Top 20 API Security Interview Questions and Answers | 20 Must-Know API Questions (With Answers!)

Are you preparing for an API Security interview? Whether you’re a fresher breaking into the industry or an experienced professional aiming for your next big role, this video by Topictrick is your complete guide to cracking API security questions confidently!

In this mock interview-style video, we dive deep into the Top 20 API Security Interview Questions and Answers, covering everything from basic principles like authentication and CORS, to complex topics such as Mutual TLS, replay attacks, and OWASP risks like BOLA.

Api Security Chapters:

00:00 – Intro: Why You Must Know API Security for Interviews
00:14 – What is API Security & Why It Matters
01:11 – Authentication vs Authorisation
01:37 – Common API Authentication Methods
02:10 – How OAuth 2.0 Works (Real-world Example)
02:38 – Role of API Gateway in Security
03:05 – Rate Limiting Explained
03:34 – Securing Sensitive Data in APIS
04:01 – CORS and Cross-Origin Protection
04:32 – Replay Attack and How to Prevent It
04:56 – How JWTS Secure API Access
05:24 – Open vs Internal vs Partner APIS
05:55 – Securing Third-Party Dependencies
06:18 – Injection Attacks and Input Validation
06:40 – Logging and Monitoring for API Security
07:06 – API Versioning and Risk Management
07:28 – Principle of Least Privilege
07:53 – Mutual TLS for Strong Authentication
08:15 – Preventing BOLA (Broken Object Level Authorisation)
08:40 – How to Test APIS for Security
09:09 – Balancing API Performance and Security
09:45 – Wrap-Up & Final Tips

🎯 What You’ll Learn:
How to explain API security to interviewers
The difference between authentication and authorization with examples
Real-world use cases of OAuth 2.0 and JWTs
How API Gateways enforce modern security standards
Techniques to prevent injection attacks and data leaks
How to secure internal, partner, and public APIs
Strategies to avoid common API vulnerabilities

Whether you’re appearing for a DevSecOps, Backend Developer, API Tester, or Solutions Architect role, this video arms you with must-know interview content that top companies like Google, Amazon, Infosys, and Deloitte are looking for.

👨‍💻 Who Should Watch:
Software Developers working with RESTful APIs
QA Engineers and Penetration Testers
Cloud and DevOps Engineers
Freshers applying for tech interviews
Professionals preparing for senior roles in API design or security

🔐 Why API Security Matters:
In a cloud-native, microservices-driven world, APIs expose critical data and business logic. Misconfigured or vulnerable APIs are now the #1 attack vector according to the OWASP API Security Top 10. So, companies are prioritizing secure-by-design APIs—making API security knowledge a top hiring priority.

📢 Pro Tip: Watch till the end to learn how to balance API performance and security—one of the most commonly asked advanced questions in technical interviews!

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