Testing for Vulnerabilities & Rate Limiting
Basic Security Checks in Postman
| Check | What It Reveals |
|---|---|
| Missing authentication enforcement | Endpoints that respond without valid credentials |
| Verbose error messages | Sensitive details leaking in error responses |
| Insecure headers | Missing security headers like CORS or CSP settings |
Testing Rate Limiting
Sending repeated requests quickly (via the Collection Runner with many iterations and no delay) can confirm whether an API correctly returns a 429 Too Many Requests once a limit is exceeded.
Writing Assertions for Security
Tests can assert that unauthorized requests are rejected, that sensitive fields aren't present in responses, or that rate-limit headers like X-RateLimit-Remaining behave as expected.
Scope and Limitations
Postman is useful for functional-level security checks, but it isn't a replacement for dedicated penetration testing tools when deeper vulnerability scanning is required.
Security testing protects an existing API - next, let's shift to building something from scratch: a full mock API with Postman.
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