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Building a RESTful To-Do API with Clean Architecture in Python

Building a RESTful To-Do API with Clean Architecture in Python APIs power modern apps, but without good structure they become tangled. In this tutorial, you’ll learn how to create a simple To-Do API in Python—organized with clean architecture patterns for maintainability and testability. Table of Contents What You’ll Build Why Clean Architecture? Project Structure Step 1: Define Entities Step 2: Use Cases (Business Logic) Step 3: Interface Adapters (Controllers & Repos) Step 4: Framework & Drivers (Flask) Step 5: Testing Next Steps What You’ll Build A minimal To-Do API with endpoints to: Create a task List all tasks Update a task’s status Delete a task All following clean architecture layers so code remains decoupled and easy to evolve. Why Clean Architecture? Clean architecture separates concerns into layers: Entities: Core business objects Use Cases: Business rules Interface Adapters: Convert data between layers Framework & Drivers: External tools (e.g., Flask) Benefits: Testable business logic Easier to swap frameworks or databases Clear dependency rule: outer layers depend on inner ones Project Structure

Apr 28, 2025 - 14:54
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Building a RESTful To-Do API with Clean Architecture in Python

Building a RESTful To-Do API with Clean Architecture in Python

APIs power modern apps, but without good structure they become tangled. In this tutorial, you’ll learn how to create a simple To-Do API in Python—organized with clean architecture patterns for maintainability and testability.

Table of Contents

  • What You’ll Build
  • Why Clean Architecture?
  • Project Structure
  • Step 1: Define Entities
  • Step 2: Use Cases (Business Logic)
  • Step 3: Interface Adapters (Controllers & Repos)
  • Step 4: Framework & Drivers (Flask)
  • Step 5: Testing
  • Next Steps

What You’ll Build

A minimal To-Do API with endpoints to:

  • Create a task
  • List all tasks
  • Update a task’s status
  • Delete a task

All following clean architecture layers so code remains decoupled and easy to evolve.

Why Clean Architecture?

Clean architecture separates concerns into layers:

  • Entities: Core business objects
  • Use Cases: Business rules
  • Interface Adapters: Convert data between layers
  • Framework & Drivers: External tools (e.g., Flask)

Benefits:

  • Testable business logic
  • Easier to swap frameworks or databases
  • Clear dependency rule: outer layers depend on inner ones

Project Structure
Read More

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