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API testing is a critical aspect of modern software development, ensuring seamless communication between systems. Below is a detailed breakdown of key concepts, tools, and practical commands to master API testing.
Common HTTP Status Codes
- 200 OK: Request succeeded.
- 400 Bad Request: Invalid client input.
- 401 Unauthorized: Missing/invalid credentials.
- 403 Forbidden: Access denied.
- 404 Not Found: Resource unavailable.
- 500 Internal Server Error: Server failure.
Types of API Testing
1. Functional Testing: Validates API behavior.
2. Load Testing: Measures performance under traffic.
3. Security Testing: Identifies vulnerabilities.
4. Integration Testing: Ensures compatibility.
5. Regression Testing: Confirms updates don’t break functionality.
HTTP Methods
GET: Retrieve data.POST: Create data.PUT: Update entire resource.DELETE: Remove resource.PATCH: Partial updates.
API Testing Tools
- Postman: GUI-based API testing.
- SoapUI: SOAP & REST testing.
- JMeter: Load/performance testing.
- RestAssured: Java-based testing.
- curl: Command-line tool for API requests.
You Should Know: Practical API Testing Commands & Codes
1. curl Commands for API Testing
GET Request
curl -X GET https://api.example.com/users
POST Request (JSON)
curl -X POST -H "Content-Type: application/json" -d '{"name":"John"}' https://api.example.com/users
DELETE Request
curl -X DELETE https://api.example.com/users/1
Authentication (Bearer Token)
curl -H "Authorization: Bearer YOUR_TOKEN" https://api.example.com/protected
2. Automated API Testing with Python (Requests Library)
import requests
GET Request
response = requests.get("https://api.example.com/users")
print(response.status_code, response.json())
POST Request
payload = {"name": "Alice"}
response = requests.post("https://api.example.com/users", json=payload)
print(response.status_code)
Handling Errors
try:
response = requests.get("https://api.example.com/invalid")
response.raise_for_status()
except requests.exceptions.HTTPError as err:
print(f"Error: {err}")
3. JMeter Load Testing (CLI)
Run JMeter Test Non-GUI Mode jmeter -n -t test_plan.jmx -l results.jtl Generate HTML Report jmeter -g results.jtl -o report/
4. Security Testing with OWASP ZAP
Run ZAP Baseline Scan docker run -t owasp/zap2docker-stable zap-baseline.py -t https://api.example.com
5. Postman Newman (CLI Runner)
Run Postman Collection newman run collection.json --environment env.json
What Undercode Say
API testing is non-negotiable for robust software. Key takeaways:
– Use `curl` for quick manual checks.
– Automate with Python (requests) or Postman.
– Load test with JMeter.
– Secure APIs with OWASP ZAP.
– Monitor logs (journalctl -u your_api_service).
Expected Output:
- A well-tested API with 95%+ uptime.
- Automated regression suites.
- Security-hardened endpoints.
Prediction
API testing will evolve with AI-driven anomaly detection, reducing manual efforts by 40% by 2026.
Relevant URLs:
References:
Reported By: Ashsau Api – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
