Both are popular Python web tools. Flask is a microframework—minimal core, you add extensions. Django is full-stack with opinions and integrated components.
When Django fits well
- CRUD apps, internal tools, content sites, and multi-app projects
- Teams wanting admin, ORM, and auth without shopping for libraries
- Projects where conventions speed onboarding
When Flask (or FastAPI) fits well
- Small APIs or services where you want minimal framework overhead
- Microservices with custom stack choices per service
- Learning HTTP from scratch before adopting Django conventions
Important interview questions and answers
- Q: Can Django do APIs only?
A: Yes—Django REST Framework (DRF) builds JSON APIs; many teams use Django admin plus a React SPA. - Q: Is Flask always faster?
A: Not necessarily—performance depends on queries, caching, and deployment; both can scale with proper architecture. - Q: Can you use Flask and Django together?
A: Unusual in one process—typically pick one framework per service in a larger system.
Self-check
- Give one reason to choose Django over Flask for a new admin-heavy app.
- Give one reason Flask might win for a tiny JSON microservice.
Interview prep
- When pick Django over Flask?
CRUD-heavy apps, internal tools, teams wanting conventions, admin, and integrated ORM—Flask wins for minimal microservices where you choose every piece.