> For the complete documentation index, see [llms.txt](https://sahil-3.gitbook.io/fast-api/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sahil-3.gitbook.io/fast-api/fast-api.md).

# Fast API

#### 1. **Introduction**

* What is FastAPI?
* Why use FastAPI?
* Key features (e.g., speed, async support, automatic docs)

#### 2. **Setup and Installation**

* System requirements
* How to install FastAPI and Uvicorn
* Setting up a virtual environment

#### 3. **First FastAPI App**

* Create your first endpoint
* Run the server using Uvicorn
* Use `/docs` and `/redoc` for API documentation

#### 4. **Core Concepts**

* Path parameters and query parameters
* Request and response models using **Pydantic**
* Dependency injection
* Background tasks

#### 5. **Validation and Pydantic Models**

* Define input models
* Automatic validation
* Nested models and field types

#### 6. **Authentication and Authorization**

* OAuth2 with Password (JWT tokens)
* Using `Depends()`
* Security utilities

#### 7. **Database Integration**

* Connecting with SQL (using SQLAlchemy)
* Using async databases (Tortoise ORM or databases library)
* CRUD operations example

#### 8. **Handling Files and Forms**

* Uploading files
* Sending forms
* Response handling

#### 9. **Testing FastAPI Applications**

* Using `pytest`
* Test client example
* Testing routes and dependencies

#### 10. **Project Structure Best Practices**

* How to organize larger apps
* Folder layout (routers, services, models, etc.)
* Using `APIRouter`

#### 11. **Advanced Topics**

* Middleware
* CORS
* Background tasks
* WebSockets
* Async/Await explained

#### 12. **Documentation and Swagger**

* Auto-generated docs
* Customizing the OpenAPI schema
* Adding descriptions, examples

***

####  13. **Deployment**

* Deploy with Uvicorn + Gunicorn
* Dockerize your FastAPI app
* Hosting (Render, Deta, Heroku, etc.)

#### 14. **FAQs / Troubleshooting**

* Common errors and how to fix
* Debugging tips

**15.Conclusion / Resources**