Learn FASTAPI with Real Code Examples

Built on Starlette for ASGI async capabilities

Request/response lifecycle hooks

Pydantic for data validation and serialization

Router-based modular structure

Supports background tasks and middleware integration

Client sends HTTP request -> FastAPI app

Dependencies and middleware process request

Route handler executes business logic

Pydantic models serialize response

Response sent back to client

Router-based modular structure

Type-hint and Pydantic-driven validation

Dependency injection for reusability

Async request handling for scalability

Middleware for cross-cutting concerns

RESTful APIs for web/mobile apps

Machine learning model serving APIs

Microservices backend

Authentication and authorization services

Event-driven or async data processing

Async-first for high performance

Type-hint driven automatic validation

Dependency injection for modularity

Automatic interactive documentation

Integration-friendly with Python ecosystem

Use async endpoints and background tasks

Deploy with Uvicorn/Gunicorn for concurrency

Cluster instances behind load balancer

Cache frequently accessed data

Modularize with routers and dependencies

Adapt from Flask or Django if needed

Rewrite route handlers using async/await

Replace Flask forms with Pydantic models

Use dependency injection for reusable logic

Test endpoints for validation and serialization