Learn Flask, Django, and FastAPI — their architecture, use cases, differences, and when to use which framework.
Flask is a micro web framework. It gives you only the essentials and lets you build everything your way.
from flask import Flask
app = Flask(__name__)
@app.route("/")
def home():
return "Hello Flask!"
app.run(debug=True)
Django is a full-stack web framework that follows the "batteries included" philosophy.
from django.http import HttpResponse
def home(request):
return HttpResponse("Hello Django")
FastAPI is a modern, high-performance API framework built for speed and scalability.
from fastapi import FastAPI
app = FastAPI()
@app.get("/")
def home():
return {"message": "Hello FastAPI"}
| Feature | Flask | Django | FastAPI |
|---|---|---|---|
| Type | Micro | Full-stack | API-focused |
| Speed | Medium | Medium | Very High |
| Learning Curve | Easy | Moderate | Easy–Moderate |
| Best For | Small apps | Large apps | APIs & ML |