API Security Testing

Identify API security flaws, risks and vulnerabilities

API Security Testing is enforced by the 42Crunch API Security Audit and API Conformance & Security Scan tools. For further runtime protection, API Protect can be added.

API Security Testing During API Design & Development

Because APIs are specified earliest in the SDLC and have a defined OpenAPI contract (via OpenAPI / Swagger) they are ideally suited to a preemptive “shift left” API security testing approach. 42Crunch's API Audit enables the testing of the OpenAPI contract and API Scan enables the testing of the underlying implementation of the API. Both are available in developer IDEs and CI/CD Platforms. Try some of our free API testing tools for developer and security teams.

Instant Scoring of the OpenAPI Contract

The 42Crunch API Security Audit automatically performs a static analysis of your OpenAPI (Swagger) definition file to ensure the definition adheres to the specification and to catch any security issues as per the OWASP API Security Top 10.

Audit Your OpenAPI Contract for OWASP API Top 10 Vulnerabilities

An API Audit report is auto-generated capturing API vulnerabilities in the OpenAPI contract such as mass assignment, data/exception leakage, weak authentication schemes, injection vulnerabilities and lack of resource control.

Dynamic Runtime Testing of your APIs

In addition to static testing, 42Crunch also offers dynamic testing of your API using API Scan. We simulate real API traffic with randomly generated requests and parameters to better test the API’s behavior under real-world conditions and its conformance to the already audited OpenAPI contract.

See How the API Scan Works

Check out our 6 min API Scan tutorial. The tutorial will show how to set up the API Scan, what it will check for and show the instant report that identifies the number of security issues in your API.

Frequently Asked Questions

What is API security testing?

API security testing is the process of identifying vulnerabilities, misconfigurations, and risks in APIs before they are deployed. It ensures APIs are protected against threats as categorized in the OWASP API Top 10 list, such as data leakage, broken authentication, and injection attacks.

Why is API security testing important?

API security testing is critical because APIs are a primary attack surface in modern applications. Without proper testing, insecure APIs can expose sensitive data and enable unauthorized access.

What types of vulnerabilities does API security testing detect?

API security testing detects vulnerabilities such as:

Broken authentication and authorization
Data exposure and leakage
Injection attacks
Misconfigured API endpoints
Lack of rate limiting

What is API Security Audit in 42Crunch?

42Crunch API Security Audit is a static analysis tool that evaluates OpenAPI (Swagger) definitions to identify security issues and ensure compliance with standards like the OWASP API Top 10.

What is API Scan in 42Crunch?

42Crunch API Scan is a dynamic testing tool that simulates real API traffic to detect vulnerabilities and validate that the API behaves according to its contract.

How does API security testing fit into DevSecOps?

API security testing integrates into CI/CD pipelines and developer workflows, enabling automated security checks throughout the software development lifecycle without slowing development.

What is shift-left API security testing?

Shift-left API security testing means identifying and fixing vulnerabilities early in the development lifecycle, starting from the API design stage using OpenAPI contracts.

Can API security testing be automated?

Yes, API security testing can be fully automated using tools integrated into IDEs and CI/CD pipelines, allowing continuous testing and enforcement of security policies.

How does OpenAPI improve API security testing?

OpenAPI enables automated security testing by providing a structured contract that defines how an API should behave, allowing tools to detect deviations and vulnerabilities.

How do APIs impact AI security?

APIs are the interface through which AI systems access data and services. Securing APIs ensures AI systems are protected from misuse, data leakage, and unauthorized actions.

How does 42Crunch secure AI-generated APIs?

42Crunch enforces authentication, authorization and security policies on APIs created and consumed by AI systems, helping prevent API-based attacks and misuse of AI agents.

When should API security testing be performed?

API security testing should be performed:

During design (OpenAPI audit)
During development (CI/CD testing)
During runtime (continuous monitoring)