FastAPI Backend Practice

A hands-on backend development repository focused on building scalable REST APIs using FastAPI, PostgreSQL, SQLAlchemy, Redis, JWT Authentication, and Alembic.

This repository contains practical implementations of core backend concepts including authentication, database migrations, caching, rate limiting, Pub/Sub messaging, and CRUD operations.

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Features

Authentication & Authorization

• User Registration
• User Login
• JWT Token Authentication
• Password Hashing with Passlib
• Protected Routes

Database Management

• PostgreSQL Integration
• SQLAlchemy ORM
• Alembic Database Migrations

API Development

• RESTful API Design
• CRUD Operations
• Request Validation with Pydantic
• Dependency Injection

Redis

• Redis Strings
• Hashes
• Lists
• TTL (Time To Live)
• Cache-Aside Pattern
• Redis Pub/Sub
• Persistence (RDB vs AOF)
• Eviction Policies (LRU)
• Login Rate Limiting
• API Response Caching

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Tech Stack

• FastAPI
• PostgreSQL
• SQLAlchemy
• Alembic
• Redis
• JWT Authentication
• Passlib
• Pydantic
• Docker
• Uvicorn

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Project Structure

FASTAPI/
├── alembic/
│   ├── versions/
│   ├── env.py
│   └── script.py.mako
│
├── FastAPI/
│   ├── routers/
│   │   ├── auth.py
│   │   ├── posts.py
│   │   └── students.py
│   │
│   ├── redis_practice/
│   │   ├── 01_strings.py
│   │   ├── 02_ttl.py
│   │   ├── 03_hashes.py
│   │   ├── 04_lists.py
│   │   ├── 05_caching_demo.py
│   │   ├── publisher.py
│   │   ├── subscriber.py
│   │   └── redis_client.py
│   │
│   ├── .env
│   ├── crud.py
│   ├── database.py
│   ├── hashing.py
│   ├── jwt_handler.py
│   ├── main.py
│   ├── models.py
│   └── schemas.py
│
├── .gitignore
├── alembic.ini
├── requirements.txt
└── README.md

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Getting Started

1. Clone the Repository

git clone https://github.com/<your-username>/fast_api_practice.git

cd fast_api_practice

2. Create and Activate Virtual Environment

Windows

python -m venv .venv

.venv\Scripts\activate

Linux / macOS

python3 -m venv .venv

source .venv/bin/activate

3. Install Dependencies

pip install -r requirements.txt

4. Configure Environment Variables

Create a .env file inside the FastAPI/ directory:

DATABASE_URL=your_postgresql_connection_string
SECRET_KEY=your_secret_key

5. Run Database Migrations

alembic upgrade head

6. Start Redis

docker run -d --name redis -p 6379:6379 redis

7. Run the Application

uvicorn FastAPI.main:app --reload

Open:

http://127.0.0.1:8000/docs

to access the interactive Swagger UI.

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Redis Practice Modules

Navigate to:

cd FastAPI/redis_practice

Run examples:

python 01_strings.py
python 02_ttl.py
python 03_hashes.py
python 04_lists.py
python 05_caching_demo.py

Pub/Sub example:

Terminal 1:

python subscriber.py

Terminal 2:

python publisher.py

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