FastAPI Basics

Master FastAPI fundamentals step-by-step. Build your first API with clear guidance, helpful hints, and immediate feedback. Perfect for beginners!

lessons: 45
level: beginner
time: 42 hours
price: free

Start with First Steps →

What you'll learn

Create a minimal FastAPI application
Understand the basic FastAPI structure
Create a simple path operation
Return JSON responses automatically
Understand what path parameters are and why they're useful
Create endpoints with dynamic URL paths
Use type hints for automatic validation
Handle different data types in path parameters
Understand what query parameters are and how they work
Create endpoints that accept optional query parameters
Set default values for query parameters
Use type hints for automatic query parameter validation

Lessons

Each lesson runs a real FastAPI server in the browser and grades your code against its own endpoints.

01
First Steps
Create your first FastAPI application following the official tutorial. Learn the simplest possible FastAPI file and understand the basic concepts.
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02
Path Parameters
Learn to create dynamic URLs that accept parameters. Build endpoints that can handle user IDs, product names, and other variable data in the URL path.
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03
Query Parameters
Learn to handle query parameters in URLs. Create flexible endpoints that accept optional parameters for filtering, pagination, and customization.
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04
Request Body
Learn to handle POST requests with data in the request body using Pydantic models. Create endpoints that can receive and validate complex data structures.
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05
Query Parameters and String Validations
Learn advanced query parameter features with validation, constraints, and metadata. Add length limits, regex patterns, and documentation to your query parameters.
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06
Path Parameters and Numeric Validations
Learn to add validation constraints to path parameters using Path(). Set numeric ranges, add documentation, and create robust path parameter validation.
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07
Body - Multiple Parameters
Master all aspects of FastAPI's Body - Multiple Parameters following the complete official tutorial. Learn to mix parameters, use multiple body params, singular values, and more.
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08
Body - Fields
Learn to add validation and metadata to Pydantic model fields using Field(). Master field-level constraints, descriptions, and advanced validation.
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09
Body - Nested Models
Master complex nested data structures with FastAPI and Pydantic. Learn to use lists, sets, nested models, and deeply nested structures for powerful APIs.
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10
Extra Data Types
Explore FastAPI's support for advanced Python data types including UUID, datetime, timedelta, bytes, Decimal, and more with automatic validation and conversion.
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11
Cookie Parameters
Learn to read and validate HTTP cookies in your FastAPI endpoints using the Cookie class.
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12
Header Parameters
Learn to read and validate HTTP headers using FastAPI's Header class. Handle common headers and custom X- headers.
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13
Query Parameter Models
Group related query parameters into a Pydantic model for cleaner code and better organization.
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14
Cookie Parameter Models
Group cookie parameters into Pydantic models for structured access to multiple cookies at once.
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15
Header Parameter Models
Group header parameters into Pydantic models for organized access to multiple headers at once.
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16
Response Model - Return Type
Learn to declare response models using return type annotations and the response_model parameter for data validation, documentation, and filtering.
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17
Extra Models
Learn to create multiple related models for different use cases, reduce code duplication through inheritance, and handle Union types for flexible responses.
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18
Response Status Code
Learn how to specify HTTP status codes for your API responses using the status_code parameter and FastAPI status constants.
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19
Request Forms
Learn how to receive form data instead of JSON using FastAPI's Form class for handling HTML form submissions.
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20
Request Files
Learn how to handle file uploads in FastAPI using File and UploadFile for receiving files from clients.
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21
Request Forms and Files
Learn to handle file uploads and form data together in a single request
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22
Request Form Models
Declare form fields as Pydantic models instead of individual Form() parameters for cleaner form handling.
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23
Handling Errors
Learn to handle errors gracefully in FastAPI using HTTPException and custom error handlers
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24
Path Operation Configuration
Learn to configure path operations with status codes, tags, descriptions, and metadata.
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25
Schema Extra - Examples
Provide example data for your API documentation using Pydantic model_config and OpenAPI examples.
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26
JSON Compatible Encoder
Learn to convert Pydantic models to JSON-compatible data for database storage using jsonable_encoder.
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27
Body - Updates
Learn how to update data using PUT for full replacement and PATCH for partial updates in FastAPI.
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28
Dependencies - First Steps
Learn FastAPI's dependency injection system to share logic and create reusable components.
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29
Classes as Dependencies
Learn how to use Python classes as dependencies for better type support and code organization.
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30
Dependencies - Sub-dependencies
Learn how to create dependencies that have sub-dependencies for arbitrarily deep dependency graphs.
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31
Dependencies - Path Operation Decorators
Learn how to add dependencies to path operation decorators without passing their return values to the function.
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32
Dependencies - Global Dependencies
Learn how to apply dependencies to all path operations in a FastAPI application globally.
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33
Dependencies with Yield
Learn to create dependencies that perform cleanup operations using yield for resource management.
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34
Security - First Steps
Implement basic OAuth2 security with FastAPI's OAuth2PasswordBearer class.
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35
Security - Get Current User
Learn how to create user models and dependencies to get the current authenticated user in FastAPI endpoints
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36
Security - Simple OAuth2
Implement OAuth2 password flow with form data authentication
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37
Security - OAuth2 with JWT Tokens
Implement secure authentication using JWT tokens with password hashing and OAuth2 Bearer authentication.
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38
Middleware Basics
Learn how to create and use middleware to process requests and responses in FastAPI applications.
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39
CORS Middleware
Learn how to handle Cross-Origin Resource Sharing in FastAPI with CORSMiddleware.
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40
SQL Databases with SQLModel
Learn to integrate SQL databases with FastAPI using SQLModel for data persistence and CRUD operations.
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41
Bigger Applications - Multiple Files
Learn to structure larger FastAPI applications using APIRouter, multiple files, and proper Python package organization.
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42
Background Tasks
Learn to run operations in the background after returning a response, perfect for tasks like sending emails or processing data.
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43
Metadata and Docs URLs
Learn to customize API metadata, documentation, and OpenAPI configuration for professional API presentation.
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44
Static Files
Learn to serve static files like HTML, CSS, and JavaScript using FastAPI's StaticFiles mount.
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45
Testing
Learn how to test FastAPI applications using TestClient for reliable and maintainable code.
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What you'll learn

Lessons

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