Automatic API Attack Tool review
A focused free tool for Swagger 2.0 fuzzing, validation, and CI/CD checks.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Automatic API Attack Tool is a free, open-source command-line tool from Imperva for developers and organizations testing APIs defined by Swagger 2.0 specifications. It accepts JSON or YAML specifications, generates valid and invalid parameter values, sends requests to a target host, and checks responses against the API definition. Windows and Linux support, self-hosted deployment, and command-line execution make it suited to teams that want repeatable API checks in development or CI/CD workflows.
Its strongest area is focused request validation. Positive checks exercise generated valid parameters, while negative checks inject generated invalid values. Endpoint fuzzing targets parameters defined in the specification, and response-code validation identifies behavior that differs from the API contract. Proxy support extends testing to protected API paths. The tool can also generate TestNG results and bad-request output, which gives teams structured artifacts for review or pipeline handling. Authorization testing and input validation testing are included in its category coverage.
The trade-off is narrow scope. API discovery is not included, and the tool is centered on Swagger 2.0 rather than a wider range of API description formats. It also does not provide integrations or verified business-logic testing, so teams seeking broader security testing or ecosystem connectivity should choose a more expansive alternative. Automatic API Attack Tool is a practical fit for developers and security teams with defined Swagger APIs who need free, repeatable fuzzing and contract-oriented checks. It is less suitable for organizations starting without API specifications or looking for discovery-led, multi-format, business-logic, or integrated testing.
Automatic API Attack Tool pros and cons
- Where it wins
- Free, open-source command-line API testing
- Positive, negative, and endpoint fuzzing checks
- Proxy support and CI/CD-oriented execution
- Where it doesn't
- Supports Swagger 2.0 rather than broader API formats
- No API discovery capability
- No integrations or verified business-logic testing
Automatic API Attack Tool fact sheet, pricing and score →
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