Build a Simple API from Scratch 💻 FastAPI Tutorial for Beginner

Description

What if APIs are not confusing at all - they were just never explained simply enough? 🤯 In this beginner-friendly FastAPI tutorial, we’ll build a simple API from scratch with Python — using a fun real-world example of delivering goods from New Jersey to New York! 🚚🍅 By the end of this tutorial, you’ll not only understand what APIs are, but you’ll also design, develop, and run one yourself - complete with custom endpoints, async requests, error handling, and even a beautiful client app that brings your API to life! No boring backends, no overwhelming syntax! Just the simplest introduction you’ve ever seen. 😎 ⭐ This video is brought to you by HubSpot! Check out their FREE Introduction to Python PDF guide: https://clickhubspot.com/f057c8 Big thanks to HubSpot for sponsoring this video and providing the Python guide for free! 🙌 📚 What you'll learn: - What APIs are and how they work (explained with trucks, bridges & tomatoes!) - How to build an API server with FastAPI - Creating endpoints and path parameters - Handling multiple requests (async functions) - Using query parameters (`?order_qty=30`) - Updating inventory dynamically - Error handling & best practices with FastAPI - Running and testing your API with Uvicorn - Connecting to a custom-built client app 🛠️ Tools used: - Conda / WSL - FastAPI - Uvicorn - Custom FastAPI client app 🔎 Resources & Helpful Tutorials: -------------------------------------------- ⭐ Full code on GitHub: https://github.com/MariyaSha/Simple_API_Example ⭐ Free Python Introduction PDF (HubSpot): https://clickhubspot.com/f057c8 ⭐ Install WSL and Conda: https://youtu.be/luM5kwH6tjQ 💻 Environment Setup: ----------------------------------------------------------------------------------------------- conda create -n api_env python=3.12 conda activate api_env pip install fastapi uvicorn # Run API server : uvicorn nj_server:app --reload # Run my custom client: pip install requests jinja2 python-multipart uvicorn ny_client:app --reload --port 8001 ⚙️ Example Endpoint: ----------------------------------------------------------------------------------------------- @app.get("/warehouse/{my_item}") async def load_truck(my_item, order_qty): return { "item": my_item, "order_qty": order_qty, "unit": catalog[my_item]["unit"] } ----------------------------------------------------------------------------------------------- ⏰ Timestamps ⏰ 01:22 - What is an API? (Explained with trucks & bridges) 03:35 - Coding an API Server with FastAPI 06:02 - Creating Endpoints 08:10 - Async Functions 08:42 - Path Parameters 09:45 - Running the API Server with Uvicorn 13:17 - Custom Client App 16:15 - Updating Inventory Dynamically 19:03 - Error Handling in FastAPI 20:15 - Best Practices & Next Steps 21:26 - Thanks for Watching! :) #python #api #programming #coding #pythonprogramming #pythontutorial #backend #webdevelopment #beginnerfriendly #server #client