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5 must-know API testing types every developer should use
these core types cover about 90% of real-world issues:
Smoke Testing - “does it even work?”
a quick check to confirm the API is alive and responding
- where to test: Postman / Hoppscotch
Functional Testing - “does it return the right data?”
send a request and compare the actual response with the expected result
- where to test: Postman / Jest / Pytest
Integration Testing - “do the components work together?”
test the full flow: frontend, API, and database interacting as one system
- where to test: Postman / Pytest / Supertest
Security Testing - “is it protected against attacks?”
look for vulnerabilities: unauthorized access, SQL injections, exposed endpoints
- where to test: OWASP ZAP / Burp Suite
Load Testing - “how much traffic can it handle?”
simulate 1,000+ users at the same time and see where performance starts to break
- where to test: k6 / Apache JMeter
If your API isn't tested across all 5 - it's not ready for production, it just hasn't failed yet