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APIs (Application Programming Interfaces) are the backbone of modern digital services, enabling seamless communication between systems. Understanding key API terms is crucial for cybersecurity, development, and IT operations. Below are the 12 essential API terms explained, along with practical commands and security best practices.
🔄 REST (Representational State Transfer)
A lightweight architecture using HTTP methods (GET, POST, PUT, DELETE).
You Should Know:
Test REST API with cURL
curl -X GET https://api.example.com/users
curl -X POST -H "Content-Type: application/json" -d '{"user":"admin"}' https://api.example.com/login
📝 SOAP (Simple Object Access Protocol)
An XML-based protocol with strict security.
You Should Know:
Send SOAP request curl -X POST -H "Content-Type: text/xml" -d @request.xml https://api.example.com/soap-endpoint
📊 JSON (JavaScript Object Notation)
A lightweight data format for APIs.
You Should Know:
Parse JSON in Linux
echo '{"name":"John"}' | jq '.name'
🔑 OAuth (Open Authorization)
Securely grants third-party access without sharing passwords.
You Should Know:
Generate OAuth token curl -X POST -H "Authorization: Basic base64(client:secret)" -d "grant_type=client_credentials" https://oauth.example.com/token
⏱️ Rate Limiting
Prevents API abuse by limiting requests.
You Should Know:
Check rate limits via headers curl -I https://api.example.com | grep "X-RateLimit-Limit"
🧩 API Key
Unique authentication code for API access.
You Should Know:
Secure API key storage (Linux) echo "export API_KEY='your_key'" >> ~/.bashrc source ~/.bashrc
💬 Webhook
Real-time event notifications via HTTP callbacks.
You Should Know:
Simulate a webhook locally
ngrok http 8080
curl -X POST -d '{"event":"payment_success"}' http://localhost:8080/webhook
🔍 GraphQL
Allows flexible data queries.
You Should Know:
Query GraphQL API
curl -X POST -H "Content-Type: application/json" -d '{"query":"{users{name}}"}' https://api.example.com/graphql
🛡️ API Gateway
Manages API traffic and security.
You Should Know:
Check API Gateway logs (AWS CLI) aws apigateway get-rest-apis
🔓 CORS (Cross-Origin Resource Sharing)
Controls domain access to APIs.
You Should Know:
Test CORS headers curl -I -X OPTIONS https://api.example.com -H "Origin: http://test.com"
🔐 Token-Based Authentication
Uses temporary tokens instead of passwords.
You Should Know:
Decode JWT token
echo "eyJhbGciOiJ..." | jq -R 'split(".") | .[bash] | @base64d | fromjson'
📈 Why It Matters?
APIs power cloud services, payments, and automation. Securing them prevents breaches and ensures performance.
What Undercode Say
APIs are critical but often exploited. Use these commands to test, secure, and monitor APIs:
Scan for API vulnerabilities (OWASP ZAP) docker run -it owasp/zap2docker zap-api-scan.py -t https://api.example.com -f openapi
Check API security headers curl -I https://api.example.com | grep -E "Strict-Transport-Security|X-Content-Type-Options"
Windows API testing (PowerShell) Invoke-RestMethod -Uri "https://api.example.com/users" -Method Get
Expected Output:
{ "status": "secure", "headers": { "X-RateLimit-Limit": "1000" } }
Prediction:
API attacks will rise in 2024—focus on zero-trust authentication and AI-driven anomaly detection.
Relevant URLs:
References:
Reported By: Chiraggoswami23 Api – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
