-parser is the Java lib for loading and validating Swagger 2.0/OpenAPI 3.0 specs, resolving refs for complete models in API recon or testing setups. Import for programmatic parses, dumping JSON for analysis. Open-source from swagger-api, it's the spec synthesizer for devs rebuilding API structures from fragments.
Explore →openapi3-parser