Skeleton Flask Generator
Fast, accurate and free online skeleton flask generator tool running directly in your browser.
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2Click the button
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3Get the result
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Other tools you may find usefulFlask framework generator - Python boilerplate without configuration from scratch
Flask is a minimalist Python web framework - flexible and unstructured, which means that each project starts differently. The tool generates a coherent, professional Flask project structure based on selected components: database, authorization, tests and deployment.
Available project configurations
Application mode: REST API (JSON endpoints) or Web App (Jinja2 templates + forms). Database: SQLAlchemy + SQLite (dev), PostgreSQL or MySQL. Migrations: Flask-Migrate (Alembic). Auth: Flask-Login (session) or JWT (flask-jwt-extended). Validation: Marshmallow or WTForms. Cache: Flask-Caching (Redis/Memcached).
Directory structure of the project
app/__init__.py (Application Factory). app/models.py – SQLAlchemy models. app/routes/ – Blueprints (router modules). app/schemas.py – Marshmallow schemas (validation + serialization). app/config.py – per-environment configuration. tests/ – pytest fixtures + testclient. requirements.txt + .env.example + Dockerfile.
Application Factory pattern
Instead of global app = Flask(__name__): def create_app(config): app = Flask(__name__); app.config.from_object(config); db.init_app(app); returnapp. Benefits: multiple application instances (tests), free import of models without circular imports, easy configuration switching (dev/test/prod).
Testing with pytest and Flask-Testing
Flask testclient: app.test_client(). Fixture: @pytest.fixture def client(): app = create_app("testing"); yield app.test_client(). Request: client.get("/api/users"). Assert: response.status_code == 200. Factory Boy: generating test objects. Coverage: pytest --cov=app --cov-report=html.
Frequently asked questions
Flask or FastAPI – what to choose in 2024?
Flask: larger ecosystem, mature extensions (Flask-Admin, Flask-SQLAlchemy), great for web app + API, easier for beginners. FastAPI: Automatic OpenAPI documentation, Pydantic validation, async/await natively, faster (ASGI). Choice: Flask for CRUD and web applications, FastAPI for pure API with high traffic.
How to manage environments (dev/prod) in Flask?
python-dotenv + .env file. Class Config: class DevelopmentConfig: DEBUG=True; class ProductionConfig: DEBUG=False. create_app(os.getenv("FLASK_ENV","development")). Sensitive variables (SECRET_KEY, DATABASE_URL): always with env, never in code.
How to deploy Flask to production?
Gunicorn: gunicorn -w 4 -b 0.0.0.0:8000 "app:create_app()". Nginx as reverse proxy (upstream to Gunicorn). Supervisor or systemd: auto-restart on failure. Docker: FROM python:3.12-slim + pip install + CMD gunicorn. Heroku/Railway: Procfile: web: gunicorn app:create_app().
What are Blueprints and when to use them?
Blueprint is a module that groups related routes, templates, static files. Example: auth_bp = Blueprint("auth", __name__, url_prefix="/auth"). When to use: application > 5-10 routers, different functional areas (auth, admin, api, blog). Blueprints are not modules - they can import models from app/.
How to add CORS to Flask API?
pip install flask-cors. from flask_cors import CORS. CORS(app, origins=["https://frontend.com"]). For all origins (dev): CORS(app). Per-route: @cross_origin(). Preflight OPTIONS: handled automatically. Credentials: CORS(app, supports_credentials=True).
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