Learn FASTAPI-REST with Real Code Examples

FastAPI uses Python type hints for request validation, parsing, and documentation.

Supports asynchronous programming with async/await for high concurrency.

Automatically generates OpenAPI and JSON Schema documentation.

Integrates easily with Pydantic for data validation and serialization.

Optimized for both developer productivity and high-performance applications.

Routing and path operations

Request/response validation via Pydantic models

Dependency injection for modular services

Asynchronous support with async functions

Interactive API documentation (Swagger, Redoc)

Path Operation - endpoint definition (GET, POST, etc.)

Request Model - Pydantic model for input validation

Response Model - Pydantic model for output validation

Dependency - reusable function or service injection

Middleware - pre/post processing of requests

main.py - main application entry

routers/ - separate route modules

models/ - Pydantic and ORM models

services/ - business logic and DB access

requirements.txt - dependencies

Define path operations for each endpoint

Create Pydantic models for request and response

Implement async functions for business logic

Add dependencies for services like DB connections

Run and test API with Uvicorn server

Beginner: simple CRUD API

Intermediate: API with async database operations

Advanced: OAuth2 authentication, JWT, and dependencies

Expert: Microservices with async workflows

Enterprise: High-concurrency production APIs

FastAPI vs Flask: FastAPI async, type-safe, auto-docs; Flask simpler and synchronous

FastAPI vs Django REST Framework: FastAPI faster, async-friendly; DRF more feature-rich

FastAPI vs Tornado: FastAPI easier with auto validation; Tornado older async framework

FastAPI vs Express.js: FastAPI Python type hints, async; Express JS ecosystem

FastAPI vs Node.js frameworks: FastAPI better type validation and auto docs; Node.js mature ecosystem

2018 - Initial release by Sebastián Ramírez

2019 - Added async support and Pydantic integration

2020 - Swagger/OpenAPI auto-docs stabilized

2021 - Async background tasks and improved dependencies

2025 - Latest FastAPI version with modern async ecosystem support

Path Operation - endpoint definition

Request Model - Pydantic model for input

Response Model - Pydantic model for output

Dependency - injectable function/service

Middleware - request/response pre/post-processing