
Modern, high-performance Python web framework for building APIs with standard Python type hints.
FastAPI is a modern, high-performance web framework for building APIs with Python 3.8+ based on standard Python type hints. In the 2026 landscape, it remains the gold standard for AI-driven backends due to its native support for asynchronous programming (ASGI) and seamless integration with Pydantic for data validation. Architecturally, FastAPI sits atop Starlette for web parts and Pydantic for data parts, achieving performance speeds comparable to Node.js and Go. Its unique selling proposition is the automatic generation of interactive OpenAPI (Swagger) and ReDoc documentation, which significantly reduces developer friction. By 2026, the ecosystem has matured to include robust support for Pydantic V2 and tight coupling with machine learning libraries like PyTorch and TensorFlow, making it the preferred choice for deploying LLMs and real-time inference engines. Its dependency injection system allows for modular, testable code, while its security utilities provide out-of-the-box support for OAuth2, JWT, and CORS, catering to enterprise-grade security requirements.
Uses Pydantic's Rust-based core for data serialization and validation, ensuring type safety with near-native performance.
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Generates OpenAPI 3.1.0 schemas dynamically, rendering Swagger UI and ReDoc interfaces by default.
A hierarchical dependency injection framework for managing database sessions, authentication, and logic reuse.
Built on Starlette, it handles concurrent requests using Python's asyncio without blocking threads.
Integrated tools for OAuth2 (with Password flow and scopes), JWT tokens, and HTTP Basic auth.
First-class support for bidirectional, persistent connections.
Allows developers to intercept requests and responses for logging, CORS, or custom headers.
Hosting machine learning models (LLMs) with high concurrency and low overhead.
Registry Updated:2/7/2026
Return structured JSON predictions.
Streaming live analytics to a frontend interface without polling.
Building a scalable network of services that communicate via JSON.