Configuration management in FastAPI - Mini Project: Build & Apply

Configuration Management in FastAPI

📖 Scenario: You are building a simple FastAPI web application that needs to manage configuration settings like the app's title and debug mode. These settings should be easy to change in one place and used throughout the app.

🎯 Goal: Build a FastAPI app that loads configuration from a dictionary, uses a config variable to store settings, and applies these settings to the app instance.

📋 What You'll Learn

Create a dictionary called config_data with keys app_title and debug and exact values 'My FastAPI App' and True

Create a variable called config that stores the config_data dictionary

Create a FastAPI app instance called app using the title and debug values from config

Add a root path / that returns a JSON with the app's title from the config

💡 Why This Matters

🌍 Real World

Managing configuration in one place helps keep your FastAPI apps organized and easy to update, especially when deploying to different environments like development and production.

💼 Career

Understanding configuration management is essential for backend developers working with FastAPI or any web framework to build maintainable and scalable applications.

1

Create the configuration data dictionary

Create a dictionary called config_data with these exact entries: 'app_title': 'My FastAPI App' and 'debug': True.

FastAPI

# Create the config_data dictionary with app_title and debug
# Your code here

Need a hint?

Use curly braces {} to create a dictionary with the exact keys and values.

2

Create a config variable to hold the configuration

Create a variable called config and assign it the value of config_data.

FastAPI

config_data = {'app_title': 'My FastAPI App', 'debug': True}
# Assign config_data to config variable
# Your code here

Need a hint?

Simply assign the existing dictionary config_data to a new variable config.

3

Create the FastAPI app using config values

Import FastAPI from fastapi. Then create a FastAPI app instance called app using the title and debug values from the config variable.

FastAPI

config_data = {'app_title': 'My FastAPI App', 'debug': True}
config = config_data

# Import FastAPI and create app with title and debug from config
# Your code here

Need a hint?

Use FastAPI(title=..., debug=...) with values from the config dictionary.

4

Add a root path that returns the app title

Add a path operation for GET / using @app.get("/"). Define a function called read_root that returns a dictionary with the key app_title and the value from config['app_title'].

FastAPI

from fastapi import FastAPI

config_data = {'app_title': 'My FastAPI App', 'debug': True}
config = config_data

app = FastAPI(title=config['app_title'], debug=config['debug'])

# Add root path that returns app_title from config
# Your code here

Need a hint?

Use the @app.get("/") decorator and return a dictionary with the app title from config.