Python FastAPI Backend

FastAPI is a modern, fast (high-performance) web framework for building APIs with Python based on standard Python type hints.

It’s built on top of Starlette for web tooling and Pydantic for data validation. FastAPI is one of the fastest Python frameworks available, offering automatic interactive API documentation, data validation, serialization, and async support out of the box.

Automatic Docs: Interactive API Documentation

Based on OpenAPI and JSON Schema standards, FastAPI automatically generates interactive API documentation.

This allows you to explore your API endpoints directly in a browser, making it easier to understand and test.

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Response Models: Response Data Structure

FastAPI leverages dependency injection for managing complex logic within your application.

It also supports middleware for handling request and response processing, allowing you to add custom functionality at various stages of the API lifecycle.

Frequently asked questions

What is FastAPI?

FastAPI is a modern, high-performance web framework for building APIs with Python. It’s built on top of Starlette and Pydantic, offering features like automatic documentation generation, data validation, and asynchronous support.

How does FastAPI handle database interactions?

FastAPI supports various database options including SQLAlchemy (ORM), Tortoise ORM (async ORM), or even raw SQL. It encourages dependency injection for managing database connections and models, ensuring proper isolation and resource management.

Can I test my FastAPI application easily?

Yes! FastAPI provides a built-in `TestClient` class within the `fastapi.testclient` module. This allows you to simulate API requests directly from your code, making it simple to write and run tests without needing to start a full server.

What is OAuth2 support in FastAPI?

FastAPI provides built-in support for OAuth2 authentication. You can integrate with password-based OAuth2 flows, or utilize JWT (JSON Web Tokens) for more secure authentication and authorization.

How do I handle file uploads in FastAPI?

FastAPI offers the `UploadFile` class to easily handle file uploads. You can validate file types, sizes, and save them to disk or cloud storage, returning URLs for easy access.

▶ Try it live

Everything above runs in your browser — open Hash Function Avalanche Visualizer and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.

▶ Open Hash Function Avalanche Visualizer simulation