Flask interview question · Most asked
When would you choose Flask over FastAPI or Django?
Summary
Choose Flask for server-rendered or mixed apps where you want a small, flexible core and a mature ecosystem; FastAPI for typed, async-first JSON APIs with automatic OpenAPI; Django when you want an integrated ORM, admin, auth and conventions.
Longer Answer
Flask shines for small-to-medium apps, internal tools, prototypes and teams that want to choose components. Its sync model is simple and works well with most libraries. FastAPI is better for high-concurrency I/O APIs; Django for content-heavy or admin-heavy products.
Key Points
- Flask: flexible, mature, sync-first
- FastAPI: typed async APIs
- Django: batteries included
- Choose by team and domain
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