Why FastAPI exists - See It in Action

Why FastAPI Exists

📖 Scenario: You are building a simple web API to share information about a bookstore. You want to understand why FastAPI is a good choice for this task.

🎯 Goal: Create a basic FastAPI app that shows how FastAPI helps build APIs quickly and clearly.

📋 What You'll Learn

Create a FastAPI app instance named app

Add a configuration variable title with the value 'Bookstore API'

Define a GET endpoint at / that returns a welcome message using the title variable

Include metadata in the FastAPI app to explain why FastAPI exists

💡 Why This Matters

🌍 Real World

FastAPI is used to build fast and easy web APIs for real-world applications like online stores, data services, and more.

💼 Career

Knowing FastAPI helps you create modern APIs quickly, a valuable skill for backend developers and API engineers.

1

Create the FastAPI app instance

Import FastAPI from fastapi and create an app instance called app.

FastAPI

from fastapi import FastAPI

# Create the FastAPI app instance
# Your code here

Need a hint?

Use FastAPI() to create the app instance.

2

Add a configuration variable for the API title

Create a variable called title and set it to the string 'Bookstore API'.

FastAPI

from fastapi import FastAPI

app = FastAPI()

# Add a title variable
# Your code here

Need a hint?

Use a simple string variable named title.

3

Define a GET endpoint that returns a welcome message

Use @app.get("/") to create a function called read_root that returns a dictionary with the key message and the value Welcome to {title}! using an f-string.

FastAPI

from fastapi import FastAPI

app = FastAPI()

title = 'Bookstore API'

# Define a GET endpoint at '/' that returns a welcome message
# Your code here

Need a hint?

Use the decorator @app.get("/") and return a dictionary with the welcome message.

4

Add metadata explaining why FastAPI exists

Modify the app creation to include the title parameter set to title variable and add a description parameter with the text 'FastAPI exists to make building APIs fast, easy, and reliable.'.

FastAPI

from fastapi import FastAPI

# Modify app creation to add title and description
app = FastAPI()

title = 'Bookstore API'

@app.get("/")
def read_root():
    return {"message": f"Welcome to {title}!"}

Need a hint?

Pass title=title and description='FastAPI exists to make building APIs fast, easy, and reliable.' to FastAPI().