FastAPI

Founded by Sebastián Ramírez in 2018

Build high-performance web APIs in Python using standard type hints

Pricing model

Free

Rating

★ People love it

Time to value

Quick Setup (< 1 hour)

You can use FastAPI to build web APIs with Python based on standard type hints. It automatically validates incoming request data, converts formats to and from JSON, and generates interactive OpenAPI and Swagger documentation without extra configuration. The framework supports asynchronous code using async and await, background tasks, WebSockets, and dependency injection. It also offers built-in security features like CORS handling and OAuth2 integration, making it straightforward to build production-ready backend services and machine learning model endpoints.

What FastAPI does

Define HTTP route handlers for GET, POST, PUT, and DELETE operationsValidate incoming JSON request bodies against Pydantic modelsGenerate interactive documentation pages automaticallyExecute asynchronous database queries concurrentlyConfigure Cross-Origin Resource Sharing (CORS) rulesDispatch asynchronous background tasks following HTTP responsesTest API endpoints using built-in test client utilitiesAutomatic interactive API documentation with Swagger UI and ReDocData validation and type checking based on standard Python type hintsAsynchronous request handling with native async and await syntaxAutomatic conversion of request bodies and response data to and from JSONIntegrated dependency injection system for managing database sessions and securityBuilt-in support for WebSockets, background tasks, and Server-Sent EventsSeamless OpenAPI and JSON Schema standards compliance