What are the pros and cons of using OAuth 2.0 in API
Answer: uthentication? Pros: Secure delegated access. Widely adopted (Google, Facebook, GitHub). Works well for 3rd-party apps. Cons: Complex implementation. Requires token management. Overhead for small/simple APIs.
What interviewers expect
- A clear definition tied to REST API in ASP.NET Web API projects
- Trade-offs (performance, maintainability, security, cost)
- When you would and would not use it in production
Real-world example
In a production ASP.NET Web API application, teams apply this when handling user-facing features or integration boundaries. For example, you might use it during a sprint where reliability and observability matter—logging metrics, validating edge cases, and documenting the decision in an ADR so future developers understand why the approach was chosen.
How to explain in the interview
- Define the concept in one or two sentences.
- Context — where it fits in ASP.NET Web API architecture.
- Example — a specific project, bug, or performance win.
- Trade-off — what you gain vs what you sacrifice.
Tip: Practice aloud on Toolliyo mock interview or the Interview Q&A section before your real interview.