FastAPI From Scratch: Build a Complete E-Commerce REST API

Learn FastAPI from the ground up by building a complete, real-world e-commerce REST API with Python, PostgreSQL, SQLAlchemy, JWT authentication, Docker, and deployment.

This is a practical, project-based course. You will begin with the fundamentals of APIs and FastAPI, then gradually develop a structured e-commerce backend containing products, categories, users, authentication, shopping carts, orders, stock management, image uploads, and more.

Instead of learning disconnected concepts, you will see how each feature fits into a complete backend application.

What You Will Build

By the end of the course, you will have created a complete e-commerce REST API featuring:

• User registration and login

• Secure password hashing

• JWT authentication

• Protected API endpoints

• Admin and customer roles

• Role-based authorization

• Product and category management

• Product search, filtering, sorting, and pagination

• Shopping-cart management

• Order creation and order history

• Product stock management

• PostgreSQL database integration

• SQLAlchemy models and relationships

• Alembic database migrations

• Docker and Docker Compose configuration

• Interactive Swagger and ReDoc documentation

• Production deployment preparation

  
  

Your Step-by-Step Learning Journey

1. Understand Web and API Fundamentals

You will first understand how the web works, including HTTP requests, responses, methods, status codes, headers, JSON, APIs, and REST API principles. You will also learn how to test APIs using tools such as Postman or Insomnia.

2. Create Your First FastAPI Application

You will install FastAPI and Uvicorn, create your first application, run a development server, build API endpoints, return JSON responses, and explore automatic documentation using Swagger UI and ReDoc.

3. Work With Requests and Data Validation

You will learn how to use path parameters, query parameters, request bodies, response models, nested schemas, validation rules, optional values, and constraints using Pydantic.

4. Structure a Professional FastAPI Project

You will organize the application using routers, schemas, models, configuration files, environment variables, and dependency injection. This structure will make the project easier to maintain, test, and extend.

5. Connect FastAPI to PostgreSQL

You will connect the application to PostgreSQL using SQLAlchemy and Psycopg. You will create database models, manage sessions, implement CRUD operations, handle database errors, and build relationships between tables.

6. Manage Database Migrations

You will use Alembic to create, apply, update, and reverse database migrations safely as the application evolves.

7. Build the Product System

You will create products and categories, implement complete CRUD operations, and add practical features such as search, filtering, pagination, and sorting.

8. Add Authentication and Authorization

You will build user registration and login, hash passwords securely, generate and validate JWT access tokens, protect endpoints, retrieve the current user, and control access using admin and customer roles.

9. Develop Shopping Cart and Order Features

You will create cart and cart-item models, add products to a cart, update quantities, remove items, place orders, preserve product-price snapshots, manage order history, update order statuses, and control product stock.

10. Improve Security and Error Handling

You will handle HTTP and validation errors, create custom exception handlers, configure CORS, protect environment variables, understand SQL injection prevention, and learn about common API security mistakes.

11. Add File Uploads and Extra Features

You will implement product image uploads, validate uploaded files, serve static files, work with background tasks, and understand email-sending workflows.

12. Dockerize and Deploy the API

You will create a Dockerfile, configure Docker Compose, run FastAPI with PostgreSQL, manage production environment variables and migrations, inspect logs, and prepare the application for deployment.

What You Will Gain

After completing this course, you will be able to:

• Build modern REST APIs using Python and FastAPI

• Design maintainable backend project structures

• Validate request and response data with Pydantic

• Work confidently with PostgreSQL and SQLAlchemy

• Design relational database models

• Manage schema changes with Alembic

• Implement secure JWT authentication

• Create role-based authorization systems

• Develop real-world shopping-cart and order workflows

• Containerize backend applications with Docker

• Document and prepare APIs for production deployment

• Create a portfolio-ready backend project

  
  

Prerequisites

To follow this course, you should have:

• Basic knowledge of Python

• A willingness to code along and practice

You do not need previous experience with FastAPI, PostgreSQL, SQLAlchemy, Alembic, JWT. These technologies are introduced step by step throughout the course.

Start learning FastAPI today and build a complete e-commerce backend that demonstrates practical, job-ready Python API development skills.