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API Security: A Complete Guide
Last Updated: January 10, 2026
Ashish Pratap Singh
24 min read
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API Security: A Complete Guide
1. Why APIs Are a Prime Target
2. The OWASP API Security Top 10
2.1 Broken Object Level Authorization (BOLA)
2.2 Broken Authentication
2.3 Broken Object Property Level Authorization...
2.4 Unrestricted Resource Consumption
2.5 Broken Function Level Authorization
2.6 Unrestricted Access to Sensitive Business Flow...
2.7 Server-Side Request Forgery (SSRF)
2.8 Security Misconfiguration
2.9 Improper Inventory Management
2.10 Unsafe Consumption of APIs
3. Authentication Strategies
3.1 API Keys
3.2 OAuth 2.0 and JWT
4. Authorization Strategies
4.1 Role-Based Access Control (RBAC)
4.2 Attribute-Based Access Control (ABAC)
4.3 Choosing Between RBAC and ABAC
5. Common Attack Vectors
5.1 Injection Attacks
5.2 Cross-Site Scripting (XSS) via API
5.3 Server-Side Request Forgery (SSRF)
5.4 Mass Assignment
6. Defense in Depth
6.1 Rate Limiting
6.2 Input Validation
6.3 Encryption
6.4 Security Headers
7. Logging and Monitoring
7.1 What to Log
7.2 Anomaly Detection
8. API Security Checklist
References
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Course Introduction
