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How to Test API Security with Claude

Test API security with Claude and ToolRouter. Find vulnerabilities in REST APIs.

Claude transforms penetration testing into a conversational security review where each discovered vulnerability leads to deeper investigation. Ask Claude to scan your application, explain each finding in context, chain additional targeted tests based on initial results, and generate remediation code for every issue found. Its analytical depth is ideal for security-conscious developers who want to understand not just what is vulnerable but why and how to fix it permanently.

Connect ToolRouter to Claude

1Go to Settings → Connectors → Add custom connector

2Enter the details below and click Add

Name

ToolRouter

URL

https://api.toolrouter.com/mcp

3Done — works on Claude chat, desktop, and mobile

Steps

Once connected (see setup above), use the Pentest tool:

Ask Claude: "Test the security of my API using pentest" and provide the base URL
Claude probes API endpoints for authentication, authorization, and injection vulnerabilities
Review findings organized by OWASP API Security Top 10 categories
Fix identified issues and re-test to verify remediation

Example Prompt

Try this with Claude using the Pentest tool

Test the security of my REST API at https://api.staging.myapp.com. Check authentication, authorization boundaries, rate limiting, and input validation.

Tips

Provide API documentation or an OpenAPI spec for more thorough testing
Ask Claude to test both authenticated and unauthenticated access patterns
Focus on endpoints that handle sensitive data or financial transactions first

More Claude Guides

How to Scan Web App Vulnerabilities with Claude How to Check SQL Injection with Claude How to Test XSS Exposure with Claude How to Scan Auth Weaknesses with Claude How to Test CORS Security with Claude

Related Workflows

Full Security AssessmentComprehensive security assessment combining infrastructure probing, vulnerability scanning, penetration testing, and CVE intelligence.Compliance Security AuditAudit systems against compliance frameworks using automated scanning, vulnerability checks, auth testing, and research.Web Application Security TestCrawl a web application, analyze HTTP security, test for injections, and document findings with screenshots.Network ReconnaissanceMap the complete network attack surface through DNS enumeration, geolocation, service probing, and attack vector analysis.API Security TestingTest API endpoints for authentication flaws, injection vulnerabilities, and compliance with OWASP API Security Top 10.Cloud Security AuditAudit cloud infrastructure by discovering assets, probing for misconfigurations, testing cloud-specific attacks, and checking CVEs.Third-Party Risk AssessmentAssess third-party vendor security through identity verification, external security probing, attack surface analysis, and breach history.