Ace Your FastAPI interview in 2026. This video covers most common FastAPI interview questions and answers for freshers and experienced candidates. Learn about concepts like async def vs def, handling authentication, ASGI and WSGI, Pydantic, Dependency Injection and more. We cover best practices, including technical, architectural, and design pattern questions. We'll cover everything from basic to advanced and scenario-based questions to help you clear FastAPI interview.
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👉Below are the concepts we covered in this video on Top 20 FastAPI Interview Questions and Answers:
00:00:00 Introduction
00:00:11What is FastAPI Built on
00:00:55 𝗪𝗵𝗮𝘁'𝘀 𝘁𝗵𝗲 𝗱𝗶𝗳𝗳𝗲𝗿𝗲𝗻𝗰𝗲 𝗯𝗲𝘁𝘄𝗲𝗲𝗻 𝗮𝘀𝘆𝗻𝗰 𝗱𝗲𝗳 𝘃𝘀 𝗱𝗲𝗳?
00:01:47 𝗛𝗼𝘄 𝗱𝗼 𝘆𝗼𝘂 𝗵𝗮𝗻𝗱𝗹𝗲 𝗗𝗕 𝗰𝗼𝗻𝗻𝗲𝗰𝘁𝗶𝗼𝗻𝘀?
00:02:33 𝗛𝗼𝘄 𝗱𝗼𝗲𝘀 𝗙𝗮𝘀𝘁𝗔𝗣𝗜 𝘃𝗮𝗹𝗶𝗱𝗮𝘁𝗲 𝗶𝗻𝗽𝘂𝘁𝘀?
00:03:19 𝗛𝗼𝘄 𝗱𝗼 𝘆𝗼𝘂 𝗵𝗮𝗻𝗱𝗹𝗲 𝘀𝗹𝗼𝘄 𝗼𝗽𝗲𝗿𝗮𝘁𝗶𝗼𝗻𝘀?
00:04:07 How to handle authentication?
00:05:04 What is ASGI?
00:05:44 What is middleware in FastAPI, and how do you create a custom middleware?
00:06:59 What are the differences between ASGI and WSGI?
00:07:49 How do you design FastAPI microservices and handle inter-service communication?
00:08:59 What is Dependency Injection in FastAPI?
00:09:56 How do you implement application lifespan management (startup and shutdown events) in FastAPI?
00:10:59 Explain APIRouter.
00:11:48 What are Background Tasks in FastAPI and when should they be used?
00:12:14 What is the difference between @field_validator and @model_validator in Pydantic v2?
00:13:13 What are path and query parameters in FastAPI?
00:14:44 What is Pydantic, and why is it used?
00:15:30 How do you deploy a FastAPI application with Docker and Uvicorn/Gunicorn?
00:17:15 How would you perform database operations using SQLAlchemy?
00:18:37 How do you handle errors and exceptions in FastAPI?
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