Python web development has two dominant frameworks: FastAPI for modern APIs and Django for full-stack applications. Here is a detailed comparison to guide your choice.

Performance Benchmarks

• FastAPI: ~15,000 requests/second (async)
• Django: ~3,000 requests/second (sync), ~8,000 with ASGI

FastAPI is built on Starlette and uses async/await natively, giving it a significant performance advantage for I/O-bound workloads.

FastAPI: Modern API Development

from fastapi import FastAPI, HTTPException, Depends
from pydantic import BaseModel, EmailStr
from typing import Optional

app = FastAPI()

class UserCreate(BaseModel):
    name: str
    email: EmailStr
    age: Optional[int] = None

class UserResponse(BaseModel):
    id: int
    name: str
    email: str

@app.post("/users", response_model=UserResponse, status_code=201)
async def create_user(user: UserCreate):
    db_user = await save_to_db(user)
    return db_user

@app.get("/users/{user_id}")
async def get_user(user_id: int):
    user = await get_from_db(user_id)
    if not user:
        raise HTTPException(status_code=404, detail="User not found")
    return user

Django: Full-Stack Power

# models.py
from django.db import models

class User(models.Model):
    name = models.CharField(max_length=100)
    email = models.EmailField(unique=True)
    created_at = models.DateTimeField(auto_now_add=True)

# views.py
from rest_framework import viewsets
from .models import User
from .serializers import UserSerializer

class UserViewSet(viewsets.ModelViewSet):
    queryset = User.objects.all()
    serializer_class = UserSerializer

Feature Comparison

• Auto Documentation: FastAPI has built-in Swagger UI; Django needs DRF + drf-spectacular
• ORM: Django has a powerful built-in ORM; FastAPI uses SQLAlchemy or Tortoise
• Admin Panel: Django admin is legendary; FastAPI needs SQLAdmin or custom solution
• Authentication: Django has built-in auth; FastAPI uses fastapi-users or custom
• Type Safety: FastAPI is fully typed with Pydantic; Django is catching up

When to Choose FastAPI

• Building microservices or APIs
• High-performance async requirements
• ML model serving
• WebSocket applications
• Type-safety is a priority

When to Choose Django

• Full-stack web applications
• Content management systems
• Admin-heavy applications
• Rapid prototyping with batteries included
• Teams familiar with Django ecosystem

The Hybrid Approach

Many teams use both: Django for the main application with admin, and FastAPI microservices for performance-critical APIs.

Conclusion

FastAPI is the future of Python API development. Django remains unbeatable for full-stack applications. Choose based on your project requirements, not hype.