What is the importance of API testing and tools like Postman or Swagger?

• Ensures correctness, reliability, performance, and security of APIs.
• Postman → Manual and automated API testing, environment variables, collections.
• Swagger (OpenAPI) → Live documentation, mock servers, auto-generated client

SDKs.

• Automates QA process and reduces bugs in production.

🔹 API Scalability & Performance – Interview Q&A