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Backend
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FastAPI
Backend
FastAPI
Curated FastAPI interview questions with detailed answers.
30
questions
updated weekly
Junior
10
Middle
12
Senior
8
FastAPI questions
30 / 30 shown
Default
Popular
Newest
›
What is FastAPI and why is it popular?
Junior
#Framework
#Fastapi
Details →
›
How do you define routes (path operations)?
Junior
#Framework
#Fastapi
Details →
›
How do path and query parameters work?
Junior
#Framework
#Fastapi
Details →
›
What are Pydantic models in FastAPI?
Junior
#Validation
#Fastapi
Details →
›
How do you receive a JSON request body?
Junior
#Framework
#Fastapi
Details →
›
What is response_model for?
Junior
#Framework
#Fastapi
Details →
›
How does FastAPI generate automatic documentation?
Junior
#Framework
#Fastapi
Details →
›
When should you use async def vs def for endpoints?
Junior
#Async
#Fastapi
Details →
›
How do you set status codes and headers?
Junior
#Framework
#Fastapi
Details →
›
How do you add validation constraints to parameters?
Junior
#Validation
#Fastapi
Details →
›
How does dependency injection (Depends) work?
Middle
#Di
#Fastapi
Details →
›
How do you write custom validation in Pydantic?
Middle
#Validation
#Fastapi
Details →
›
How do you handle errors and raise HTTP exceptions?
Middle
#Error Handling
#Fastapi
Details →
›
How does middleware work in FastAPI?
Middle
#Framework
#Fastapi
Details →
›
How do BackgroundTasks work?
Middle
#Framework
#Fastapi
Details →
›
How do you structure a large app with APIRouter?
Middle
#Framework
#Fastapi
Details →
›
How do you handle form data and file uploads?
Middle
#Framework
#Fastapi
Details →
›
How do you integrate a SQL database with FastAPI?
Middle
#Data
#Fastapi
Details →
›
How do you manage settings with Pydantic?
Middle
#Framework
#Fastapi
Details →
›
How do you implement authentication (OAuth2/JWT)?
Senior
#Security
Details →
›
Why is FastAPI fast, and how do you keep it that way?
Senior
#Performance
Details →
›
How do you test FastAPI applications?
Senior
#Testing
Details →
›
How do you handle WebSockets in FastAPI?
Senior
#Framework
#Fastapi
Details →
›
How do you run robust background jobs (Celery/ARQ)?
Senior
#Architecture
#Fastapi
Details →
›
How do you deploy a FastAPI app to production?
Senior
#Architecture
#Fastapi
Details →
›
How do you configure CORS in FastAPI?
Middle
#Security
Details →
›
How do you model nested and complex request bodies?
Middle
#Validation
#Fastapi
Details →
›
What response types can you return beyond JSON?
Middle
#Framework
#Fastapi
Details →
›
What advanced dependency patterns does FastAPI support?
Senior
#Di
#Fastapi
Details →
›
What changed in Pydantic v2 and why does it matter for FastAPI?
Senior
#Validation
#Fastapi
Details →
