OWASP API Security Testing Framework review

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

OWASP API Security Testing Framework (ASTF) is an open-source command-line tool for automated API security testing. It is designed for developers, security testers, and teams adding API checks to CI/CD workflows. ASTF discovers API endpoints through OpenAPI/Swagger probing and common path patterns, then assesses risks across all 10 OWASP API Security Top 10 categories. Its coverage includes authentication, authorization, input validation, GraphQL, gRPC, and several focused vulnerability checks.

The framework’s strongest technical depth is in security test coverage. It can test cross-user authorization with two authenticated identities and supports bearer tokens, API keys, Basic authentication, mutual TLS, and custom headers. Checks include SQL and NoSQL injection, JWT, SSRF, rate limiting, and ReDoS. This gives teams a broad starting point for automated API assessment, while report generation in HTML, JSON, SARIF, and XML supports both review workflows and security tooling.

ASTF is self-hosted and integrates with GitHub Actions, making it a fit for teams comfortable managing command-line security tooling inside their own environments. The open-source model avoids a paid plan structure, but convenience depends on the team’s deployment and pipeline setup. ASTF is less suitable when testing depends on multi-step business logic flows or importing an OpenAPI/Swagger specification directly, since business-logic testing is not included and specification import is listed in the roadmap. Choose it for open-source OWASP API Top 10 coverage with varied authentication and protocol support; consider another tool for deeper workflow testing or a managed platform.

OWASP API Security Testing Framework pros and cons

• Where it wins
  • Tests all 10 OWASP API Security Top 10 categories
  • Supports GraphQL, gRPC, JWT, SSRF, injection, and rate-limit checks
  • Generates HTML, JSON, SARIF, and XML reports
• Where it doesn't
  • Self-hosted deployment requires teams to manage the runtime
  • Business-logic flow testing is not included
  • OpenAPI/Swagger specification import is planned, not completed

OWASP API Security Testing Framework fact sheet, pricing and score →

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Last updated 7 Oct 2026 · How we research and update